hey this 86 zx1000r has a muzzy exhaust 4 into 1. anyone have any ideas about the jetting and mixture screw settings? any good websights? will this exhaust system have a particular jetting? the bike runs good at high rpm but it seems to surge when just cruising below 4000 rpm any ideas???????? thanks for all the help you've given me so far

 

Dynojet

They have great tech department and can help you with the correct jet kit.