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Discussion Starter · #1 ·
Just rebuilt my 04 f7 efi 250 miles ago and now it burned down both pistons. Had oil to the oil pump but didn't bleed the pump. I was adding oil, so it was using oil and was also premixing. Wondering if it could be a bad fuel pump or if anyone would know what it could be? Sled would also sometimes dog out at 7000 rpms, so I am assuming that is a power valve issue or if the two could be related.
 

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Discussion Starter · #5 ·
It was using oil, and other sleds filled up with me. No pic of piston, but they both were blowing holes down the center until one gave out on one of the sides. Exhaust was grey and clean all the way to the can.
 
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