exhaust leak

[joe smith]

I was reading one of the articles on carbs and someone described a problem of backfiring after closing the throttle down.
He was given the advice of looking for leaks in carb boots vaccum lines and exhaust . I have the same problem and also mine still wont idle. Ive checked the boots and vaccum lines and they are fine. How do I check the exhaust???

[JP]

If it won't idle then you need to balance your floats and sync your carbs first.

[joe smith]

The carbs have been rebuilt and synched. I haven't checked the float level though

[Mike Hart]

rebuilt and synched by who? If not you, then you have no idea what they did. Pretend it was never done.

See here for an example of a 'carb synch' by a dealer...

bad synch by dealer

[joe smith]

Me and a friend of mine synched them but the guy who gave me the bike rebuilt them. I think I'm gonna pull them off and take a look to see what was done. Check the floats etc etc

[Mike Hart]

Won't idle...

The idle screws can get their tips broken off in the passage that allows them to do their thing - if that has happened, you'd have a hard time getting the bike to idle. Or maybe just crud, there, or in other places.

Check out Idle Mixture Screw - Broken Tip Removal