Well, I have my suspicions, and I am gonna live with them.
Greybeard, the Dynos showed a good mixture with the Thruxtons in and consistant HP at WFO. Here is what I think.
When I got the bike back, it was waaaayyyyy too lean and popping on decel. A/F mix was at 2 1/4 turns which was the proper 13:1 ratio the mechanic was shooting for.
At that setting the thing is a real dog and is obviously not getting the gas necessary when cranked WFO on the dyno. I think this has resulted in the lower HP rating.
When I open her up to 3 1/2 pop goes away and a MAJOR increase in torque and accelleration.
I think if I were to go back and re dyno, I would be in the mid 60s HP...
That's my story, and I'm stickin to it...
I like the Thruxtons and will keep them for now....
Thanks to all.