My beautiful Kawasaki KX250 runs a flat top piston. Do you think I should use...

[Stalin]

...a hotter plug? McGrath was using BR7ES in his 1996 Honda.

 

[Irrelevant infomer]

Depends on your timing, whats the timing at? hot plug miss timed you'll blow a piston ring.

 

[John M]

buy a new one

 

[maddog]

you could try using a butplug,they make the exhaust smell funny though.