Serowbot wrote on 08/01/09 at 10:34:35:Here's a way to test the main....
To test the main, accelerate from 30 or 40 mph, in 4th or 5th gear at full throttle for several seconds, then reduce throttle by about 1/8,...if power increases for a second, you are lean on the main jet. Go up one jet size and test again.
I've tried that with 145, 152.5, and 155. Never noticed a change in power.
So far I've ridden with (Dyna exhaust):
55 pilot (1 turn out) / full spacer / 155 main
55 pilot (1 turn out) / no spacer / 152.5 main
55 pilot (1 turn out) / half spacer / 152.5 main
55 pilot (7/8 turn out) / half spacer / 145 main
Full spacer left me a weird surging condition 1/8 to 1/4 throttle.
No spacer fixed that, but killed my mpg.
Half spacer leaves me with a weird surging condition 1/8 to 1/4 throttle, but only when the engine is cold.
I just finished installing a 150, so I'll let you know how that goes.
Update:Well, I guess I never hit "Post". It's now a few hours later and I just got back from a test ride with:
55 pilot (1 turn out) / half spacer / 150 main
There's a difference between 3/4 throttle and WOT now. Not a huge one, but I can feel it.
I guess the next step is to retest 152.5?
-D. Dwarf