about 100-120 km/h
With stock gearing around 63 mph
With stock gearing 63 mph
no.
60-65 tops with stock gearing, a motocross bike is not about top speed but how quick and how well it handles.
90-100.
with stock up to 85mph
135mm (80-150)
stock 189 mph
A stock yz125 produces 33 horsepower, new. As the engines get older, the valves, rings and other components wear. This will cause horsepower to drop.
stock gears around 75-80mph
With stock gearing around 63 mph hey kid your worng I have one and it goes 81 mph trust me I know what I am talking about! mine goes 87 with a fmf titanium 2 and fatty my yz125 with fmf shorty tail pipe and a pro circuit header i clocked it out at 84mph! and with my BRAND new topend and cylinder and power valves 88!