KDXRIDER.NET

[OK so i have a 85 kdx 200 was running great then dummy ol me thought it would be a great idea to pass all my buddies flying on a paved road well then the bike comes to a halt like I held the kill switch long story short this happens and I know it is bigger than normal sized piston and would like yo find a replacement . it's not letting me load an image but the markings say 8287G and tho other one says W969P4 appreciate any help thanks

Something was wrong. You should be able to go WFO on any engine for an extended period of time provided it’s jetted properly and in good mechanical shape.

Welcome to kdxrider.net. Who did the big bore? Eric Gorr or Klemm Research (i think it's called) may have it.