212 falling on its face

[Umax99*]

What makes a 212 Predator fall on its face after about 15 laps. Now I’m not driving the kart but my son says it just seems to start running out of power. I can see that karts start pulling away or passing easily. Two different engines seen to have acted the same. These are NOT a hemi.

It is a stock 212 with a wienie pipe, 31 jet and 10.8# green stripe springs. Governor and low oil sensor removed.

Now he ran a BOX STOCK hemi with nothing done but a big pipe and he said it runs better than both of these other engines.

I have had this happen to me and have seen it a time or two. The temperature gets too high on these predators the motor falls off. We try to stay under 400 for sure but under 380 is ideal.

 

[fast42racer]

The engine was ran this weekend with a different fuel tank. The engine ran just fine. The original tank was a floor mounted. My son put the Phantom upright steering shaft mounted tank and the engine ran the whole race with no fall off. I had asked about the temperature, but that wasn’t it. Thanks for all help.