450r piston install help

[culookn]

just looking for some advice/tips on putting in a 13:1. ive done plenty of 2 stroke pistons and i was wondering whats involved with a 4 stroke piston. can i hone it myself with one of those kits they sell at the auto parts store? how much do i gap the rings? anything i should look for? any1 run into any problems? show some pistures of this if you have them avaiable.

[F-16Guy]

The cylinder is Nikasil'd, so you can't really hone it without diamond stones. You can use #220 silicon carbide to break the glaze. Make sure to thoroughly clean the cylinder of and residual grit. The piston should have instructions for ring gap, but a rule of thumb is about .004" per inch of cylinder bore if you can't find the correct specs anywhere else.

[culookn]

so will i need to rehone the cylinder or should i let it go.

[29FTEX]

No need to re-hone, but inspect the cylinder for abnormal wear from the old piston. You should still be able to see the cross hatching.

[culookn]

ok thanks, and the rings that will come with the piston should be gapped already. just double check to make sure?

[F-16Guy]

Originally posted by culookn
ok thanks, and the rings that will come with the piston should be gapped already. just double check to make sure?
Definitely check the gap.