Alanmurphy6912
ArboristSite Operative
So I bought a husquvarna 335 xpt in running order,poorly running but at any rate it's never been rebuilt as far as I was told so I tore it down and put a new little red barn piston and ring in it and sealed the cylinder with motoseal as instructed and put back together. When I torqued down the cylinder the piston seems to be catching or hitting on the cylinder head area. I checked squish with the smallest solder I had and it about pinched it off. It's coming out to like .0014. So I thought maybe this piston is wrong. Measured and is identical size to the oem I pulled out of the saw. So I then ordered an entire new old stock piston and cylinder kit from husqvarna and to my surprise the piston and cylinder bore are larger than my original. So I assume it's for a 338. At any rate all seemed same so I put it back together with the now the new oem piston and cylinder kit and this time put a thicker bead of moto seal on it and let it just about dry over night as to make a thicker gasket. Still hits the cylinder head I think (you cant really see inside the cylinder) so I'm now at a loss and sorta baffled on what is happening or what to do. Any suggestions or anyone who has been through this I'd be super grateful for.your advice! And yes the piston is faced correctly and the crank put in the right direction etc. Thanks in advance