Originally Posted by kidDynomite

Good info Tom, you weight weenies might also want to lighten the spur gear housings. I always wondered why the pulley adaptors were so bulky.

Anyways, if you're intesested in some MTX-3 mods that you'd like to try on the 4, check out Arnaud Buffat article at:
www.rcinfos.com.
Go to "Techique"
Scroll down to "Competition preparation of the MTX3 Arnaud Buffat".
You'll need to Babelfish it (french to english).

What I thought was really cool was the dirt ejecting pulleys. They worked great on the Kawahara alum pulleys I tried 4yrs ago. I just don't like alum pulleys though. But after your run, you could see the crap coming out of the holes. Belts seemed to last a lot longer too.

I've seen factory guys in GP and EP, that have done tons of light weight tricks to their rides. Most of them you'd never even notice. And people think that they're totally stock.