oh no i'm starting to have flashbacks:( this is what i was going through i think. get the bike in front of you and give LM a call:)
James
Another issue... points cam orientation.
The cam sprocket was, indeed, upside down. Everything else was okay. I just did valve timing on the exhaust stroke and made sure the ignition cam was still properly oriented. As I said, it runs like a champ. Already did the valve clearancing and just have to perfect the ignition timing once its all broken in a bit better.
Update:
It blew up... FML. It seems it dropped a vave-- the one part of the engine I, personally, did not assemble. I'll have a speaking to with the guy that DID build it. I had a fantastic set of NOS race pistons, one of which now has a massive hole in it. Awesome. So about $1000, 10 hour of my life, and only 20 minutes of run time on this motor in break in. I haven't even SAT on the bike yet with the new engine! A high-end prostitute has better return on investment than this Superhawk at the moment. As I said, FML. I'll keep you guys posted, I'm sure I'll need some help... and money... but I promise I'll only ask for the former. That's a bummer. Did the head drop off an exhaust valve or did it pull through the collets?
Two piece exhausts are prone to dropping heads at high RPMs on race bikes but I haven't heard of them doing that on a street motor unless it was ridden really hard. Rubber cam chain tensioner wheels break up and cause all manner of destruction but not on a rebuilt motor - unless it was an old wheel. Hmm. I'd be very interested to see the pictures of the destruction to see what went wrong. What was happening when the valve dropped? Was the motor revving like a banshee or cruising along quietly? What sort of revs had it been run to and what valve springs did it have in and were they new or used? Stock springs lose tension and cause valve bounce and valve bounce causes heads to drop off valves.
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