update on 400ex "heavy duty cam chains" a must read
i have done some research and found out what the engine builders use as the "heavy duty cam chain" for the 400ex. the cam chain that they sell for $90 to $100 is the crf450 cam chain. the crf450 chain is only $25.68 from service honda. i installed the crf cam chain tonight and it works fine. the timing marks on the cam sprocket line up and the chain fits the cam sprocket just fine. the crf chain has a "U" shape on the top of the side plates and is wider than the stock cam chain. also it has the same "M" markings on the side plates like the stock chain and has the same number of links as the stock chain ( 112 links). the crf450 cam chain is more "heavy duty" than the stock chain. i paid $42.77 for the crf chain, right cover gasket, and shipping. if a engine builder tries to tell you that they are not the same chains think about this, if you where making about a $50 profit from each chain and you might be able to sell 1,000 chains well you do the math. i almost forgot the part number for the crf450 cam chain is 14401-MEB-671.
