CV carb. problem
CV carb. problem
My '92 EVO CV carb spits gas out the ventura under a load, ie. 70mph in 5th gear. when running easy it doesn't happen. I have tried 3 dif. carbs and they all do the same thing. I have set the float by the book and reduced the float level down a little a couple of times, no change. Any Ideas?
You could have an small air leak aound manifold if this is happening with other carbs. Get some starte fluid, start the bike and sray starter fluid around intake, if you hear a change in ideal speed, you have leak. Keep it away from the air intake when doing the test.
air leak.
Did air leak test and had leak, replaced o-rings and it got better ( less response to start fluid), thought that fluid was migrating to air intake. I now have new filter (K&N) and air box. I'll try it again today. after I finish my coffee. Thanks!
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
Likes: 402
From: Phoenix '53, '88, '09 Big Twins
can also be reversion which is influenced by cam, intake tract and exhaust tract tuning
( basically a pulse of exhaust gasses is coming back up the pipe and through the head in the time that the intake and exhaust valves are open)
this phenomena will be rpm specific
and can be tuned out by changing any part of the exhaust- length, restriction etc.
could also by a leaking accel pump on the carb...this will be less rpm specific
Mike
( basically a pulse of exhaust gasses is coming back up the pipe and through the head in the time that the intake and exhaust valves are open)
this phenomena will be rpm specific
and can be tuned out by changing any part of the exhaust- length, restriction etc.
could also by a leaking accel pump on the carb...this will be less rpm specific
Mike
reversion
As I said before about the exhaust was shortened about 4" I will check into a set of drag pipes today. Thanks for the help, I think this my be my problem,(I HOPE) any way Thanks.
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
Likes: 402
From: Phoenix '53, '88, '09 Big Twins
drag pipes ?
hmm.
do you ride closer to 3000 rpms or 6000 rpms.
drag pipes give up low end for high end power.
base your build and tuning choices on the anticipated use.... I know I spend alot of time near 3000. Not much above 5000
mike
hmm.
do you ride closer to 3000 rpms or 6000 rpms.
drag pipes give up low end for high end power.
base your build and tuning choices on the anticipated use.... I know I spend alot of time near 3000. Not much above 5000
mike
pipes
Well I guess drag pipes aren't what I should think about, my problem is cash I'm trying to survive on SS so I'm limited on funds, I was looking at exhaust systems and every thing is pretty pricie, guess I'll do a little looking around on craigslist and such. I think you might be right, I've tried every thing else that I could think of. THANKS again, we'll get it figured out. :-)>
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Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
This is what was explained to me by a couple of mechanics when I asked the same question.
Road Warrior
Joined: Nov 2008
Posts: 1,595
Likes: 8
From: Vancouver Island British Colombia Canada
Where is your compression? if it's too low, you will get fuel coming back out the venturi. If your main jet is too big, you could also get this effect.
Hatch.