How to tune your CV carburetor rebuild & float adjustment Tutorial ep18 Roma Custom Bike
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- Опубликовано: 19 июл 2024
- ***********************NOTE*************************
NEW UPDATE CAN BE FOUND HERE:
• How does CV carburetor...
New Carburetor video "CV vs Mikuni:
• CV Carburetor VS Mikun...
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Custom Cez explains the carburetor rebuild and adjustment on his CV Harley Davidson carburetor, even for sportster ones.
In this episode we tackle the rebuild process from the carburetor cleaning to a few modifications and especially the float adjustment of a Harley Davidson CV carburetor utilizing a standard rebuild kit.
Everything is home made and DIY as usual!
Custom Cez also explains the theory behind the float adjustment and builds a simple tool to keep the carburetor at 15 degrees for the measurement.
CHAPTERS:
00:00 - intro How to tune your carburetor
01:10 - the problem: carburetor sputters and licks fuel
01:52 - carburetor disassemble from motorcycle
02:08 - standard rebuild kit
02:18 - disassemble of membrane, spring and guillotine
02:30 - check membrane for damage and replacement
03:32 - guillotine cleaning and finish
03:50 - reassembly of the top side of the carburetor
04:52 - disassembly of the bottom part of the carburetor and cleaning
05:25 - the diaphragm a the priming fuel system, check and rebuild
06:17 - float disassemble and fuel valve
06:57 - float adjustment procedure explained
07:23 - positioning the carburetor for float adjustment
08:00 - carburetor assembly and installation on the bike
You might also want to check out our engine rebuild videos:
• Engine rebuild Harley-...
• How to rebuild the eng...
• How to rebuild at home...
NOTE:
It has been pointed out to me that the way described in this video is not the right way of replacing the main slide membrane, the BEST WAY is to purchase the SLIDE/MEMBRANE replacement together!
You can find one here: cv-performance.com/harley-vacu...
Made in Rome, Italy we take a look at an European approach to modifying and customizing an Harley Davidson with Custom Cez, an amateur customizer in his home shop.
An RMPnet.com production, music by FAS.
Visit the show homepage www.romacustombike.com/
or the episode page: www.romacustombike.com/web-ser...
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I have been educating myself on carbs from RUclips and i can say your video is by far one of the best ones. Keep it up brother!
My dear friend!!! I have almost no expertice on maintenance but let me tell you, you are a very lucky guy!!! fortunatelly for you the float pin was not enought "tip crushed" so could "slip" out WITHOUT breaking the bases! The arrow close to the left base (looking the air/fuel mixture screw upwards) indicates the direction to take OUT the pin!!
Otherwise the grafics of your videos are really great and are very very educational!! good job and carry on mio amico!!!
Saludos desde Mexico, Paco.
Hi Cez. What an excellent instructional video especially using that lump of wood cut at 15º to help set float bowl height.
I'm going through the same kind of CV carb woes and your video was very helpful. Nice hack to put a little oil on the diaphragm to get it in place easier. As well as checking the correct float height. Very well done, thank you sir. 👍
Great data ...Watching because I am chasing a backfire on decelerating on a 500 CC UTV with this type of CV carburetor
Don't try replacing the slide diaphragm on newer models as shown here. The new version slides are glued under the plastic retainer by the factory to keep people from tampering with them. Plus you risk leaks and poor sealing or having to replace it again in the near future. A replacement vacuum slide for your Harley is far more reliable. CV Performance specializes in parts specifically for Harley CV carburetors if you have any questions.
Also many of the replacement diaphragms available online (ebay, amazon, etc) were originally made for other models and don't fit correctly, so beware. The factory unfortunately never made replacement diaphragms for the Harley slides.
CV Performance thank you CV performance, I went nuts trying to figure out how to remove it "properly" but then, beeing so frustrated, i just pulled it out and figured that's the way to do it...thx for the update and i'll check you out for the "right" solution.
CV Performance so u suggest this? www.cv-performance.com/harley-vacuum-slide/
CV Performance Hi Custom Cez, great video. Yes that is the correct vacuum slide for these carburetors you linked to. You were lucky enough to have a slide where the diaphragm pulled out but others might have a glued in diaphragm or pinched too tight to replace. Working with these carbs for over 25 years I've found it is much easier to replace the whole slide than to struggle with the rubber piece and risk failure later. In your country (all Europe) Motorcycle Storehouse distributes slides through local shops or you can order direct from CVP in the US.
Motorcycle Storehouse part 901507 www.motorcyclestorehouse.nl/product/901507
or direct from CVP: www.cv-performance.com/harley-vacuum-slide/
CV Performance Thank you man! i'll publish an update on the video were i'll share your link and info :)We are doing a cv carb in a coupple of weeks for a friend so know that one order from europe will be mine :)
Thx again for the info
Cez
I've been looking for a video on how to rebuild my carb. thank you for this
+Reed Cardon No problem Reed, thank you for letting me know you enjoyed it :) in a couple of days I'll publish a sort of "part 2" of this that I'm editing as we speak with more details on adjusting the mixture screw and a few more suggestions on the rebuild process from the viewers :)
+Custom Cez sounds great! I look forward to it
Hell yea man nice video. been having all kinds of issues with my bike. popping and sputtering. had the carb cleaned and what not. Think i need to tune fuel to air ratio. Thanks for the vid man it was a huge help!
You are very welcome Ryan!!!!
thanks for the vid, i am about to do this for the first time
Thanks for the vid! Just about to do my first rebuild and re-jet, so this is great. I am going to stack some wood shims until I get the 15-20° angle for the float because the plastic float on mine is cracked. Appreciate the video!
Glad it helped
Don't try replacing the slide diaphragm on newer models as shown here. The new version slides are glued under the plastic retainer by the factory to keep people from tampering with them. Plus you risk leaks and poor sealing or having to replace it again in the near future. A replacement vacuum slide for your Harley is far more reliable.
Ken M i think i replied to you under an other user name :) but thx for the input, i'm checking out cv performance for the solution :)
thanks for your vid, grate help, i may have found out why my bike doesnt run , good one man, best of luck with your channel
Thank you man!!! Hope you get the bike running soon ;-)
Bravo.. I’m rebuilding mine tomorrow just got my kit in
Today …guess if carb Leaks check for Vacuum leaks
Good video brother.For real “
Hey Custom Cez, I've got a Nissan a14 powered pickup which I did a bike carb conversion on(4x 34mm keihin cvk v598 from a kawasaki zxr250r) and Ive jetted them with 35 idle jets and 114 main jets, I've set the float levels to 13mm,topside membranes and springs were OK as well as guillotine barrels just cleaned everything well, basically I serviced them and jetted accordingly to suit the 1400cc engine which has ported and polished head and 284 degree camshaft. My problem is that when I played around with the jetting (only on mains, idle jets are standard items) I found that when going lower in size from 114 mains, the engine would not rev past 4500 rpm and going bigger it was very rich and I had to replace fouled spark plugs every few days, I feel that the jetting is more or less right for the engine size however it still runs rich and when it idles too long, it seems to flood the engine because it would then start to misfire and have visible fuel sitting in the cavities when viewing from front of the carbs from there it just gets worse. I think I got the jetting correct referencing from weber dcoe jetting on same engine. it has been running abit better however I'm still going through plugs and still need to replace them not so often as before. It's been a struggle but I do not want to give up until I get it to run efficiently and reliably. Please help
Best Regards. Jason Alexander (South Africa)
Nice work!, this motorbike sounds like my Citroen 2cv great sound.
Great job...Thank you for posting...you make it look easy ..I'm will try it....Thank...
Surapol Kantathavorn Thank you Surapol for watching and commenting :) It's not that hard, maybe intimidating, but if you are careful you shouldn't have any problems :)
Nice vid Chez , maybe a litle tip four the next one . Leave some specs about screwing the screws, and the adjustments of the gas and air sprinklers.
avondschool you are right man! i left that out, I'll do a pick up in the next video :)
Thx man!!!
a great video!
Hi Roma, loved the video, but you did show putting the accelerator pump diaphragm up-side-down. The flat side goes up. The ridge side goes down into the groove.
Love your video. good job and it's not boring!
Thank you very much man :)
I don't know if you noticed but i did an upgrade to this video I'm sure you'll like!!!
ruclips.net/video/-B-fLDOBqzo/видео.html
Ya. It's pretty cool
Great info & I'm curious as to what would cause the float tab to bend off it's setting.
just the motion of light taps and millions of times of rocking back and forth as you pilot your machine.
Thanks for the knowledge and insight into this beautiful piece of machinery . ... oh, and I'm now said SUBSCRIBER :) lol
I understand that this is an old video but keep in mind that if you could pull the diaphragm from the plastic rings, then it was not sealed. Thus simply pulling it out and replacing it makes no difference to purchasing a slider/diaphragm set.
Some carburetor models have the diaphragm tightly built in the plastic rings making it impossible to pull them off, but even those can possibly be fixed with some glue and a cutter.
There are even glue and diaphragm sets on ebay that go for far less than the slider set. Check on youtube for tutorials.
Great D.I.Y. video. Would like a bit more technical details on carb removal and installation, torque specs, etc., but very entertaining, to say the least...
+FJSA Steve thank you very much, I might do that very soon also about the adjustment screw as it has been requested quite a bit.
Thx again :)
you did install the accelerator pump diaphragm up side down. and your original one was installed correctly. the rid on the diaphragm goes in the grove on the carb base.
Thank you John, I did correct this at a later time :) thank you for pointing it out
THANK'S!!
dude you are the man!! thanks for vid..what type of bike is it
Thank you man :-) it is a 1991 fxst
What about 2 cv carbs together on a vt1100. Do you work on 2 carbs attached before?Whats the T plugs that connects them both on the top ? Is it over flow? There's gas pouring out and it runs like shit. Would shims on slide needles cause this?
This is a dumb question but if my 81 GS550 has 4 CV carbs if I wanted to put modern carbs on it would I still need 4?
Thank you.
you are very welcome :)
Hey man, great vid. At 5:11 on the bottom of the screen there is a hole with an adjustment screw inside. Can you tell me what this is for?
Hi Connor, thank you very much :) check this video out were I explain exactly how the carb work and how (and why) to adjust that screw :)
The small brass top hat looking thing left in the bowl at 8,11 goes on the carb top under the throttle cable bracket. It's there to stop over tightening and cracking the plastic top. Looks like you forgot to fit that bit.
i would like to know /or see a video on taking out and reinstalling enricher cable from carb. this ought to be a good one for us that need to know. Can you handle it ???
rcmoot hehe, sure can man :) i'll do it soon since i have to take the carb out for an other project :)
Molto bene as usual. Caught a blooper though. Accelerator pump diaphragm was installed upside down! Ciao from USA.
Grazie David. I was sure it was the right way, not that the manual or the replacement kit had any useful info :-) but i'll open it up and see. How can you tell so that i can fix it? Thank you.
The raised edge goes toward the carb in its own slot. Flat side of the diaphragm goes toward cover. If I saw it wrong I apologize.
Don't apologize, i thank you for the tip :-)
You installed your accel pump diaphragm upside down the ridge faces the the bowl if I'm not mistaken. Why did you add an o ring to the top of the accel pump jet?
+kurtis mazzone Hi kurtis, i installed the diapham the way the previuos one was installed. It did work before so maybe there is not much difference :)
My comment is very late....sorry.
I've just done my carb rebuild.
The accelerator pump diaphragm was indeed replaced upside down in the video. I hope it worked!
Also, the O ring on the accelerator pump jet can't have been there in the first place as it doesn't need one.
Having said all that, I love your presentation and am a happy subscriber!
@@tapster15 I caught both of those myself lol. I decided to read the comments to make sure im not crazy
Hello - my manual says I need to remove the gas tank to remove my carb, is this true? 2000 softail.
phishshtix34 Hi phishtix, I don't think so... on my bike i do it without removing it...
Great video, do you have the carburetor rebuild kit number? Thanks.
+1970PMD you can check out our friends at +CV Performance they have everything you might need: www.cv-performance.com/harley-cv-carburetor-parts/
Any tips on how to place the membrane spring easily?
I didn't have any problems setting it in, what problem do you have?
I have never seen an o ring on the accelerator nozzle, is that specific to year? Thanks!
I actually thought it was going to seal the nozzle but it doesn't. So it was removed afterwards.
+Custom Cez was that o ring supposed to go on the fuel mixture screw??
Awesome vids man :D even when im checking them 9 years later xD may somebody help me out? I cleaned my carb in vulcan vn 800, and now it works only on choke xD ideas where shoukd i check?
The way to properly test the actuation of the CV diaphragm is to hold the carburetor up with the inlet throat facing you and with a blowgun, connected to an air hose, blow air into the carb throat and diaphragm inlet port as you wave the blowgun back and forth past the face of the carburetor. You will see the slide gradually rise and fall as the increase in pressure rises and falls. DO NOT blow directly into the diaphragm inlet port as you burst the diaphragm with excessive pressure! By the way... I am a Harley Davidson Technician by trade and do it for a living so I know exactly what I'm talking about.
I put my pie hole to the upside down smile hole and puff works the same
Great video! Too bad i didnt see this before I went to Rome, I would have loved to stop by. I didnt see many Harleys while I was there, how popular are they? Id like to know before I move there.
+tommyboombotz hehehe, yea we got a lot of HDs around here, especially in Rome were the weather is so nice :) a bit more pricy than in the States though, not really a "blue collar" bike.
I have an 00 Harley Davidson Sportster xlh883c I rebuilt the original cv carb but I think my float is not set at the right angle.
what is the correct angle?
reason for asking is cause I have fuel just dumping out from the overflow tube.
how do I fix that problem as well?
+firefighter 9/11/01 ciao Firefighter, it sounds tome that you have dirt somewhere in the system that keeps your float open (overflow) but do the procedure from the video to set the float. Check inside the hole where the plug goes for dirt or obstructions.
Custom Cez Fai Da Te check out my video brotha and let me know what you think it sounds off and I keep having the fuel pouring out of the overflow tube.
the was sitting for about 2 yrs from what owner is telling me
OK I adjusted the float and replaced the diaphragm and tricked the idle mixture screw and speed screw and the bike running great. I no longer have gas problem (overflow tube. ) and my oil cap plug is no longer popping off.
thanks guys for your assistance.
you r very welcome :) glad to hear it all worked out in the end :)
i like your style
rise/run = x(100) = slope % in case anyone needs to know how to calculate the slope
where did you get that stolen Massachusetts plate from?
mkelsho not stolen, it was mine :) i graduated from Berklee college of music and lived in Boston (back Bay) for 10 years
Custom Cez wasn't trying to accuse you of anything. In Massachusetts the plates belong to the state... so the only way to acquire one is to steal or report your own lost/stolen
Custom Cez i have my old Massachusetts motorcycle plate that i had lost but found again if you would like to add it to your collection
mkelsho no worries :) didn't think u were. i kept my plates (car and bikes) when i left and sold the veicles. For your plate matter, that is very nice man, i came every summer to boston so it'd be nice to meet and u could give it to me in person :)
Custom Cez ill be about an hour south of Boston... ill hold on to the plate for you. when you are in the states let me know and we can meet
get a s and s super e and be done with carb probs
I got a mikuni and the bike growls now :) what a difference!!!! (here fuel is 10$ a gallon, s&s uses a lot of it)
OK dam ten bucks a gallon damit
k
at least clean holes of each pin
Hahaha You wasted a lot of time cutting a piece of wood and using a caliper to measure the float height! Hold the carb up at an angle, the degree doesn't matter as long as the float is resting on the float needle, without compressing the needle spring, and set the float level with the bowl flange. Simple. People ALWAYS over complicate things unnecessarily.
Thanks for the tips!
your laughing is weirddddd
Hey man, great vid. At 5:11 on the bottom of the screen there is a hole with an adjustment screw inside. Can you tell me what this is for?
Connor R z
First time viewing this vid. I'm guessing you know this by now........ but just in case....... It's the fuel/air mix screw. On this carb, it alters the fuel delivery.