ok i raced at otter lake and took first in the 250cc and second in the 250-500 cc and then blew motor. pulled it apart the crank bearings wasted 3/4 inch up and dwn play. question is it was brand new last year ,what would cuse this then it blew my rings. so what to do now that its apart again? the guy who rebuilt my 87 lt250 bottom heard it run month later said i had piston slap bored out and put fresh piston in same vibration same rattle. then i blew it any ideas? thanks in advance.

 

Dude that sucks! Blew up already? At least you won a race first.
Did ya jet it fatter for the cold weather? maybe too lean Are they going to warranty it?

 

ill never go back to csa if he dont ill know later today ill 2way ya. how much ya want for your zilla motor lol j/k

 

i bet the crank was out of balance and\or main bearings bad . i have woundered if the 250 had the same problem as the 500 and need the case inserts . if it vibrates theres not alot it could be . have you checked the flywheel or the clutch hub ?

 

lol im thinking my crank wasnt true also on last bottom rebuild seeings my rings were fine until parts of bearing came up from lower connector rod and my piston beat them to death. cylinder wasnt even scarred. doesnt matter now i just bought that whole 87 paul turner national motor and pipe and carb off ebay. ill part my motor out now i guess lol.thanks again don and freak

 

i saw that motor on ebay . looked sweet !! what did you end up getting it for ?? and no prob on the help . anytime

 

800 shipped for motor pipe silencer pyramid red cage and i hadem throw in steering stem mounts . that bad? or good?

 

good ! it was just recently rebuilt with no rides wasnt it ? if so the motor alone was more then that and the pipe is 300 plus ! so i think you did great !

 

With Hot Rods now making the LT crank I would rebuild an old one. There isn't many people who will get them perfect like they should be. I once had a local shop do me one cheap (like $30) and it vibrated. I know that was the problem.

 

ok im gonna rebuild my old motor for a spare but hot rod doesnt show a crank for the 87 grrrr