I have stood right in your shoes and it's a serious, no BS deal starting and warming a nitro engine. I just hate it when it doesn't want to light at the starting line. No turning back then. If it doesn't start, you have no choice other than go through the clearing out process and try again. You just can't crank and start these engines on nitro alone, the fuel is too unstable. We use gasoline in the pits to light it and warm with alcohol for 90 sec. to 2 minutes, then switch to fuel. Starting line, lots of gasoline, as soon as it lights, go to fuel before the gasoline runs out. After 5 years, I am getting pretty decent at it.
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