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The engine must be on T2 . That means the right side piston is at the top. And the mark on the flywheel lines up with the tab on the case. It does not matter if it is perfect when you take it apart . But get it close with the cam lines in place. Then mark your chain. The most Likley reason for getting it off a tooth is there is to much slop in the front part of the chain. You need the chain tight around the exhaust cam. Marking the chain will help. Once you turn the motor around the chain marks will no linger be valid.
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