considering my set up which is 172 25ml carb and pm59 everything else standard 125 would it be better for me to put my 180 gear box into my engine advice please minro u can help to as usual thanks
if you're hitting top speed quickly and revving the tits off the thing then go for 180 gears, they arent loads taller but slightly taller so shouldnt hack too much bottom end away, doesnt look like you need it tbh