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I personaly have had 0 issues with pro X, Thats what i ran nin my ktm 200, pro-x and vertex(same thing). http://www.ebay.com/itm/ProX-Pro-X-Top-End-Piston-Kit-Kawasaki-KX-250-1993-03-/261195120080?pt=Motorcycles_Parts_Accessories&hash=item3cd0713dd0&vxp=mtr
I personaly have had 0 issues with pro X, Thats what i ran nin my ktm 200, pro-x and vertex(same thing).
http://www.ebay.com/itm/ProX-Pro-X-Top-End-Piston-Kit-Kawasaki-KX-250-1993-03-/261195120080?pt=Motorcycles_Parts_Accessories&hash=item3cd0713dd0&vxp=mtr
