i was given 2 1985 enticers one used as a trail sled and the other as a racer, i took the motor from the racer and put it in the chassie of the trail sled because the motor on that was seized. when i start it up it runs fine for about an hour and then only wants to go really fast when i try to ride easy it acts as if it has fouled a plug, idols fine but when i hit the gas she boggs out a friend told me it might be the jet setting but i have never messed with those before. Plugs are a nice coco borwn any help??