Originally Posted by wadzii

timing doesn't really do that.. That is from a very lean condition for a long time at high loads. Lots of pre-igniton.

Pre-ignition can be caused by detonation from too much timing, but if the tune was "conservative" then I would guess that there was not enough timing, which causes really high egt's which will then lead to pre-ignition and everything else melted.

There is no such thing as a "conservative" tune.. only right and wrong. You either had a really wrong tune or injector failure.

RC750's do not work above 55psi of fuel pressure.... They are absolute junk. If you notice they put a warning on the box.. thats because of me. We lost 3 motors before RC finally fessed up and told us that the injectors were partially locking up above 55psi and thats just how the injectors were and to keep the pressure below 55psi. Those are words directly from RC after we sent 3 sets of 750's back to be checked after 3 blown motors.

Keep in mind that all 4 wont lock up exactly the same. The wideband can still tell you a good afr, but one cylinder be very lean. It only takes one pull to do this kind of damage. Reading the spark plugs wont help you.