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flyer05

Wr400 wiseco 13.5 piston

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Hi, I did a search but did not find what I was looking for. Can I change the stock piston with a 13.5:1 Wiseco piston ?

part# 4650M09200

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I put a 13.5 wiseco piston in a mates wr450 (YZ cam and pipe)and he loves it.I'v got one for my wr400(YZ timing,yoshi) ready to pop in(it does say '99yz on the box but should be ok.

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Okay got the piston kit in hand. Do I have to hone or not ?? The instructions say to set the clearance as printed on the box ? Hmmm also says not to ball hone it.

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Okay got the piston kit in hand. Do I have to hone or not ?? The instructions say to set the clearance as printed on the box ? Hmmm also says not to ball hone it.
If you can still see hone marks on the cylinder, I wouldn't. :bonk:

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