Urgent Wrist pin question

[750SX]

I got some wrist pin bearings with my hotrods crank for my 701. The wrist pin bearings and washers do not fit inbetween the hole in the piston on my pro-x pistons. Are the washers not needed with the pro-x pistons? I measured the bearings and they are 24mm. I have some kawi 750 bearings that are 25mm so I am thinking of using those instead. Does anyone have any input on this?

 

[WFO Speedracer]

Washers are not needed proceed.

 

[750SX]

should I use the stock 24mm ones or the kawi 25mm?

 

[Matt_E]

For the Kawi bearing you don't need the thrust washers.
For the stock Yamaha bearing (94-present) you do need them.
The 650 motors had wider bearings and did not need them.

So, if you're going to skip the thrust washers, use the Kawi bearings.

 

[750SX]

that's what i was thinking matt, but wedo said with pro-x pistons, the washers are not needed. I cannot fit 24 millimeter bearings in the pro-x pistons with the washers. I'm just sticking the stock bearings in

 

[Talsivar]

Matt what are the benefits of using the washers? i have never used them or known anybody who has, and have never had a problem.

 

[sflsurfrider]

the washers are junk. do not use them.

 

[Matt_E]

Matt what are the benefits of using the washers? i have never used them or known anybody who has, and have never had a problem.

They're supposed to limit movement, I guess.
I use the wider bearings.