Hi. Yesterday morning, I got out on the track, ran for about 5minutes and then when I braked just before a hairpin (after a straight, doing about 14k rpm) the engine just cut out. We were running a 158 jet, which was a bit lean, but it wasn't missing or anything, I could just tell it was a little lean (pulling the choke resulted in an ever so slight increase in speed). We decided that wasn't the cause because it wasn't missing or anything and the seizure was so sudden. Our initial thought was that we hadn't fueled up enough, and that when we were braking into the hairpin the fuel was being thrown to the front and starved the engine. This could be the reason, although we are starting to doubt it. Rang up Ogden and steve sounded surprised.
When we took the plug out, it was TOTALLY white, not a drop of anything on it. This is another reason why we don't think the jetting was the cause.
We've sent the engine off to Steve, and hopefully it hasn't damaged the barrel.
We can't think of a reasonable explanation for this, has anyone got any ideas? We'd like to prevent it in future.
One thing we did think of was carb ice? I mean if there was water in the carb, could it have ended up being super cooled, creating ice and then when I came off the throttle, cutting the fuel flow and starving the engine?
1 other thing, a reason why we doubt the "not enough fuel" theory is that the float bowl was full and there was fuel in the pipes after the seizure.
Any help/ideas would be useful thanks!
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