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bike jetting

804 Views 2 Replies 3 Participants Last post by  motoman
my son is going to a motocross race this weekend the altatude is about 2000 feet higher do we go with a higher number jet or lower. Hi bike is a rm 125 1997
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The higher the altitude, the thinner the oxygen. Therefore you must reduce the amount of fuel entering the carb. Smaller jet = less fuel.
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