Entire engine rebuild

[Andrew1234]

I have a very old pk80 and I wanted to restore it because I want to have a 38mm crank engine again and I was wondering what crank bearing I would need and that would be of high quality

 

[cloakedvillain]

Don't bearings have engraved markings? If not, calipers will work to find the inner and outer diameter. You will want unshielded bearings rated for at least 7000k rpm.

 

[Andrew1234]

Don't bearings have engraved markings? If not, calipers will work to find the inner and outer diameter. You will want unshielded bearings rated for at least 7000k rpm.

I gotta get a higher rating then that I plan pushing this engine to at least 11k but obviously with a very well balanced crank

 

[Wrench]

C3 rated bearing will be fine

 

[Deleted member 35519]

Don't bearings have engraved markings? If not, calipers will work to find the inner and outer diameter. You will want unshielded bearings rated for at least 7000k rpm.

Why unshielded?

 

[cloakedvillain]

Why unshielded?

How else will oil get into the bearing? Gasoline is a brilliant solvent and those bearings will run dry.

 

[Chainlube]

Why unshielded?

On the piston side, other side should have a seal.