when i first get it running it's awsome for about 3 minutes throttle response is great then when it warms up it has a dead spot on the bottom not bad just enough to pi@@ you off kinda like a damb knat is it lean or to rich i saw that some one said to run a 210 main that seems awlfully big need some answers thanks

 

This may sound stupid but have you cleaned your air filter lately?

 

I had that problem with a TB before and what it turned out to be for me was a crack in the oil injecter line. Replaced the line to the oil injecter and it fixed it.

 

for some odd reason when im either going slow or goin down a hill, when i let off the throttle the engine basically shuts itself off. but like ftw said clean ur damn filter then check back in

 

i know exactly what he means. when mine is run for about 20mins it loses power. and then when i shut it off let it sit for about 10mins it has way more response. i think this has to do with the engine being a piston port engine but i could be wrong.