I have a 84 trx 200 that runs ok. My question is that it wont idle until the engine is warmed up. It must run for about 5-10 minutes before it will idle on its own. The compression is 120 psi. but still seems to lack power it should have The carbs were just rebuilt fresh gas. The idle screws were set when the carb was rebuilt by a mechanic. they did say that i could use a new cam chain? could this be part of it? maybe timing? like i said it will not idle until warm and the has good compression and the carbs were just done? any ideas. I dont know anything about it so any help would be good.