polaris sl780 checked pistons and found one that had pockmarks around the outer sides of the top. could this be from water. I would think that preignition would be more in the center of the piston i do not know
Preignition will be all over. I know I melted down a ZZ502 650hp in my 23ft Nova Wellcraft. She now 30 over and turns about 680hp with some extra machine work.
1 - 2 of 2 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
A forum community dedicated to PWC owners and enthusiasts. Come join the discussion about performance, modifications, troubleshooting, maintenance, for all SeaDoos, Waverunners, and Jet Skis.