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38,589 Posts
welcome to the forums. first, you need a 17mm allen wrench, ( this has been covered many times on here, a quick search would tell you this ), the motor does not have to come out to change the cam chain. drop the rear swing arm, then you can get the case off. you will need some yamabond or hondabond to seal that case back up, the pull starter calls for a gasket if i'm not mistaken ?.