FMF Jet Kit VS Dave's Mod | XR650L
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- čas přidán 28. 08. 2024
- Dave's Mod Jet Kit and Mixture Screw
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-For business or whatever: FridaysTheBomb@gmail.com
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The motorcycle:
2012 Honda XR650L
Easton Handle Bars (No longer made)
FMF Q4 Exhaust --- amzn.to/2eSwMmJ
Smog Kit Removal (not purchasable? No idea)
Performance Airfilter --- amzn.to/2euOwSd
Tusk Billet Fuel Cap --- amzn.to/2lVPie2
Windscreen --- amzn.to/2qqdyY9
Saddle Bags --- amzn.to/2qwL4v8
Tank Bag --- amzn.to/2pPUntv
Wolfman Expedition Dry Duffle Med --- amzn.to/2dP6Zro
WolfYok 20L Drybag --- amzn.to/2zwXdo3
Tool bag --- amzn.to/2GndArK
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Motorcycle Gear:
Seven Zero Seven Helmet (Cycle Gear, no longer made)
Fox Titan jacket --- amzn.to/2e7e1uw
Sedici Viaggio Pants --- amzn.to/2e7cnJc
Sedici Ultimo Track boots --- amzn.to/2e8OaVl
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Camping Gear:
Marmot Tungsten 2P Tent --- amzn.to/2ejtmr9
Marmot Trestles 0 degree Sleeping Bag --- amzn.to/2eSIGNw
MSR Pocket Rocket stove --- amzn.to/2euVu9J
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Mic:
Sony ECM-CS3 --- amzn.to/2ejjqhv
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Camera Stuff:
Drift HD --- amzn.to/2ejjgq3
GoPro Hero4 ---amzn.to/2eSyt3n
Canon Rebel T5i ---amzn.to/2euMsto
FeiyuTech G4 Gimbal --- amzn.to/2e8P5VY
Glide Gear 24" Slider --- amzn.to/2emy4Uh
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Music By:
Sheriff by Elexive
I admire you taking time to all this testing. To be an accurate test you can't have more than one variable at a time when comparing. You are using the FMF kit with a modified slide and that's not what the kit was made for so that's one variable. You noted you tested with 1 gallon and 5 gallons thats a 4 gallons variable which translates to 24-28 extra pounds so you introduced an error making the test invalid. They probably both work well you just have to decide which one to use.
Honestly, mixing kits and mods from different places will only cause you grief. The slide has nothing to do with idle. I know this contradicts another poster, but the slide does nothing until the throttle plate moves and creates a vacuum to lift the needle. Google how a CV carb works. There is a trick to adjusting the mixture screw, it is not always as simple as screwing it in or out based on what some one else says it should be. Your problem is the idle is too low (I know stating the obvious). Start by turning in mixture screw all the way in until it LIGHTLY seats and back it out 1 1/2 turns as a baseline. Start the bike and set idle to stock (1100-1200 I think) and let the bike get to operating temp. Now here is where your modded idle screw comes in handy. Turn mixture screw in until engine bogs a little, you'll hear it. Record how many turns you went in. Now turn mixture screw out until engine bogs a little and record how many turns that was. Turn mixture screw in half way between those two numbers and that should be your sweet spot. Rule of thumb: If mixture screw is turned all the way in and the bike does not stall, pilot jet is too large. If the screw comes out more than 2 1/2 to 3 turns before engine bogs, it is too small. Don't want to come out any more than three turns as that now puts it close to the thread limits on the mixture screw and it may vibrate out on you.
This pilot screw is 160 which I feel is too big. I haven't tried putting the screw all the way in yet though. Maybe I can mess with it this weekend.
Terminology: It is called the Pilot jet and Air mixture screw.
Sheep Dog i believe this screw adjusts the addition of fuel though, not air.
The slide is what blocks the air when the engine is at idle. Thats extremely important. A fucked up slide will cause a fucked up idle.
Not necessarily true ...even slides MIGHT effect idle depending on carb ....cutaway angle for instance ? etc...might not be huge but there CAN BE significant overlap....not the needle though...I cant see that ever effecting idle
The phrase "fridays the bomb" lost most meaning to me years ago when I stopped punching a clock....actually midweek is the bomb! When all the working stiffs are not in my way!
I totally agree dougie, I do everything during the week now retired , weekends are sucky, too busy.
When your bike idles at low rpm adjust the fuel screw to get best idle. Then adjust idle screw to get the rpms you want.
I have the same bike, take on/off your air filter cover to see if it improves or gets worse, if it gets better (off) put a smaller pilot jet in if worse put a bigger pilot jet in
I pulled the cover and the filter and it didn't change much. I'll just have to keep tweaking things.
Actually that does not make sense to me....should be PLENTY enough air with out throttle opened widely...no? If the airbox is so restrictive to mess up idle circuit then idle is least of concern IMO!
So if you are rich at say,1/3 throttle, raise the clip one notch on the needle, which will lean it out a little bit .if it is rich at idle turn in mixture screw usually a 1\4 turn at a time. If it is rich at wot then main jet is too big
I used the Dynojet kit on my bike, It came with several different main jets, but you are correct about pilot jet and mixture screw. If you want to try plugging the holes in the slide, epoxy putty or JB plastic weld might do the trick,
supercrew63 haha i didn't think about epoxy
$150 Gets you a used FCR carb from ebay. I put one on my XR and its a night and day difference. Starts easier. Idles better. And throttle response is absolutely AMAZING.
Do you have a specific p.n. that's bolt on for XR650L?
This is cheaper but is it better than getting a compete carb rebuild from OEM Carburetor?
Do you have a link for these mysterious $150 FCR carburetors? I just checked on ebay and they go for $800-$900 dollars!
Also probably not for the dual carb XL600R:/
Hey Bomb.. the reason you set the idle is for oil pressure to the to top of the head or valves.. Too low the valves barley getting oil.. factory specs ... As for your carb... that cheap factory mod was good enough.. looks like your into fuel mileage.. if you really need power .. pumper carb.. jet for elevation and your good to go.. on my 3 drink.. hope I am ahead of you
Paul Davis well the jet kit was an awesome chance to tweak things. i may or may not change it back, but its been fun learning about it.
I know when it comes to mods and turning or tweaking. This subject will always stir up controversy on what to do how to fix it and how to make it better. The reality is what works for me on my XR might not work on others. But it makes for a good read in the comments section that is for sure!
Yeah it usually does cause some debating. I'm just tinkering and learning as I go though, so I'm sure I'll learn something that will help me.
Friday'sThe Bomb I think the big difference is going to be the altitude.
Sometimes just 1-turn out on the mixture screw is the the sweet spot. More isn't always better. 2-turns out on my Xr would cause stalls at idle with a too-rich condition.
2006 XR6L, 52 pilot, 155 main, Uni foam air filter, stock headers, FMF Powercore4 slip-on. 38mpg city, 44mpg highway.
I have that same problem I have an 08 model with the Dave's mod and FMF pipe anytime I slow down for a stop sign or red light it will die. And when I go to start it I have to give it a lot of throttle before it will start it's like it's running rich.
Ok carburetor basics, 0-1\8 throttle : pilot jet and mixture screw, 1\8-3/4 throttle: is needle and main jet,3/4- full throttle; main jet only. Hope this helps
yeah this is what I figured out, but the parts I installed don't relate to the pilot jet at all. So idle problems shouldn't be happening as far as I can tell.
I adjusted my idle a little bit. I have a dynojet kit and has worked great. My idle seems to run high when the bike is hot sitting at intersections. It also seems to ping alot before I added the carb kit. I think what was causing the ping was the T16 sprocket I have put in. The bike pings sometimes when really hot under load. Maybe time for a valve adjustment.
Pinging because your bike is super lean and running hot. You're cooking it.
Remember you get what you pay for... most of the time. I would definitely invest in a Mikuni 42mm pumper carb from XR’s only. Check out their website and read the description. All your issues will disappear with significant performance gains.
The stock carburetor should work properly though...
Friday'sThe Bomb Stock carbs work, but you get better performance from an aftermarket carb. Most company build the carbs to meet strict emission requirements, and make the bikes run lean
Captndarty , absolutely agree with you concerning a pumper carb. I got a pumper (mikuni TM40) for my DR650 and it was a night and day difference from the stock CV carb. Huge improvement, perfect throttle response, better power delivery, and zero issues. It costs a lot but it's worth it.
Trevor Jameson I have the same and I must agree
Looking for the remote fuel mixture screw.. and would love some stickers thanks again and keep the videos coming
I have the slide drilled and slide spring shortened on my dr650. It makes the thorttle react quicker on a cv carb. Watch adventure oz video on dr650 carb mod. Good basic info.
There is "seat of the pants" testing and there is actual back to back dyno and timed (with SAME timing equipment" ....not that much value to seat of the pants unless there is a glaring problem etc ....the mpg comparison has some value though ....idle problem is worth mentioning
If you can't feel a difference, then what are we even talking about? Im not gonna dyno the bike over a slight jet change lol
Nice job on the mixture adjuster dude. Hope you get that idle sorted soon. Can't wait for another camping video.
I'll get stuff figured out eventually. this bike has never run quite right.
Count me in for one of those screws too.
Fmf jet kit calls for fuel screw out 2.5 turns did you do that. Also should not have drilled slide with fmf spring, plus with stock pipe they recommend 160 main as well so not a good test of fmf. Just saying because I ran mine for years and it was flawless.
Is your bike de-smogged? Check your crankcase breather. Is it blowing smoke when warmed up? If so, your bike is doing what mine is, and there is a top end rebuild in your future.
nope, no smoke
Theres the idle that should already have an extension on
it and the mixture screw, that is
factory set, it is for elevation
setting don't mess with it enless
U study up on it that is what is
going on. Don't listen to the experts, study up on this and
U will be your own expert, then
U can spread the real information.
THANK'S from NOR-CAL!!!!
Check the plug when, your testing that should tell "the rest of the story".
THANK'S from NOR-CAL!!!!!
My Suzuki Dr650 I put a 170 jet and and a thinner needle, it runs great.
I also cut my intake box and a slip on exhaust.
Drilling the slide and weakening the spring is defeating the idea of having a cv carb
Liked and subbed , does that cap fit the stock xr650 tank?
I dont know, but the stock tank locks right? It might not he compatible.
I would be very interested in buying a mixture screw extension!
Once I get the design ironed out I'll make a video on it and post an ebay link.
Hey guys just bought an 07 650l that is stock. The guy took off the air box lid, and removed the baffle . Guy did some other mod that required holes in the side plastic cover as well. He went back to stock jets he said, but its running like crap. I need to get this thing jetted properly to this open air box and open baffle!please help. Thanks in advance
How many needle adjustment points are on your needle?
Mine is jetted at 165. I wish I would not have taking the air box out. It gave me more power but if it starts raining my bike will about shut off. It sucks in water into the carb.
The Steel Horseman you took the airbox out or the snorkel thing?
Friday'sThe Bomb snorkel. I should have just cut a hole out of it.
The Steel Horseman
Haha same but different, my bud just pulled his xr200 out of storage and said it ran rough...
he pulled the airbox cover and the damn mice pilfered his air filter !😂😬
Great videos good sir! I appreciate them. If you order the kit and it doesn’t come with a pilot needle, which should I buy? Also would you do this over Dave’s mod with a stock bike? Thanks
Frank Deckard i would use the kit over the daves mod only because you don't have to modify the slide. Not that it ever matters in the end, but I'd rather use the spring in the kit and have a slide hat hasn't been drilled. The pilot jet mainly effects your idle, so I would stick with the stock one unless you live at high altitude.
Frank Deckard oh you said pilot needle. The kit should come with a needle I thought? Shimming the stock one with a washer like the with the daves mod should work almost the same in my experience.
Friday'sThe Bomb appreciate the response. The link in your info to the amazon one, people said it didn’t come with pilot jet just main jets. I just wanted to make sure I didn’t need to order anything else. I am bike ignorant when it comes to mechanics so I probably worded it wrong lol.
Some kits will come with a pilot jet but it may not be necessary. The way I understand it is the pilot jet controls fueling at startup and idle. Then you can fine tune the fuel coming through the pilot jet by adjusting the mixture screw. My motorcycle had with a 60 pilot and 160 main jet when I got it. So if you want to experiment with it I would suggest buying a 60, but don't go bigger than that.
My startup and idle problems ended up being due to the fuel mixture screw being tuned wrong for a 60 pilot jet. The previous owner had the screw turned out 2.5 turns and all it took to correct the issue was changing it to 2 turns.
I'd be interested in a mixture knob assy. Please post a link if you decide to bring this idea to life. Thx. Dan L
It is now available at the link in the description.
Is the rest of the bike stock? Do you have a K and N air filter? I know some jet kits are best for bikes with at least some mods such as air filters and pipes etc.
Blue Moon fmf slip on and uni foam filter. though the filter needs to he cleaned and oiled
Why do you have to drill the slide holes out bigger
The holes have some effect on how easily it moves. Making them bigger "lightens" the slide. It simulates using a lighter weight spring, like what you would get with a jet kit. Using a lighter spring is preferable to drilling the slide though, because it can be undone.
id be interested in buying one of your mixture extensions
Thanks, I'll make a video on it once they are finished. The design is pretty solid but it isn't quite ready yet.
Can you make a video explaining your camera and microphone setup?
Blaise Thompson i used to have one but it wasn't very good so I deleted it. search "best motovlogging setup" and you'll find good stuff
I’ve removed the smog pump and going to put on a Fmf powercore 4 slip on what do I need to do to get the bike to run right just install the Fmf jet kit?
Jet kit should do it. However, the lighter spring that comes with the kit will not work with a slide that has had the holes drilled larger, which is part of the daves carb mod procedure. If your bike is used, you should open up the carb and see if a previous owner did this modification.
I can’t believe that mileage is so bad. My crf250l stock gets an average of 85 mpg driving conservatively. Best I ever Got was 92 mpg driving a lot at about 30 mph
Yeah dumping more fuel in doesnt do much if you cant suck more air in with it. The bigger jets really just made it run rich.
Lol I like the plastic screwdriver but don't you have a tool bag on the back....?
It was missing from the bike
When removing the smog kit I got with a number of plugs. Of which 3 small plastic plugs for which I did not get a description. Which hoses can I remove on the carburettor and plug?When removing the smog kit I got with a number of plugs. Of which 3 small plastic plugs for which I did not get a description. Which hoses can I remove on the carburettor and plug?
Dominator 1994
I do not know, my motorcycle already had that installed.
@@FridaysTheBomb Tnx, Do you have the instruction paper you showed in one of your videos?
You are probably referring to the Clymer service manual. You can buy one online.
@@FridaysTheBomb Nope, just 1 paper sheet, that's comes with the smog kit! I misse that information and do not know where the smog kit comes from!
Do you or anyone else know what might cause my XR to chug and pretty much fall on its face in the higher rev range? I dont have a tac to know what RPM it happens at but its been so frustrating to have to shift so early in the rev range to prevent it from chugging...makes it feel like the bike is under powered...any suggestions are welcome....great video as always!
Jordan Maus I would recommend checking your main jet. Even if it visibly looks clean, soak it in carb cleaner. Just my 2 cents.
Jordan Maus i was going to ask if you have cleaned your jets but Nate beat me. you can also try soaking the jets in the surface cleaner called Simple Green. but that cleaning things is where I'd start.
Jordan Maus ,basics first, check air cleaner,spark plug,check for fuel flow . depending on mileage, maybe valve adjustment
A fowling spark plug will have the same affect as your signaling for more fuel and the spark dies off, can be many things.
5 gallon gas tank? is it an aftermarket tank? or does the xr650 come with a big gas tank?
Hank Amarillo its a aftermarket tank
+Hank Amarillo 4.7 gallon actually but i always forget. Its made by a company called clarke
Care to share what 1 and 1/8 handle bar adapters you are using?
The bars are mounted to clamps that came with them. The brand is easton, and they were on the bike when i got it
I hate not having time.
The Steel Horseman ive been working overtime man. i get to work at 630am and leave at 530 or 6pm and I'm in bed by 9pm. i love it and hate it
You need to leern how to tune a carb
What handle bars are you running and tank. Thanks
The brand is Easton. They no longer make handle bars for motorcycles.
I just ordered FMF Powercore 4 and I don't know if doing Dave's Mod or the FMF carb Kit? Can anybody help me. Thanks
Erinson Duran i would do the fmf carb kit if i could do it again. The daves mod will accomplish the same thing, but it will "damage" the slide, and you have less adjustability. The carb kit has a needle with an adjustable clip and a lighter spring.
I tried a the carb modification by installing the kit it made my bike run worse I took the stock carb off and installed a 42 mm pumper carb
Sorry for replying to a 4 year old post..
No worries
I want one of the mixture screws
Bobby Ratliff i made 9 but they sold out. I hope to have more available by November 27th
Bobby Ratliff i will mention it in videos as soon as they are done, and will restore the ebay link in the description of THIS VIDEO
I got mine, good buy.
It's your slide..you need to buy a new one. Once its drilled, it's only good for Dave's mod.
Yes, thats the issue.
Dude, why don't you have tools in your tool kit?
+Leonard Hurst the little bag is torn in half. The strap inside is just holding my registration but anything else would probably fall out lol
Well, having tools while on a road trip is a must but have you ever thought of buying a leatherman? Not the best tool but it will get you out of jams like this one.
Leonard Hurst i used to have a leatherman, those are super handy! on road trips i pack tools in a rollup bag. I've been strapping it to the outside of my gear, but I've been meaning to make a pvc tool carrier on the bike for permanent storage.
Xr600r is the best mod
Did you move from AZ?
I still live in AZ.
More air maybe?
Remove that snorkel in the airbox. Which you have probably already done. I changed my bike massively I was having the Same issue after rejetting.
This is why I leave things stock. When you tinker with things you end up messing something else up.
Not enough to brag about fmf dropped the ball big time
Any "power gain" is marketing. These sort of mods just improve throttle response.
Is there anybody that could be talking and pulling a wheelie the whole time he talks the only time he opens his mouth is when he's f****** got a wheelie going interesting
I have no idea what you have tried to say here.