400ex stroker??

[outlawchico151]

Has anyone stroked there 400ex?

[NacsMXer]

Mine's stroked out.......check the sig :D

[Wheelie]

Mine as well.

[outlawchico151]

What parts did you need other then the stroker, was it a real night n day diff?....its for a good friend of mine that has a 400ex and would like to make it fastttterrrr

[Wheelie]

Mine is a +4mm stroker with a 2mm overbore. The crankshaft needs replaced, or the stocker modified, a custom piston is also needed. IMO--an aftermarket cam is a must as is a HD cam chain. Porting the head wouldn't hurt either.

Power difference is night and day. Mine was done over six months ago and I'm still impressed with the power. It'll hang with and beat lightly modded 450's.

BTW--I did all the assembly myself, if one is mechanically inclined and have a good service manual at your disposal it's not difficult, just time consuming.

One final note, the torque of a stroker is demented.:macho

[cory]

I think Powroll will still stroke your crank +4mm and install a shorter "tough" rod so you can use any stock pin height piston.

[Wheelie]

Powroll did my crankshaft work--great company to deal with, killer quality and customer service.

The wrist pin location is the same as a stocker, however the piston skirt needs to be modified to clear the throws of the crankshaft.