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EddieTNT

'05 top and bottom rebuild - What service?

4 posts in this topic

A friend wants me to do a complete rebuild (top and bottom) on his YZ. His cases are broken (chain derailment) so that needs opening for sure. What should I do/look for in the top end? He bought the bike used and from the looks of the bike it has lead a pretty hard life. Should I automatically replace things such as the timing chain? What 4 stroke specific tools do I need?

Sorry in advance for the stupid questions. None of my bikes have valves so I need some educating here. Thanks!

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well...i could try to type out over half of the owners manual for a yz450f or you could just get a hold of one and that will answer about 99% of your questions. The owners manual will be great because it will give you all of the specs and tolorences of the whole engine, top to bottom.

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Thanks Mike, that would be my first step. What I was hoping for here was perhaps a list of likely problem areas inside the engine. I figured people here would have that type of information. I know these bikes are pretty bomb proof, but I thought perhaps there where specifics I should pay extra attention to. Thanks again. The new manual in on its way.

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