The restriction in the DR's exhaust is actually in the header pipe. The weld that attaches the flange to the pipe is HUGE and restricts the inside diameter of the stock pipe. Grinding that weld down on the inside of the pipe is the no-cost fix.
The restriction that ticks me off is the joint between the head pipe and the intermediate pipe… Buy a big tube header, buy a performance exhaust….and it’s all still choked by the necked down factory joint…
thanks for this video, you are absolutely correct when you say there is not much info about this conversion. i have spent this summer modding my airbox, exhaust, and air filter, and cannot for the life of me seem to get the fuel mix correct with the jet kit in my '12 dr. i went with the JD jetting kit, put in two different main jets, used just about all the slots on the needle and still get some hesitation to the point where i am considering dyno-tuning at the local motorcycle shop to finally get it out of my amateur hands for the tune of $300. on a whim i called procycle and they said that that is just the nature of the stock vacuum carby, and the only real fix is to go pumper. i am leaning in that direction now because the difference is (about) 100 bucks more and seems more guaranteed than the dyno-tune which may not even fix the issue. i also like that they take into account your existing mods and jet the carby before they even send it to you, although it seems like they kinda missed the mark with yours. great drone footy!
Good video very informative, thinking of doing some work on my 2010 DR rather than spending money on a KTM! This mod is high on my want list. Pretty much confirmed what I was hoping, better throttle response and smoother engine operation.
I bought a 2005 DR650 that had been stored for 10 years. This upgrade made sense to me since I waa gonna be doing much cleaning to the carb on the bike (it had been stored with gas in it). The 450 was a bit steep IMO but any time I start to question my judgement I just take the bike for a ride and amazes again at the power delivery. The pump makes all the difderence in the world IMO.
The TM40 upgrade was the best thing I ever did to my 2009 DR hands down. I put a lot of work into that bike....suspension, exhaust, Bars, tank, and seat......and the TM 40 was the winner.Sadly....I sold that 09 and bought a quad. Now I'm starting over with my 2015 DR.....the TM 40 carb is tops on the list.
Im thinking of buying one and convert it to a supermoto because I dont want to spend 14 000$ on a ktm 500exc im looking for something reliable with enough speed for highway riding do you think dr650 is a good bike for that?
Procycle kit. Hayabusa exhaust, big tube header, 15/43. Carb is worth every penny. I don’t think it makes anymore peak power but it is massively more drivable in the low to mid range. Economy, without being overly OCD about it seems the same. It was bolt on plug and play, not the continual tweaking trying to find the best setup like on the factory BST. I wouldn’t say it was the best modification to the DR (gas tank), doesn’t even make my top 5 (tank/seat/tires/skid plate/springs), but it does make my top ten - so far (ergo’s(bars &pegs)/luggage/dustbin shield/ mirror extenders/TM40). Good video, thanks.
Hi John, Nice video, I have a 2017 DR650 with a TM40. I bought the carb off Ebay and jetted it. What jetting are you running and what needle position? Just heard your running a 155. I live near Frederick MD. and PA line. I've been tweaking the jetting to minimize the backfire on decel and still retain the punch. I'd agree on the street it's not much different except at slow speeds where it is much smoother and pulls without lugging. I did the same mod on my DR350. Can't stand the CV carbs, it's kinda like turbo on a car. Too much lag. I ride Michaux frequently. Where in MD are you?
Mine was popping after I installed the pumper carburetor and i had it set the way they told me to and one day i raised the needle. I lowered the clip one notch and wow. Hufe difference. And I have the GSX-R muffler and mid pipe and then I chenged the front and rear springs and the smaller front spocket. And Dunlop knobby tires. I like it
I did the fcr-mx 39 and loved it however they cost alot of money used and the slide/carb body wears if your doing alot of miles. I sold it for a drz250 as its better on single track. If i get another 650 im doing a new tm40
Should be the number 1 mod first. Maybe except for a good sounding exhaust. CV carbs wait for engine vacuum to lift the carb slide. Hesitation. Pumper carb slides lift with the twist of the throttle. No hesitation. Totally different ways to put down power
Great video! I have the TM40 also, plus the hi-comp piston, and the 223 cam. If you have the money, know-how, and time to do the project, it is well worth it. The carb by itself, like you said, is an improvement, mainly because of the greatly improved throttle response and smoothness at lower Rpm's, giving the bike a much wider spread of power.
Trevor Jameson I have the exact same mods that you have I actually bought a 790 kit from procycle so I should be getting that put in very soon hopefully it's worth it
Excellent, it's great to hear from someone who is going to try the 790 kit. Please let me know how it works out for you after you get it installed and going, it would be really cool to hear about it.
The header pipe is the MAIN restriction in the DR. Adding just a pipe does nothing. No need to replace the header pipe, but if you take it off, you will see the header flange is welded to the pipe on the inside. Sometimes the weld is so thick, there is literally more than a half inch of diameter that is blocking airflow. Take the pipe off, weld the flange on the outside, then grind all the weld out of the inside. I have seen this one mod add 3rwhp on the dyno.
i have it on my big bore klr650 (685cc) but even though the difference is huge between this and the stock cvk40, the tm42 bogs at wide open throttle and i just dont know what to do to fix it :(
Dang. The carb/exhaust is all stock on my DR650,it doesnt bog,it doesnt surge while cruising,it doesnt shudder and gets great mileage and works clear up to 10,000 elevation. What happened? Why me? 50,000 miles on it runs great,plug is a nice tan color.
What jet kit did you use? Currently have a drz400 and the owner installed a tm40 carb on it. Think it's running a bit too lean. Backfires too much for my liking
I paid $85 for a jetting kit from Pro Cycle (150 jet) and got the same results: quick throttle response, goes through the gear ranges like crap through a goose and feels like it can just breath better. As for that carb breather tube... no mods necessary. You just have to make sure it remains routed like it came out from the factory. If it get's close to your air intake, it will fight your breather box for air and bog down a lot.
I seriously doubt you got "the same" results. The BST40 sucks balls. Only reason I haven't swapped yet is the cost of a TM40. Seems like every few thousand miles my bike starts running like crap and I have to take the carburetor apart and clean the slide. Surges terribly in strong crosswinds. Surges at high speeds. No matter how much fine tuning the BST40 always seems to have flat spots in the rev range.
Hmm, I got much improved results. I bought a 2023 DR650 and installed procycles 150 main jet and needle on the 3rd knotch. Air box still stock, DG V2 slip on exhaust and fuel mixture screw not even 1 1/8 turns out. Huge improvement through the whole range! I can go down and cruise at 45mph in 5th gear without bike so low in rpms that I need to downshift. First gear can chug along at 5mph without having to keep blipping throttle to keep revs up or always feathering clutch so bike wont stall. I just have one minor blip I need to tune in yet but a huge improvement by at least 50% imo. Sorry you didn’t get same results.
Hey man I appreciate you making this video, I recently bought a used DR 650 with this carb already installed. Long story short I've never ridden a stock DR 650 and I was wondering if the carb mod actually made any difference. Ide like to add that im very pleased with the way my bike runs. Coming from a KLR 650, this thing is 100x better, thanks!
i have it on my klr650 (685cc). The difference between this and the cvk40 is night and day in terms of performance. Just expect a 20 mile drop on mileage if you ride with the throttle open all the time like me. Law abiding riders should get identical mileage with the cvk or like a 5 miles drop to total mileage.
Question, hopefully relevant. With the 155 jet did you modify your airbox? I just jetted the stock carb with procycles kit and so far no airbox mod here. I put in the 150 jet needle on knotch 3 and 1 1/8 turn out on fuel mixture screw. Been debating about 155 jet but wanna know if you modded airbox. I don’t wanna have to do that though.
I have been on the fence about the pumper as there is nothing on the power gain from the re-jet to the pumper and it sounds like from yours it would not be worth it. As a side note my re-jet on my stock carb runs pretty damn good never a problem with the breather tube placed in the carbs vortex. Gamet36 had the issue and corrected it by simply moving it farther away. He has a piece up on it, thx
if your bike runs goods with modded stock carb keep it unless your really into getting every drop of power out of the bike. singed strictly my opinion.
Hey Brandt, what you will mainly gain from the pumper carb is a serious improvement at very low revs. I watch your videos (which are awesome by the way), and from the looks of the type of tight forest trails you ride, the pumper could be a benefit. How much of a benefit who knows, because you already handle that bike better than most people. I guess it's just a matter of preference; some people like the pumper, and some don't feel a need for it.
Trevor man! Thanks for the kind words and recommendation. Think I am going to have to seriously consider the pumper cause more low end power would be awesome!
I just bought a 99 dr650. The PO had attempted to jet the carb and it is just about unrideable. I've restored the factory configuration but the low speed chugging remains and it also cuts out at WOT. Would this carburetor clear these issues up? And my current mpg ranges from 40 to 45. Will I see a significant change there?
As the CV carbs age on the dr it needs to be rebuilt, jets, needles, and including a new slide with diaphragm, basically a new carb. Dont waste your time, get a tm40.
I noticed u are getting that popping sound after u let off the throttle, I just replaced my exhaust with a delkevic pipe and getting the same sound, can this damage your engine?
Header Pipe on a DR650 is the main point of restriction. Simply adding a slip on does nothing for this bike. I am speaking from first hand knowledge. I have moded dozens of these DR’s. & DRZ’s. The head flange on the DR is welded on the inside. Restricting the header pipe to only 1 1/4” pipe. If your not going to buy a new head pipe, you need to weld the flange from the outside, then grind the weld out from the inside. It’s a huge, huge difference.
i did de procycle carb mode 150 jet drop the needle without modify the air intake box and above 8000 ft the bike runs so rich the stock pipe blow out and the bike stop. the change the 150 jet for the 145 3er slot needle and it performs better now without modify the air box and stock pipe
no i could not stand the jet kit i cant remember if i mentioned it in the video but at steady throttle cruising i never really got it right and i tryed every imaginable setting.
@@urbandualsport i love the jet kit on mine. You mentioned you didn't like the jet kit but at the same time you mentioned they jet kit felt very similar to the pumper. Slightly confusing really lol.
good for you. For just pottering around and cruising it's fine. Mine always did too but you won't realise how much the standard BST carb feels like it has liquorice for a throttle cable in comparison. For cruising around town in a higher gear (smooth at 35mph in top), for great response riding in on/off conditions or for getting up over the occasional log the difference is chalk and cheese
@DR Dan you're right about it being lean my pipe would turn red hot at night, stock carb been giving me problems since I've had it going to purchase the tm40 right now
@@marcogonzalez7829 I've used this carburetor to go one some long trips with my father and uncle. The longest has been 500 miles of rough offroad and little pavement. I will say it is doable, you will just need to be more observant of fuel level and not get on it hard. It gives a big boost in power which is nice, and honestly can be scary at times when not loaded down. I would say it helps with pulling a heavy load though. (So if you get it, take it on some smaller trips to get a feel for the mileage, because everything else is a boost from factory). (I personally have a 5.3 gallon tank on my bike which helps)
It is superb at very low Rpm; that irritating chugging or lugging is eliminated. It will pull smoothly from 40mph in 5th, and putt along in 1st at ultra low revs, great on mountain trails.
The restriction in the DR's exhaust is actually in the header pipe. The weld that attaches the flange to the pipe is HUGE and restricts the inside diameter of the stock pipe. Grinding that weld down on the inside of the pipe is the no-cost fix.
The restriction that ticks me off is the joint between the head pipe and the intermediate pipe…
Buy a big tube header, buy a performance exhaust….and it’s all still choked by the necked down factory joint…
thanks for this video, you are absolutely correct when you say there is not much info about this conversion. i have spent this summer modding my airbox, exhaust, and air filter, and cannot for the life of me seem to get the fuel mix correct with the jet kit in my '12 dr. i went with the JD jetting kit, put in two different main jets, used just about all the slots on the needle and still get some hesitation to the point where i am considering dyno-tuning at the local motorcycle shop to finally get it out of my amateur hands for the tune of $300. on a whim i called procycle and they said that that is just the nature of the stock vacuum carby, and the only real fix is to go pumper. i am leaning in that direction now because the difference is (about) 100 bucks more and seems more guaranteed than the dyno-tune which may not even fix the issue. i also like that they take into account your existing mods and jet the carby before they even send it to you, although it seems like they kinda missed the mark with yours. great drone footy!
I have it, too. It gives way cleaner bottom end and better response, just like you said. Runs like a thumper should.
Good video very informative, thinking of doing some work on my 2010 DR rather than spending money on a KTM! This mod is high on my want list. Pretty much confirmed what I was hoping, better throttle response and smoother engine operation.
I bought a 2005 DR650 that had been stored for 10 years. This upgrade made sense to me since I waa gonna be doing much cleaning to the carb on the bike (it had been stored with gas in it). The 450 was a bit steep IMO but any time I start to question my judgement I just take the bike for a ride and amazes again at the power delivery. The pump makes all the difderence in the world IMO.
The TM40 upgrade was the best thing I ever did to my 2009 DR hands down. I put a lot of work into that bike....suspension, exhaust, Bars, tank, and seat......and the TM 40 was the winner.Sadly....I sold that 09 and bought a quad. Now I'm starting over with my 2015 DR.....the TM 40 carb is tops on the list.
Im thinking of buying one and convert it to a supermoto because I dont want to spend 14 000$ on a ktm 500exc im looking for something reliable with enough speed for highway riding do you think dr650 is a good bike for that?
Which jet?
Standard air box or some more holes?
QcEnduroRedneck 650s are perfect supermotos...look at my klr650sm in my latest vid
Why did you choose the 40 over the 42?
Did your bike react the way this one did? What elevations did you ride at if so?
Helped me cause I plan on getting a bike in the spring and I live in MD
Thank you , this video made my mind to purchase the TM 40
Thanks so much for this video man
The only thing I hope to do with getting a pumper in the future is to get rid of the annoying surging at cruising speeds. Thanks got the review
Procycle kit. Hayabusa exhaust, big tube header, 15/43.
Carb is worth every penny.
I don’t think it makes anymore peak power but it is massively more drivable in the low to mid range.
Economy, without being overly OCD about it seems the same.
It was bolt on plug and play, not the continual tweaking trying to find the best setup like on the factory BST.
I wouldn’t say it was the best modification to the DR (gas tank), doesn’t even make my top 5 (tank/seat/tires/skid plate/springs), but it does make my top ten - so far (ergo’s(bars &pegs)/luggage/dustbin shield/ mirror extenders/TM40).
Good video, thanks.
Hi John, Nice video, I have a 2017 DR650 with a TM40. I bought the carb off Ebay and jetted it. What jetting are you running and what needle position? Just heard your running a 155. I live near Frederick MD. and PA line. I've been tweaking the jetting to minimize the backfire on decel and still retain the punch. I'd agree on the street it's not much different except at slow speeds where it is much smoother and pulls without lugging. I did the same mod on my DR350. Can't stand the CV carbs, it's kinda like turbo on a car. Too much lag. I ride Michaux frequently. Where in MD are you?
Mine was popping after I installed the pumper carburetor and i had it set the way they told me to and one day i raised the needle. I lowered the clip one notch and wow. Hufe difference. And I have the GSX-R muffler and mid pipe and then I chenged the front and rear springs and the smaller front spocket. And Dunlop knobby tires. I like it
I did the fcr-mx 39 and loved it however they cost alot of money used and the slide/carb body wears if your doing alot of miles. I sold it for a drz250 as its better on single track. If i get another 650 im doing a new tm40
Should be the number 1 mod first. Maybe except for a good sounding exhaust. CV carbs wait for engine vacuum to lift the carb slide. Hesitation. Pumper carb slides lift with the twist of the throttle. No hesitation. Totally different ways to put down power
44 tooth back sprocket smooths things out well
Great video! I have the TM40 also, plus the hi-comp piston, and the 223 cam. If you have the money, know-how, and time to do the project, it is well worth it.
The carb by itself, like you said, is an improvement, mainly because of the greatly improved throttle response and smoothness at lower Rpm's, giving the bike a much wider spread of power.
Trevor Jameson I have the exact same mods that you have I actually bought a 790 kit from procycle so I should be getting that put in very soon hopefully it's worth it
Excellent, it's great to hear from someone who is going to try the 790 kit. Please let me know how it works out for you after you get it installed and going, it would be really cool to hear about it.
@@kyoakland How did the 790 kit go?
Well after you install the Procycle 790 kit with a worked head and this pumper carb it should rip wheelies easily.
The header pipe is the MAIN restriction in the DR. Adding just a pipe does nothing. No need to replace the header pipe, but if you take it off, you will see the header flange is welded to the pipe on the inside. Sometimes the weld is so thick, there is literally more than a half inch of diameter that is blocking airflow. Take the pipe off, weld the flange on the outside, then grind all the weld out of the inside. I have seen this one mod add 3rwhp on the dyno.
What's your opinion on the mikuni 40 vs mikuni 42 pumper?
just bought TM40 pumper for my xr600r has hot cam rs3 muffler and 640 big bore hope it makes difference
thanks i think i will try 155 main jet i think she needs more fuel 150 now and won't wheelie like yours?
thanks for the good vid!
Mileage? Before pumper and after pumper? Throttle any harder to turn with pumper?
So should i jet stock carb, airbox, and exhaust? Or is that expensive ass carb worth it
i have it on my big bore klr650 (685cc) but even though the difference is huge between this and the stock cvk40, the tm42 bogs at wide open throttle and i just dont know what to do to fix it :(
Dang. The carb/exhaust is all stock on my DR650,it doesnt bog,it doesnt surge while cruising,it doesnt shudder and gets great mileage and works clear up to 10,000 elevation. What happened? Why me? 50,000 miles on it runs great,plug is a nice tan color.
Thanks for the review.... your right, not much on info besides people saying do it.. Do you have a MPG results you can give us??
Z Shark sorry no mpg mileage but I used to go about 95 miles to reserve now it's more like 80.
What jet kit did you use? Currently have a drz400 and the owner installed a tm40 carb on it. Think it's running a bit too lean. Backfires too much for my liking
i am pretty sure it came with some jets i changed around to best fit to the bike.
Mikuni hsr42. More refined and adjustable
I paid $85 for a jetting kit from Pro Cycle (150 jet) and got the same results: quick throttle response, goes through the gear ranges like crap through a goose and feels like it can just breath better. As for that carb breather tube... no mods necessary. You just have to make sure it remains routed like it came out from the factory. If it get's close to your air intake, it will fight your breather box for air and bog down a lot.
I seriously doubt you got "the same" results. The BST40 sucks balls. Only reason I haven't swapped yet is the cost of a TM40. Seems like every few thousand miles my bike starts running like crap and I have to take the carburetor apart and clean the slide. Surges terribly in strong crosswinds. Surges at high speeds. No matter how much fine tuning the BST40 always seems to have flat spots in the rev range.
Hmm, I got much improved results.
I bought a 2023 DR650 and installed procycles 150 main jet and needle on the 3rd knotch. Air box still stock, DG V2 slip on exhaust and fuel mixture screw not even 1 1/8 turns out.
Huge improvement through the whole range! I can go down and cruise at 45mph in 5th gear without bike so low in rpms that I need to downshift.
First gear can chug along at 5mph without having to keep blipping throttle to keep revs up or always feathering clutch so bike wont stall.
I just have one minor blip I need to tune in yet but a huge improvement by at least 50% imo.
Sorry you didn’t get same results.
Hey man I appreciate you making this video, I recently bought a used DR 650 with this carb already installed. Long story short I've never ridden a stock DR 650 and I was wondering if the carb mod actually made any difference. Ide like to add that im very pleased with the way my bike runs. Coming from a KLR 650, this thing is 100x better, thanks!
i have it on my klr650 (685cc). The difference between this and the cvk40 is night and day in terms of performance. Just expect a 20 mile drop on mileage if you ride with the throttle open all the time like me. Law abiding riders should get identical mileage with the cvk or like a 5 miles drop to total mileage.
@@dennisk000 Haha agreed, it definitely shows the drop in mpg but well worth it if you love power!
Hi there. Nice vid. For this video did you keep it stock gears?
yes stock gearing.
Very cool. I really appreciate your opinion. I have felt the same way - just trying to find answers myself.
Man, I would kill for my stock bike to pull like that! Who is the band at the end of this video? The song rips!
artist- abandoned by bears song- speechless.
Question, hopefully relevant.
With the 155 jet did you modify your airbox?
I just jetted the stock carb with procycles kit and so far no airbox mod here. I put in the 150 jet needle on knotch 3 and 1 1/8 turn out on fuel mixture screw.
Been debating about 155 jet but wanna know if you modded airbox. I don’t wanna have to do that though.
its been a min scince i had this bike but i think i removed the snorkel and that was it.
At least remove the snorkel. If your jetting richer, it needs to breath more. Hopefully your running an open exhaust too.
I have been on the fence about the pumper as there is nothing on the power gain from the re-jet to the pumper and it sounds like from yours it would not be worth it. As a side note my re-jet on my stock carb runs pretty damn good never a problem with the breather tube placed in the carbs vortex. Gamet36 had the issue and corrected it by simply moving it farther away. He has a piece up on it, thx
if your bike runs goods with modded stock carb keep it unless your really into getting every drop of power out of the bike. singed strictly my opinion.
Hey Brandt, what you will mainly gain from the pumper carb is a serious improvement at very low revs. I watch your videos (which are awesome by the way), and from the looks of the type of tight forest trails you ride, the pumper could be a benefit. How much of a benefit who knows, because you already handle that bike better than most people. I guess it's just a matter of preference; some people like the pumper, and some don't feel a need for it.
Trevor man! Thanks for the kind words and recommendation. Think I am going to have to seriously consider the pumper cause more low end power would be awesome!
DdI you look at the tm42 ??
1990 DR650S, kick start only. this carb situation is giving me fucking hell
I just bought a 99 dr650. The PO had attempted to jet the carb and it is just about unrideable. I've restored the factory configuration but the low speed chugging remains and it also cuts out at WOT.
Would this carburetor clear these issues up?
And my current mpg ranges from 40 to 45. Will I see a significant change there?
as long as you jet it right should fix these issues the stock carb sucks it sucks more if its been modified.
Peter check the top of the carby my stock carby was warped so was the black cap, so they suck air in there causes stalls.
As the CV carbs age on the dr it needs to be rebuilt, jets, needles, and including a new slide with diaphragm, basically a new carb. Dont waste your time, get a tm40.
I noticed u are getting that popping sound after u let off the throttle, I just replaced my exhaust with a delkevic pipe and getting the same sound, can this damage your engine?
no, popping wont do anything just make sure its not running too lean.
so many people don't wear gloves...im amazed because your hands are the first thing to hit the ground...always....and take ages to heal...
i did not wreck.
Header Pipe on a DR650 is the main point of restriction. Simply adding a slip on does nothing for this bike. I am speaking from first hand knowledge. I have moded dozens of these DR’s. & DRZ’s. The head flange on the DR is welded on the inside. Restricting the header pipe to only 1 1/4” pipe. If your not going to buy a new head pipe, you need to weld the flange from the outside, then grind the weld out from the inside. It’s a huge, huge difference.
What sort of pipe are you running? Does it have a power bomb header pipe?
Literally first minute of the video, stock pipe
@@chasp_0784 Thanks. Wow, how did i miss that? I think its because i kept skipping to the video of the bike on the road. Is it the RST or the V2 DG?
Any reason why you chose the 40 over the 42?
42 is too much for a stock engine from what I’ve read
Did you do anything to the airbox ?
removed the snorkel
did you modify the air box?
i did de procycle carb mode 150 jet drop the needle without modify the air intake box and above 8000 ft the bike runs so rich the stock pipe blow out and the bike stop. the change the 150 jet for the 145 3er slot needle and it performs better now without modify the air box and stock pipe
What gearing are you running ?
stock.
Pumper carb improves throttle response...
Tm40 145 main jet mod air box power bomb header Procycle mid pipe hybussa 1300 muffler yea it runs great but 36 mph
Philip Wilson I don't get the 36 mph??
Check the plugs. If brown or dark lean the carb until the s plugs turn a light tan, mpg will go up.
Sounds like a jet kit is the way to go.
no i could not stand the jet kit i cant remember if i mentioned it in the video but at steady throttle cruising i never really got it right and i tryed every imaginable setting.
@@urbandualsport i love the jet kit on mine. You mentioned you didn't like the jet kit but at the same time you mentioned they jet kit felt very similar to the pumper. Slightly confusing really lol.
@@johnnyturbo8460 the jet kit make the same power imo was my point not all around performance.
@@urbandualsport got ya... worth the $450?
@@johnnyturbo8460 yes especially if you plan on keeping the bike for some time....
I'm in the same boat. I don't want to rig the carb with paper clips, duct tape, and gum.
Make more vids plz
when it warms up..... so cold right now.
Lol. I’m not going to do a free mod to separate my carb filter from my open airbox mod, that’s just stupid. I will spend $500 to fix the problem!🤔🤔🤔🤔
My dr runs so sweet with the factory carb. So i have no motivation to spend $450 with little gain.
good for you. For just pottering around and cruising it's fine. Mine always did too but you won't realise how much the standard BST carb feels like it has liquorice for a throttle cable in comparison. For cruising around town in a higher gear (smooth at 35mph in top), for great response riding in on/off conditions or for getting up over the occasional log the difference is chalk and cheese
@DR Dan you're right about it being lean my pipe would turn red hot at night, stock carb been giving me problems since I've had it going to purchase the tm40 right now
Put the pedal to the metal, lol
Sounds like you need to work on your tuning before you can compare carbs lol
stock carb tuning?
I have this carburetor. It's great when it comes to power. Fuel mileage is killed though. So long trips you are crippled
So would you say this is not a good modification for the DR if I'm going to be using it for adventure riding and fuel saving is important?
@@marcogonzalez7829 I've used this carburetor to go one some long trips with my father and uncle. The longest has been 500 miles of rough offroad and little pavement. I will say it is doable, you will just need to be more observant of fuel level and not get on it hard. It gives a big boost in power which is nice, and honestly can be scary at times when not loaded down. I would say it helps with pulling a heavy load though. (So if you get it, take it on some smaller trips to get a feel for the mileage, because everything else is a boost from factory). (I personally have a 5.3 gallon tank on my bike which helps)
@@xCptLegendx Thanks for the info.
who actually wants to drive their car around slowly in top gear ? no one...why lug the engine in a high gear at low revs? people are bloody stupid...
Did the MPG go down ?
How is it at low speeds? Any chugging at a crawl?
James M They are WAY smoother down low. And they have 800x better throttle response from low rpm going to WOT
It is superb at very low Rpm; that irritating chugging or lugging is eliminated. It will pull smoothly from 40mph in 5th, and putt along in 1st at ultra low revs, great on mountain trails.