preditor crank bearings and end play

[cudaman]

My predator 212 has so much crank end play that the flywheel fins are hitting the cover bolts. I want to replace the bearings. Does anyone know the size of bearings needed for a first generation non-hemi 212?

https://www.OldMiniBikes.com/Crank-Bearing-ID-_875-OD-_2_048-Width-_500.html

or

https://www.OldMiniBikes.com/Crank-Bearing-ID-_792-OD-2_048-Width-_500.html

or something else?

Also what cam, valve springs and timing key would you recommend for a mild performance boost?

 

[Newoldstock]

6205 c3 I would think, its written on most of them.
Find a local industrial bearing supplier.
This is a 5 dollar over the counter part ( and that's a premium price ).

The C3 is important, this is a bearing with .003 clearance for high rpm and it provides some slack for movement.
There are C4 and C5 bearings, but you really do not need that.

I am far more concerned about your end play issue.
If you have that much slack in and out I think you should scrap the engine.

How mild?
If your not going to spend any money on it, them I would look at a 14cc head off any old 5.5 GX160 clone
10 dollar part used at a small engine shop.

If you want more speed you need to spend money on billet parts.