well i fired up the lt80 today trinity pipe gave it a little was hoping for more but enough for my 5 year old daughter i think i need to toy with the jets it has stock in it now it hardley smoking put more in it havent checked plug though. it scared me when i fist cranked with the new piston i took off good and bam got tight and died?????????? what yall think this was after i got it hot. seems to be running lean to me

 

I'll bet that you used a Weisco piston. Correct?
What size piston?

 

I replaced my top end with a wiseco and did 4, 10 minute heat cylcles before I even took it for a ride. It was tight for a good while and is only now starting to run like it should (10 rides later). You really need to let those wisecos warm up REAL good before riding. I'm a big fan of wiseco pistons.

 

i used a thirty over wiesco piston is that the prob

 

It shouldn't be if you had the cylinder bored to fit the piston.

 

I feel it is the problem. A mighty common one on a LT80. At .030 over you had no choice but to go the Weisco route.
Take it apart and sand the aluminum off the cylinder and sand the piston below the ring gaps. Sand any other squeezed spots (lightly).I've had to do this 1 too many times.
Put it together and hot/cold it a few times, then run at 1/2 throttle for 5-10 minutes.
Weisco's call for .003 clearance, I've found that .0035 is ness.
It'll rattle, but it'll run. [img]i/expressions/face-icon-small-smile.gif[/img]

 

It might be the wiseco but not because it .030 over. My wiseco does just fine. Guess I got lucky????

 

i did a lt 80 here 3 weeks ago and i had the machine shop give it 3 thouance clearance no piston slap and it works great. normal ride and brake in i dont know if they need to be closer but it been fine hope this info helps
32:1 mix

 

well hadnt had the problem no more runs better now than it did guess it needed a little run time lol thanks for the help