Posted September 3, 201113 yr ive fitted a leo vince zx exhaust on my yamaha aerox 50cc including the rollers and clutch springs which came with the exhaust, the rollers weigh 4.3g, im just woundering what size jet do i need to gain maximium performance as its really slow in accelerating upto 40mph then flys upto 60mph. help would me most appreciated.
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