Ok.. doing a rebuild on my 01 scrambler 400. Took down motor and crank bearings were bad and counter balancer was tore up pretty good. Cylinder walls were in really nice shape. Purchased all new bearings from bearing supply store.. had the local machine shop resurface the counter balancer and now I am ready to put it back together. I also purchased a new WSM piston kit. (BTW any problems with this piston?)

Just wanted to check the order and direction of the two collars/orings on the crankshaft. I know the outer one goes on before the slotted nut but I was wondering which side of the collar the o-ring goes on the inside collar. Any help would be greatly appreciated.

Also.. any other good tips for reassembly?

Glad to be at the forum.