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it depends on your rear tire size and weight.............................
The best sprocket comb for lc135 is 15 37 which the ratio is 2.47
Best sprocket combi for rj 110cc - 14 36
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wht is the best sprocket combination for Yamaha 135 answer: depends on your tire size you use at the back. try the different sprocket gear ratio listed on the yamahat135.com or see the link below
14 - 35
14-43
15t 43t
15-36
12-35 the best
I run a stock rear sprocket and 15 front. does great for 500 ft drags
14-38 is the best sprocket combination, using an iridium spark plug or any upgrade of spark plug. it will surely deliver power and speed. and you don't need to open your engine for more upgrades.