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Message: [QUOTE="David Trustrum, post: 155485, member: 21529"] Oh dear, oh well the main screws into the needle jet. The needle pokes into it right. These can’t have been cheap. The pilot is the little biddy one down the hole to the side of the main. Remember jets are responsible for their relative THROTTLE position, not the revs. The pilot will affect from closed throttle -cracking it on. After that you are into the realms of the slide then the needle & needle jet. Full open is the main’s domain. Chances are they set them up rich as too lean can fry your engine so try rich first then lean. Make one change at a time. Chant that bit about throttle position for a while & it will all make sense. [/QUOTE]