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2001 300 ex top end rebuild

853 Views 6 Replies 3 Participants Last post by  SlammedRanger
I know, I know this has been posted over and over here probably and the one thread I found , that had a useful reply saying that the cam lobes are facing down on TDC is the compression stroke is helpful but im not sure what stroke the bike was taken apart on .. 300 ex that was torn apart already with a replated cylinder and piston and such .. anyways im getting the bike back together finally .. Since the cam was out I have no way of knowing if when it was taken apart it was on the compression stroke or not.. I have worked on tons of cars and all " consider me a shade tree" ... Is it possible to have it 180 degrees out ? does the spark plus fire every rotation no matter what .. ?? thanks for any reponses I get .. I have it properly timed and waiting on a manual chain adjuster now ... but I wanna know if the spark pattern can possibly be off or not ...

Thanks for any help guys !
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The spark timing is taken from the pickup on the flywheel. As long as you lined up to the T and the cam lobes are facing downward and the marks on the cam sprocket line up your good. No other way to do anything wrong. As long as the woodruff key on the flywheel isnt sheered. Your timed correctly.
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No worries! Welcome to the forums btw! Bunch of great knowledgable people on here! With your willingness to learn you should fit right in!
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