Now five pistons????? I am sure Mr.Park would like to see pictures too. Only heard of five K-30 piston failures. Common denominator?

I wrote to Mr. Park he told me that he never heard of it also.But I think that he is not turning the RPM that I am. I believe that I sent him pictures but I will resend them just in case I did not.

What kind of rpm are you turning? Some guys are pushing up to 19,000 with K30's that I know of and I am sure there are builder/tuners out there pushing them faster than that. Would like to know whats causing these failures and it's gotta be frustrating for you.

I have modified it to get 19000 in a 56 inch Apache with a 7016 pitched up propeller and this is in salt water.
Yesterday I ran the Zenoah with the same mods for three hours I did three laps at full throttle and no problem, just as fast. I will be racing this on Sunday.