Originally Posted by mcma111
You will never get an accurate measurement on a cam chain. The sure way to check is to install the chain and cam. If the cam drive gear marks line up with the head then the chain is fine. If not and it looks like the mark is about half a tooth off (it's always the forward mark being up) then that right there tells you the chain is stretched. Even if the chain is stretched the bike will still run. The cam timing will just be off a few degrees. More low end.
Thanks, I can put my old chain next to a straightedge and keeping the links in a straight line, change the length of the chain almost 1/4 an inch - and that's just one side of the chain. Also, when I wrap it around the sprockets and pull it tight, it won't line up with the final few sprockets - or, if I hold it tight at the bottom of the sprocket, it is loose at the top. DEF stretched! I did what you said too, and was out by a long way. Just was wondering if there was an accurate measure of new vs. old. I'm assuming it's the pins wearing out in each link versus the actual stretching of metal.