Carbs cleaned and Synced... still popping

[paccepounder]

Hello everyone.
The bike is an 86 VT700C with about 56K on the odometer.

I had the baffles out for awhile, and I put about 5k on it like that. I got tired of the carb issues - so I replaced the exhaust with the MAC exhaust that claimed it did not need to be jetted.

There was a lot of backfiring with the MAC exhaust, so I brought the bike to a guy I trust - who cleaned the carbs, and even shimmed out the needles a little to make it run right. The bike idles great, sounds great, has plenty of acceleration, just pops very badly when in gear and deceleration. If I rev it in neutral - it is fine. Just when in gear. The guy also synced the carbs (again - I trust this gentleman and he uses the proper tools to do everything).

So I am at a loss, it may be set a little lean? Not sure where to even start on this... but the popping is loud and annoying.

Thanks again!

[page62]

It sounds like the idle screws are set too lean. Each one should be turned out a bit to richen the idle mixture...

[adlowe]

Originally Posted by page62

It sounds like the idle screws are set too lean. Each one should be turned out a bit to richen the idle mixture...

Yup. Clean and synch all you want, if you don't enrich* the air/fuel mixture you won't get rid of the popping.


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* Moving to Denver -- or a higher altitude -- might do the trick. But I think turning the screws out is a little less of a challenge.

[paccepounder]

Thanks. Hypothetically - if I knew nothing about motorcycle mechanics, and never really worked on a carb before, how would I do that? I know I found a guide here before... but I am having trouble finding it once again. Can someone help a newbie out? Thanks in advance.