Oh, in relation to engine set-up etc. I think a lot of racers get a bit carried away with it and can be guilty of scaring people into thinking it's F1. I knew nothing about Nitro engines but have learnt a fair amount in a few days. Thankfully I have worked with Motocross bike engine for my whole life so understand the mechanics of jetting etc which is essentially the same with a nitro engine.
But basically a nitro engine is simple and requires small adjustments to get it right. It's not the black art many would have you think, it's just frustrating when you are breaking everything in and trying to get it right. Just don't let others scare you into thinking you need a degree in engine tuning to get a good set-up. You don't.
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