LT80,

I have been reading your post from several fourms I need your help, I picked up an LT80 from a guy for free he said it needed rings, no compression, tore it down and checked it out a chunk was missing from the piston, and the head had gouges in it, ordered the head cylinder and top end kit, waited a week today got all the parts together, rebuillt it rode it for an hour wouldnt start spark plug was wet and it was firing, just tore the top end down, a two smaller chunks missing out of the piston and gouges in the head???? Both times it was by the rings, this time the cylinder wasnt ruined?!?! What now Im stumped it was running fine?!?!

 

Sounds like it was bored out and somebody never chamfered the ports. Feel the edges of the ports and if they are sharp take your dremel and round them off.