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There's no other way to counterbalance your engine power other than transmission adjustments! The affordable and easy-to-install front sprocket for your mini should be the first performance modification on your to-do list! This is the 428 pitch size, which is a larger size sprocket that requires the 428 chain and rear sprocket to complete the 428 size chain and sprocket conversion.
This is the 428 size front sprocket aka countershaft sprocket. This is an upgraded conversion size, so you would also need to purchase the 428 rear sprockets and 428 size chain as well.
Easy to install and highly effective, these front sprockets for Honda Grom CUB Monkey 125 will allow you to accelerate quickly or achieve higher top speed! OEM sprocket size is (15-tooth for the Honda's), going down will give you more torque and acceleration on the low end, however adding another tooth will slow down your acceleration in return for higher top speed (usually recommended for larger displacement engines).
ENGINE FITMENT with 428 Chain: