Quote:

Wolfster,
My butt dyno is not that acurate, but I will ponder to guess between 5-10hp increase. Don't hold me to it. The power is just way more effecient and quicker. We'll see....
I will add though, that the guys in the high perfromance bonnie groups are getting 80+, without cams, but with the Mikunis. I have previously run the Mikuni 42s before, but the cams added MORE than the carbs did according to my hinnie.



Hey Pat,
didn't you have trouble with the 42mm Mikunis previously? IMHO they are too big!
Read somewhere that the 40mm CVK on Harleys are good for up to 80hp.
The 2 36mm CVK's on our bikes should be sufficient?
Have you drilled the slides on your CVK's?
Have you considered 35mm, 37mm or 39mm Keihin CR's or 39mm FCR's or Mikuni TM 33-36-40mm pumpers which are related to the Mikuni RS radial smoothbore, maybe Sudco has a kit for twins using the RS ro TM carbs.

http://www.sudco.com/cat32/87-106.pdf

I had trouble with the CVK's, after I fitted a 790cc Bonneville exhaust cam to my 865cc Thruxton motor. Idle was very unstable and revs would hang when throttle was blipped from idle, which was set @ 1000rpms.Thanks to your suggestion, Pat, I linked the manifolds and the carbs with 5mm vacuum hoses. After checking for vacuum leaks, the only reason, I can think of that was the cause of the hanging revs,is that the pilot air jet, which is on the intake side of the CVK's is bigger on 790cc Bonney CVK's. This jet is not removeable. But the problem is still there if the idle is set to more than 1100rpms, I keep idle @ 1000 rpms.
This cam change increased exhaust duration by 16deg, from 220deg to 236deg and increased overlap by 13deg, from 11deg overlap to 24 degrees of overlap. I still have the Bonneville intake cam to fit, which will increase inatke duration by 10 degrees, from 232deg to 242deg and increase overlap another 15 degrees, from 24 deg to 39 degrees.

Have you had any idle problems since fitting the Megacycle cams?

Cheers............Agro