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Heard good things about Kimpex pistons in 650's, make sure to pay attention to piston/wall clearence with this engine, they like it tight, otherwise will eat pistons.
 

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You can try Kimpex pistons, but they are heavy and not very consistant in their weights. I have a 91 RXL, and have tried Kimpex pistons with only mediocre success. They won't take a lot of VERY HARD riding without sticking a ring or slushing a piston crown.
I recommend Wiseco forged pistons if you ride aggressive, or race. I have been running a set of .025" over Wiseco's for 5 years with no problems. Last season I unknowingly blew out a clutch side crank seal, and still rode 30 miles home. I changed the seal, and rode the rest of the season no problem. I am going to change that piston this fall because it does show skirt scores, but I don't think a Kimpex would have taken that kind of abuse without suffering a complete seizure.
 

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i ran kimpex standard pistons and they where usless , way too much clearence , if you go kimpex , get the pistons oversised to .25 or .5 and borethe cylinder to the piston . dont use the specs in the book.
After running mine for for about 20 miles after a fresh top end the skirts where scored pretty baddly ,
 
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