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Author Topic:   what makes a 421
Dirt Full Roller

Total posts: 27
posted October 14, 2002 06:58 PM
ive heard of guys running them just wanting to know what they do to get it thanks

Dirt Full Roller

Total posts: 63
posted October 16, 2002 12:56 PM
i think its a .030 over 400 with and offset ground crankshaft.


Dirt Freak

Total posts: 368
posted October 16, 2002 02:38 PM
3.875" crank

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