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Discussion Starter · #1 ·
Hi all.
Just picked up a FMX 650 that’s had a replacement engine.
It came with the old engine that’s got a shagged piston but apart from that it’s in good shape.
I’m looking to buy a new piston and rebuild the old engine.
My question is can I use the same diameter 100mm piston from the XR650L or NX 650 Dominator etc.
Is it the same engine. Or do I have to get a 100mm FMX piston (they seem more expensive). I know some have a higher compression ratio and I’m not looking to raise it.
Just looking to replace like for like.
Thank for your help.
DB348
 

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I think they are the exact same as the Dominator and XR650L.
Have a look through the Wiseco and Wossner catalogues and see if they are the same part #
 
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