if i put a rev box on my z 400 will it be able to pull the extra rpm on top end, and does the extra 1000 rpm give it a boost in top speed. if it cant pull the rpms on top end with stock gearing will a 13 tooth front sprocket make it pull the extra rpms since its lower. according to the mph calculator it says with stock gearing and rpm it will do 69 mph, but with 1000 more rpm and a 13 tooth front sprocket it says it will do 71,but i should also have more acceleration right .