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It sounds to me like the springs are opening just barely too quick...a larger pilot jet would probably push a richer mixture into the transition area and solve the problem. It's easy enough to try.



Yes, we're on the same frequency about the springs & pilot jets. I'll probably try 45's just for grins. It could be enough for my 865...

With the 42's & the pilot screws 2 turns out it is just a tad rich at idle. I'm thinking that the pilot screws in a bit will compensate for the idle mixture (if necessary) & a fatter pilot will improve the transition.

FWIW the peak (uncorrected) dyno numbers were 54.62 HP & 51.23 Torque, respectively; that was with a relatively "cold" motor on the run with the current carb tune. There was probably a bit more to be had with a warmer motor, but time was short. I'm much more interested in achieving favorable A/F under load than I am with the peak power & torque #'s anyhow.

The 865's don't make anywhere near the HP of a good 790, but they do make better torque where it is most useful on the street. Of course a BB with good cams, pipes & carbs will blow both away. That said, I want to optimize what I have & enjoy it for awhile before I do a BB.

Given the snow & ice outside now, the tuning will have to wait.