Quote from: Nopick on January 24, 2013, 05:00:29 am

Alright.  I thought I would post this because it had never happened to me before.  The engine revved and I killed it.  At the bottom of the hill, I started it again after checking throttle movement, obvious air leaks, etc.  Same thing, engine revved to the moon and the kill switch wouldn't stop it.  Had to grab brakes and dump the clutch to kill it.

The main jet came off the needle jet allowing the needle jet to move up in the throttle bore.  I assume that was holding the slide up a bit causing the rev.  Can anyone say disassemble a carb at Lizard Hill?

The engine was experiencing detonation as you were going up the hill at partial throttle. I kept saying to myself to stop the engine or change throttle positions before you burn a hole in the middle of the piston. The engine had that horrible lean sound with run-away preignition just before you killed the engine.


As the need jet moved up, it had the same end result on the mixture as leaning the clip on the needle.  If the needle jet moves up 1/8" it would have the same result as moving the clip about 5 notches.

I guess I don't know what detonation sounds like.  Is it detonating in this run as well?