CV carbs
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upho366
- Regular
- Posts: 47
- Joined: Fri Oct 22, 2004 10:02 am
- Sex: Male
- Location: Irvine/San Francisco, CA
CV carbs
my bike has dual constant velocity carbs on it, and i was wondering if there would be any way to tell if the diaphragms in the carbs were messed up without taking off my carbs.
currently fixing my bike: 1978 Honda Hawk CB400T, orange
if my bike still doesnt work well after, might get: 1985 Honda Sabre VF700S
I'm from San Francisco, CA
going to UC Irvine
if my bike still doesnt work well after, might get: 1985 Honda Sabre VF700S
I'm from San Francisco, CA
going to UC Irvine
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TechTMW
- Legendary 2000
- Posts: 2045
- Joined: Fri Mar 19, 2004 12:43 pm
- Sex: Male
- Years Riding: 10
- My Motorcycle: 2005 BMW R1200GS
- Location: Alexandria VA
If you snap the throttle and the bike responds slowly (revs slowly or sounds like it's missing on a cyl) then you might have a torn diaphragm.
You can also remove the aircleaners and look into the carbs while the bike is running. Snap the throttle again, and both slides should rise at the same rate (Relatively, assuming your valves are adjusted and your carbs are synchronized)
Or ... you can take the caps off the carbs whilst they are still on the bike. You may or may not be able to do this depending on your frame. If you can't get the screwdriver or allen key (whichever yours takes) at a 90 degree angle to the screws holding the cover on, you run the risk of stripping the screw, so you will just have to take the carbs off. also, if you take the tops off and pull the slide out to inspect the diaphragm, be VERY CAREFUL with the jet Needle. If you bend it, it's toast. (Be especially careful when you put it back in the carb - it has to slide down the needle jet perfectly - there should be no resistance.
You can also remove the aircleaners and look into the carbs while the bike is running. Snap the throttle again, and both slides should rise at the same rate (Relatively, assuming your valves are adjusted and your carbs are synchronized)
Or ... you can take the caps off the carbs whilst they are still on the bike. You may or may not be able to do this depending on your frame. If you can't get the screwdriver or allen key (whichever yours takes) at a 90 degree angle to the screws holding the cover on, you run the risk of stripping the screw, so you will just have to take the carbs off. also, if you take the tops off and pull the slide out to inspect the diaphragm, be VERY CAREFUL with the jet Needle. If you bend it, it's toast. (Be especially careful when you put it back in the carb - it has to slide down the needle jet perfectly - there should be no resistance.
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