400EX bottom end

I've heard of some guys swapping out 400EX bottom ends to get electric start, but that the gear ratio is different and it also has a reverse gear.


How exactly does the reverse gear work? Does it replace 1st with reverse, like you click down to go into reverse?


How different is the gear ratio? Good/bad for street use?



Thinking of doing a big bore and either swapping in a 400EX bottom end or just the crank part.



I just used the crank and gear from the trx had to spilt the cases anyway and I heard you need to move mounts to fit a trx bottom end.

Oh I thought it bolted right up. Definitely will just do the crank and starter then.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now