carb slide movement
09-30-2009, 10:52 AM
#1
Senior Member
Superstock
Thread Starter
Join Date: Oct 2008
Location: Muskego,WI
Posts: 388
carb slide movement
Should the carb slide snap back and make a clack (say half throttle movement) or should be be gradual and poofy (??).
this is when the bike is off and carbs on the bench.
basically fast or slow on the carb slides?
this is when the bike is off and carbs on the bench.
basically fast or slow on the carb slides?
09-30-2009, 11:45 AM
#2
COBB Member
Superstock
Join Date: Jul 2009
Location: NorthEast Connecticut
Posts: 292
Not an expert on these CV carbs, but, I did remove mine for cleaning and internal inspection on what I had in there for jetting. I removed the diaphragms so I wouldn't mess em up with carb cleaner and to shim my needles (found after mkt. 5 notch ones, with clip on center BTW), on reassembly, I checked em for function and one of the slides snapped back hard and one landed soft like with a sound of air being displaced, pulled the lid on the fast one and found that I didn't have the diaphragm captured in the rabbet correctly. Foun that if I held the slide open about 1/2 way with a dowel it was easier to get it in the groove right. after that both slides landed soft, not slow just soft. Reassembled it all, synced the carbs with my yard stick manamometer. runs sweet. hope this helps, I'm sure the pro's on here will jump in also.
09-30-2009, 12:14 PM
#3
Senior Member
SuperBike
Join Date: Jul 2005
Location: MN
Posts: 1,548
on the bench, if you reach in and lift the slide through the throttle body, they should drop gradually, reflecting the vacuum created by the diaphram. should fall equally with each other. Its not very slow, but its like a screen door with a damper vs. a door without one. If not you could have a tear or installed the diaphragm incorrectly.
09-30-2009, 12:41 PM
#5
Captain Chaos
Squid
Join Date: Sep 2009
Location: Central Pennsylvania
Posts: 32
I work on harleys for a living, although the carbs are very different then the ones on my hawk the rubber diaphragm type CV's should all work similarly and the trick I used along with the push it up and see how it returns method, is to blow into the atmospheric vent hole(the tubes that go into the airbox on the hawks) and see if they rise at the same speed, it baicly simulates what happens when you whack the throttle open...
09-30-2009, 02:09 PM
#6
Banned
MotoGP
Join Date: Aug 2007
Location: Lake View Terrace, CA
Posts: 5,942
on the bench, if you reach in and lift the slide through the throttle body, they should drop gradually, reflecting the vacuum created by the diaphram. should fall equally with each other. Its not very slow, but its like a screen door with a damper vs. a door without one. If not you could have a tear or installed the diaphragm incorrectly.
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