View single post by Judson Manning
 Posted: 06-30-2008 02:34 am
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Judson Manning



Joined: 03-14-2005
Location: Atlanta, Georgia USA
Posts: 406
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 Generally speaking, everything aluminum used on the 907 is very soft including the cam sprockets.  Early sprockets will be shiny and a definate wear pattern will be visible on the teeth.  The more the wear, the less grip = BANG! time for a new set of valves.

Later cam sprockets were of another (harder) aluminum alloy or treated with a hard anodized coating.  Of the ones I've seen, they appear dark grey or gunmetal in appearance similar to the HTD variants. 

I say 'later' but I recently saw a GT with shiny sprockets...