400ex calculator or so they call it. anybody know the exact rpm rev limet and the back sprocket?

 

If you have the power, and the bike that can rev high enough, one tooth up on the front will give you 5-8mph.

But going up on like a stock bike, will lose speed because the gearing will be too tall for the power.

 

I got up to 69MPH on the 400ex. Maybe 70, but with the GPS it read 69MPH. And this was a brand new one.

 

w/my mods and stock front sprocket...80ish

 

I recently ran my stock 400ex up aside a truck and my friend said his truck was doing 70. But he also said once his speedometer hits 60 its off by about 5 mph. So we were doing about 65-68. The bike was wound out hard though...