FX-1 Pro x pistons question

[Asmbandits]

Do Pro X pistons require Pro X pin bearings or will any oem size equivalent bearings work? Blowsion sent me kawi bearings instead of yami but brand new non pro x pin bearings came with my oem rebuilt crank so I would just use them if I can.

 

[SUPERTUNE]

Yes, Use the Kawasaki bearings, it's wider bearing to support the wristpin more than the Yamaha one.

 

[Asmbandits]

Ok, I see now that they fit but I have another question, If I use the kawi pro x bearings there is no room for washers, the piston kit did not come with washers but the pistons that were removed did, do I need to run the slim washers ?