The Anatomy of a Harley Davidson CV Carb : Pro Tip
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- čas přidán 22. 07. 2020
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The CV carb has long been a staple of the Harley Davidson that is often overlooked for "better" aftermarket options. The reality is that the CV or constant velocity carburetor is a very capable carb, especially with a little modification. We show you the basics of the CV carb and point out it's strengths and weaknesses.
#HarleyDavidson #CVCarb #Carburetor - Auta a dopravní prostředky
Get more tuning tips on Countersteer : www.jpcycles.com/countersteer?The_Anatomy_of_a_Harley_Davidson_CV_Carb_:_Pro_Tip&PQ3Eoanbtp4&feature=youtu.be
I am rebuilding a VW experimental airplane engine conversion. It has been out of service since about 1985. Should I get a kit that is alcohol compatible. Just clean an inspect or buy a new CV carb Off eBay. Is there a kit manufacture you recommend? Where can I get a main jet for higher altitude. I am at 4000 above sea level and will be At 6000 to 10,000 above seat level. Thanks
IMO THE absolute best carburetor ever made. 100,000 plus miles on my FLHTC and several Sportsters and a Super Glide
Excellent video by a competent technician who spoke clearly . Well done to the filming man too . It may have been worth mentioning the emulsion tube as the reason for my '96 Wideglides poor running was the tubes tiny holes were blocked due to the Bike sitting for over a year . Dried un-leaded petrol to blame . Thanks for posting ! .
Excellent video, brother. Very informative and exactly what I was looking for. Thanks so much for taking the time.
Right on. Thanks for watching
Great video! Nice to see how the parts actually move with respect to each other, and it's pretty clear where you need good o-rings for proper operation. Thanks!
Great video. Thank you! We need more carb videos online.
On these accelerator pumps ,there should be NO gas in the top side where the rod is...If there is gas, there is a no seal condition or breaks in the diaphragm which will cause a puddle of oily cooked gas on the crankcase right up under the carb ...It took me a year to figure that one out.. I was thinking I was getting crankcase breather oil mist blow by the whole time. It ended up being a bad diaphragm in my accelerator pump causing the stain on my crankcase which I can't remove n
Super job! Direct to the point
Since it’s a Japanese carb, they use JIS Bolts. They usually strip when people use a Phillips Screwdriver instead of a JIS Screwdriver… from what I personally learned in the past… multiple times
1st time watcher but most definitely will not be the last !!😎👍👍👌👌🤘🤘💯
Thanks!
loved the video. subscribed for more and will be watching. this one helped me tremendously with my rebuild kit i just had purchased from...you bet J & P CYCLE BABY! :)
I have a cv on my 2001 Buell M2 cyclone. I love it . But from the Buell factory mine came with a idle adjustment cable that works excellent. I'm not sure what part number they used but I recommend everyone get that part. It makes adjustments easy because you can just grab the knob that hangs out just above the top cap on the carb. And just below the gas tank . IT IS SWEET!!! And as for there not quick too respond!! That's bullshit! I have 2 on my Buell and my FXR AND THEY RESPOND LIKE LIGHTNING !! ITS ALL IN HOW YOU SET THEM UP!! MY BIKES ARE SUPER FAST OUT OF THE HOLE AND ALL THE WAY THRU THE GEARS. NO HESITATION EVER!! MY SETUP IS MY OWN SECRET! YOU HAVE KNOW THAT CARB INSIDE AND OUT!
Incredible knowledge 👏 👍
Thanx Patrick lotta help on this video
Awsome video I cant wait to get my 88 sportser project going
THANKS A WHOLE LOT SIS , STAY AWESOME AND PLEASE BE SAFE !!
Great video! Thanks 👍
👍 Good info.
Very nice video thank you
I purchased my first Harley Dyna about 3 years ago, upon opening the carburetor up cuz I was having some issues... I found that the diaphragm was missing along with the spring and that the needle had just been flopping and bouncing around in there, what look like since day one... I was shocked that it actually ran like that.
Easy. Great video
What is the brass plug right next to the mixture plug? The carb bowl wraps around it. I accidently drilled this one out when i was looking for my mixture screw.
Good job!!
Thanks for the breakdown video. ‘96 1200C needs enriched halfway out to run smooth but then when idle at a light or stop the idle is higher than it should be and I want to fix it. I’m guessing gas varnish so needs a good cleaning??? Don’t need high performance just smooth running and good low idle. Do you have the carb rebuild kit for it and what does it cost? I’m in Raleigh/Durham NC. Thanks again for the video.
Well done
Hi great vid,it appears my slide is not going up and down when it using accelerator,idles the can rev it was back firing but not just dies,thought it was the vacuum on petcock(2001 883r)replace that but still having trouble ,cheers rob
Awesomeness 👊🏼
Upgrading my stock air element on an 06 FLSTF to a Vance & Hines VO2 Rouge. Already have Vance & Hines Longshots. Do I need to rejet my stock carb?
Any idea on what my air flue screw should be turned out at in a 03 1200 with straight pipes and stock breather
So i been watching your video for a hand full pf times and i want to kno if thers is an specific way to assemble back the diaphragm back im having issues wt the diaphragm not duing what its supposed to do its brand new but i just realized from your videos i put mine back together a dif way its that pice that goes after the spring ... the tip goes up or dawn ?
I have a Vulcan 750. It cost a lot to get running so I started working on it myself. Can’t afford the $175 hr mechanic. After having two carbs “broken” according to the mechanic I’ve started messing with it here and there. I found a cv40 conversion kit online from a German welder. It seems to be a good option for simplifying the carb a little and making the parts cheaper. My issue is I am more a small motor and two stroke mechanic than these carbs. So after getting it on I got it to crank and fire but it will only hit one cylinder and then wait for a full rotation before it will fire again. I’m at 500 elevation and was wondering if there are any tips for me to just get if firing so I can start adjusting from there. What size jet should I use? Ect. I’m going to be playing around with different adjustments next week and see how it tunes out.
Cool „twist“ tattoo!
Good video.
Just got a 1984 low glide FXO glide FXRS came with a is in with a newer CV cooperator with the accelerator pump I pump I brought the jet down to 42 and it still seems to be overjetting it's loading up on idle any suggestions as to what I do next
I have a question. 87 FLHS with a stock CV. Recently change all the boots and all was well for a month or 2 now all of a sudden theres no snap acceleration while at speed. It's like trying to kick down a 4 bbl but the 2 barrels dont open, it just slowly accelerates. Having a look and acc pump is spraying fine but slide doesnt seem to go up when I feed it the juice. Vaccum line looks to be hooked up. Oh ya, it's fouling plugs like crazy too. Any help appreciated.
I've got a 2003 sportster 1200 how do i know what overhaul kit to order
Well done. My first CV. Question, can I change the petcock to gravity vice vacuum feed? And do I really need the other two vent lines. I see no reason for them. 1999 FXD in MT. Thanks in advance for your input.
why would my idle mixture not change even if i turn it all the way in? i rebuilt it and replaced inatake seals with still the same results.
Very well.
What About rebuilding a HD CV adapted to a light sport experimental airplane VW BOXER engine. Can it be rejected for higher altitudes. Will a kit have o rings gaskets and diagrams alcohol compatible.
How do I find that brass elbow for my 04 sportster my plastic one is leaking too
tinkn my ole ironhead needs a CV on it!
🤘😎🤘
J&P Cycles, where do you recommend jetting, to start?
TC88 2:1 exhaust, aftermarket air cleaner, no internals.
195/ 48???
This is s really great explanation of how these carbs work!! I used to look at the CVK40 carb on my 2003 Vulcan 1500 Classic and it was completely CHINESE to me as to how it actually operates! Lol. With all it's little holes and passage ways and such! Lol. This video (and a maybe one or two others) really helps you understand much better!! Thank you J&P Cycle for the video!!! : )
I have a 2002 road king. I purchased a CV carb off the internet. The original carb was leaking gas. Not knowing, I didnt pull the jets off the old card. I tried getting the best idle with the new carb, but cant. The airmixture screw turned out more then three turns and need more turning. I am thinking pilot jet too small. what came with the card was 3 of each pilot and main jet. 180,185,and 190. Pilot 42,45,and 48. How do I match them up if changing out? Can I changeout the pilot jet without touching main jet?
So I got one of those accelerator pump nozzle upgrades from JP Cycles - the one with the ball and spring. There are zero instructions for installing it. The company that makes it does not respond. JP has no idea about it - so has anyone here ever installed one? If so, what's the procedure? In the reviews on JP Cycle's site someone mentions drilling. That seems like it should be explained somewhere! Nothing came with the kit in terms of instructions. Any help out there?
The. For making the video easy to understand. Yea.for y'all Dominic G. Phx. Az.
Where does the vacuum that moves the slide up come from?
great video, thank you!
last weekend i bought a 1997 XL1200c but the seller had zero info on it. today i disassembled, cleaned, and reassembled the carb. My needle looks different than the one you showed and my slide is plastic. How would i tell if it's got a thundeslide kit in it? please / thank you
If your needle has different clip positions it is not factory and most likely a dyno-jet needle. All of the thunderslides i have ever seen have been black plastic. Factory or CVP main jet holders (emulsion tube) are a hexagon and have multiple holes along the side, if your main jet holder (emulsion tube) is round and has only one hole per side then its most likely a dynojet emulsion tube. Hope that helps you some.
Why do i have a plastic tube behind my carb with an open end and leading to the rear of my 03 softail?
Hi great vid. So cleaning my bowl I barely touched the thin brass tube sticking up in the middle of the bowl. It appears to be part of the drain/overflow. Is it a vent tube or a overflow? Just wondering how serious it is. They do not sell these bowls any longer and I have seen some without this tube. I was thinking of soldering it back on instead of buying aftermarket carb. But if it is just a vent for draining then maybe it’s nothing to worry about?
Thanks in advance for your time .
That's your accelerator pump nozzle. You need that.
how can I test my choke? 1988 sportster 1200. not an Enrichener on the 1988 I read. I am getting quickly fouled plugs and black smoke from exhaust. Carb is very clean, bike bogs down and dies. how can I know if the choke is functioning properly? maybe it is letting too much fuel in?
What would cause fuel to leak from the two small holes behind the air cleaner ? 99 Electra glide with CV carb. Thanks
mine was slightly leaking in that area. got a keihin carb rebuild kit. has all the orings and shit you need. cheap too, was less than expected. so far its been a easy repair and im no mechanic. common sense, a manual, and watching some videos like these go very far. good luck in your repair!!!
So I just purchased a CVP premium tuner kit, also replaced the accelerator pump. I installed everything, however I think I have a small spring leftover about the size of the one that goes on the air/fuel mixture screw but a little smaller. Can you tell me what all gets springs? I put everything back together and the carb doesn't seem to be getting any fuel. It wasn't having any issues before. I put everything back together, turned the fuel back on and tried to start the bike. When i rolled the throttle nothing was coming out of the accelerator pump needle and after taking it back apart there was no fuel in the float bowl. Possible issues?
sounds like the small spring located with the diaphragm that is on the float bowl lid. has 3 screws on it. thats where the fuel goes into the bowl from. without that spring you wouldn't get fuel
Yeah I got a question. Looking at my carb (2001 Softail fat boy 88 in) there is a fitting on the fuel line side that looks like a hose goes to it like a vacuum hose but I don't see anything and didn't take anything off of it so should that be plugged or should something be going to it? Thanks.
That’s the overflow
The accelerator pump's diaphragm didn't come out with the top plate for mine
Great video. Can you tell me where I need to attach the throttle cable vs the idle cable on that wheel? Which cable goes on the front and back if you’re looking at the carb from the air filter side? Thanks
looking at it from air filter side the idle control cable goes closer to you and in the outer position. the throttle control cable goes closer to the bike and in the inner most position. hope that helps. i just toook my carb off and labeled them A and B so i would know where they went back. I can't take the credit. That goes to my Clymer repair manual for that suggestion
😎
This is a good video. I appreciate you making it. Where can we get the allen screws, to replace the ones that you told us about? Is there a kit? I have a 2003 Sportster 883C, with stock pipes that I don't know that I'll change (at least not for a long time), because I really like the sound and feel. Do you recommend any particular upgrades and settings (like with the needle, if I upgrade it to the grooved style) to my carburetor? I don't know, if I can go to a stage 1 or 2 kit, with my stock pipes, and what all entails. Is that part of what you'd recommend?
Google CV preformance , they have sweet kits to buy with all kinds of upgrades. It woke mine up
@@gaknskk so the guy is commenting on a JPCycles vid- and you send him to google for parts ??? a__hole.
Good video did the screw upgrade ,why do they pop Through the air filter and can that be corrected in some way ? Is it timing ,maybe reversion ? Too much fuel ?
01-1200 custom sportster,already changed jets from 42 to 45 pilot and 160 to 165 main also Arlen ness monster sucker .I know the vid is a few months old but hope you see it and might have some information,thanks
More often than not the popping through the intake is caused by lean condition. When does the popping occur?
@@jpcycles when it’s cold ...at start up with a little throttle not as often when it’s warmed up but every now and then , got the monster sucker and Vance & Heinz short shots ,thinking air fuel screw ...
Make sure you don't have a leaking vacuum hose. The one on the back. Mine rotted and split just slightly. I replaced the hose, and it runs like a dream now.
great video on the CV carb, only problem is...I cannot seem to find any CV carbs for sale on your site... I have a CV for my 96 big twin that a wrench destroyed by drilling a hole in the side for a Thunder-jet kit, he messed up and now the jet is loose and will not stay in place, so....any idea's ? options ?
eBay
@@MiguelToro-dg1te looks like Japan knock offs to me
Just one complaint. I'm elderly with Bluetooth hearing aids and watchb on smartphone.
The music makes it difficult
me to follow your dialogue.
Otherwise, great video.
when you pull the top cap with diaphragm, spring, and needle off at 7:03 it looks like the white plastic piece inside is upside down. shouldn't it have the "feet" that stick out at the bottom so the spring slides over it?
You're right. It was upside down. Confirmation......a year later 😅
@@bigdeal5394 And that's why when you moved the slide up , the needle came totally out of the jet.... I was wondering about that.
@@EkClassics OK, so was that done to raise the needle to richen the part throttle?
Watch Aron's Garage ; How to Rebuild and Tune HD CV
Carburetor .
5:55 i actually thought there was a mosquito coming at me
I have the same carburetor, but it keeps leaking gas, do you know a solution? Cz i heard that it's from the floater, and you didn't talk about the floater in your video, thank you
Your petcock closes with a diaphragm working correctly if the diaphragm doesn’t see vacuum it will close
If the petcock diaphragm won’t hold vacuum it’s bad
Try a new petcock
You can use a vacuum tool on the fitting on the back of the petcock to check if the diaphragm will hold vacuum
On the top backside of the carb there is a hose barb sticking out what does it go to??
That is the vacuum line to the petcock.
My 2006 Harley Davidson Sportster 1200 leaks fuel from the overflow tube even when it is not running. Should I change the carburetor or what?
Petcock diaphragm is bad buy a new petcock
If it's leaking from the small overflow hose at the bottom of the carb, it's because the float seat is not sealing. Try a new seat, or float valve or whatever it's called.
I'm having trouble with fuel coming out overflow has happen several times any help
change the float needle, float valve or whatever it's called. It's not sealing properly and is allowing too much gas to enter the bowl and then it overflows.
Where do I go in order to upgrade my carb?
What kind of carb do you have?
Any videos on replacing the choke ?
you unscrew the cable from the side of the carb, and pull it out. installation of the new one is the reverse of removal.
@@D.R.270Thanks
My overflow line constantly leaks all of a sudden. What could be the reason for that ?
Bad float ,or debris obstructing the float bowl needle hole.
As always, no one talks about the vacuum ports and vacuum lines
My cv is leaking fuel when I open the fuel line
Is that fuel line a prebent? Who stocks it?
CV preformance
@@gaknskk thanks
Yeah man! I wanna get rid of all my FI and put on carbs...Hate that computer stuff! I mean whatcha gonna do when the power grid shuts off? :)
Where does the Over-Flow line go to???
Down to the ground
Replace that plastic crap fuel inlet ,with the brass one while you have it out ,dont skimp like HD did ,unless one day in the middle of nowhere, it leaks gas onto your hot engine and you
The music ruins the video, sorry .
Gosh loose the music! please 😮
another video with annoying background noise. did your teachers at school play music while talking? NO. there is a reason for that. DAWK
Zero konkretow a jedynie banały wypowiedziane patetycznym tonem