Help with Top end....Barrel and head

[crustyYZ]

Hey,I recently pulled my 92 YZ 125 apart and found i had water marks inside the barrel and a bit had leaked into the bottom end.I sprayed teh bottom end with WD 40 to keep it from gettin air in there and screwin up my bearings and con rod and stuff.But i wanted to know if i can re hone my barrel and just put a larger piston i there???...I had the barrel re-sleeved about two years ago so it should be ok to re hone it hey??...Please help, as im lost with out my bike

CrustyYZ

[Yardpro393]

nope.

your yz has a nickasil cylinder that cannot be bored.

if it is not grooved, take some scotchbrite and scour the cylinder.
it'll be fine.

[ossagp]

I am guessing you could have it honed and go back with the same size of piston. or you could rebore if there is enough "sleeve" left.