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My 87 TT 350 has a problem, it ran great before I put it away for the winter.

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My 87 TT 350 has a problem, it ran great before I put it away for the winter.

My problem is it will only run with the choke on, when I shut it off I have to keep revving the engine and then it is backfiring through the carbs and head pipe. Also the head pipe gets extremely hot melting the plastic around it.

Thanks in advance.

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Thanks for the reply Burned. You gave me the inspiration I needed to remove the carbs one more time and clean all the jets and passages all is in ship shape. I put it back together And the problem is still there. It runs good with the choke on, backfires through the carbs when it’s off. Also the head pipe is still getting so hot that it melts the plastic around it.

Thanks in advance, for any further advice that you can give.

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First, just want to thank Burned and all you guys for all the advice.

I bought some Gumout in a spray can and filled a coffee can with it. I soaked the carb in there for the whole weekend, and then I took it to work and used an ultra sonic cleaner for four hours. I used everything you can think of to make sure all the passages where free of dirt. I put it back together: same damn problem was still there!

So I thought maybe I need to check my intake manifolds so I took them to work and used helium leak detector on them and they were leak tight. I didn’t know what direction to go next. All ignition, electrical has been checked and working perfectly. It has a rebuilt head and the valves and timing is on the money.

I was just about going to give up when I saw a guy selling a set of carbs on Craigslist for a 1988 XT 350 for $40 I got them home and pulled the bowl off to my surprise they were very clean my thought was not to disturb anything on them and see if they would work.

I installed them and the bike ran great at first (until it warmed up) then the same damn problem came back!

Then I got to thinking maybe it had different jetting so I swapped the jets and installed the carbs. Three kicks and that was it, my bike runs great now the only thing I can think of is the infamous internal vacuum leak on the original carbs; MAYBE! I don’t know.

Thanks again to everyone who replied to the post.

CR500

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