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Will do. Probably be Sunday before I get a chance to do it.

Can the frame be straightened Mga ? I've straightened frames before. If they are bad we cut and then bend the tubes then weld them again. If it's just the entire frame a bit twisted they can be chained to a tree and tweaked using a long length of lumber and/or a come-along. The wheel alignment is nothing near as important as in a road going vehicle.

Partzilla have changed their layout.. here's what they say are directly interchangeable. 2001 YFM400 Big Bear 2x4 YFM400 Big Bear 4x4 2000 YFM400 Big Bear 2x4 YFM400 Big Bear 4x4

Look the frame up in partzilla and it should tell you what other models it fits.. which are also the other models that will fit your bike.

Thats a big job, never could get it right. Im not sure about frame swap, i know the 350 was different the battery holder was down next to the rear tire. The 2000 big bear 400 was the first year and i think it changed fairly rapidly on the early models, im thinking maybe 2000-01 were the same and then there were some changes but maybe not in the frame. I havent been able to find any information on that yet, but im looking.