Hey, nice to see this thread revived.
I missed your last question: Royal Enfield used an exhaust cam for the intake on high performance engines.
There was also an intake cam sprocket used for improved performance which had the woodruff keyway cut to provide advanced intake timing. This sprocket was marked with an "A" stamped on it.
The Interceptors were supposed to be available in three states of tune; the lowest used the original intake and exhaust cams, the middle one used two exhaust cams, and the highest state used the two exhaust cams as well as the advanced intake timing.
It' s possible that some of the 700cc Indian models had similar tunings.
Oh, and I rebuilt my Interceptor engine with no ill effects without re-coating the inside. I didn't know any better back then. I'd do it differently next time.
Btw, a repair in the oil tank due to a broken drive chain is apparently pretty common, I have two old crankcases with similar patches welded on.
caponerd screwed with this post 11-28-2012 at 08:20 PM