Quote:

...I'm guessing I'm too rich. Why do the Bonny riders with 360 engines all seem to run 110 pilots, smaller mains, and more aggressivly tapered needles (Thruxton) but have higher stock HP.....Cams????



I think it's the cams and the 360° timing that affect the numbers more than anything else. My '01 Bonnie ended up with stock needles, 42 pilots and 145 mains, K&N pods and Emgo reverse cones and it ran like a scalded ape. That said, I always felt my America had more power (torgue) across the entire operating range.

Quote:

Most butt-dyno tuned bikes are jetted too rich on the mains.


That's probably true enough since the main jet really only comes into play at WOT and few people actually spend much time there. Truth be told, you could run one of our bikes with no main at all if you never got above 3/4 throttle since the needle does the metering up to that point.