4stroke motocross and off-road

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11/14/2018 6:37 PM

Hiya, I bought the book too learn but have struck confusion, simply put re. Carburettor jetting, is wind up richer or leaner? The basics I bought the book for are missing!!
Also re. Exhaust pressure waves, page35 states a positive pressure wave is returned to the combustion chamber, then, page39 states a negative pressure wave is sent back to the combustion chamber,
So, hard to read as a learning book and I've only just browsed.
So, Eric Gorr, can you write and explain how too interpret these issues, I really want to learn the basics of tuning, cheers, Dean Rask, New Zealand