[mystahagy]

Glad to help. These numbers were the result of trial and error throttle feel with an emphasis on staying away from any lean conditions. Over time I may need to tweak it a bit based on plugs.

I also considered compensating elsewhere in attempt to get away from such a small air jet, but so far the bike's telling me it's happy so we'll see what the long term reveals.

 

[mystahagy]

I was also thinking that I needed to go big on the needle jet, and P-8 was the largest I could find so far. There's most definitely improvement to be found in the details.

 

[mystahagy]

Great information in here, thanks guys. Mc69, I'll mention that my efforts started with a primary type needle jet like yours. Idle, off-idle, and midrange performance were perfect, but I couldn't get away from eventually fouling plugs even with the air jet removed. I cut my losses and chose to focus on tuning with the more preferred bleed type needle jet.

 

[mystahagy]

Here's some followup after some more seat time. Never got a slight hesitation or miss, but I'm a perfectionist. The 30 pilot provided instant cold starts and ample power from the get go, but showed signs of richness with an idle rpm drop once nice and warmed up. A 25 pilot still at 2.0 turns out feels just right after a couple more rides.

The old timers may scream "Holy $hit it's not supposed to use such a massive main!", but I kept going up in my mains until a WOT roll off to 7/8ths didn't result in an increase in power. Currently I made it up to a, wait for it.... 260 large hex. A couple hours of in-town hooligan riding is showing excellent plugs. Color change halfway down the ground strap, toasty ring at the base of the insulator. Power is very linear and doesn't surge or fall flat at any rpm.

*I may play with going back to a 30 pilot but increasing the air jet, but does the air jet have much effect on the pilot circuit?

Jetting:
Main Jet: Large Hex 260
Emulsion tube/Needle jet: BLEED TYPE 176 series P-8, richest I could find
Slide: 2.5
Pilot jet: 25
Needle: 5F3, lowest (richest) clip setting
Air Jet: 0.5
Air Screw: 2.0 turns out

 

[mystahagy]

Good info Teazer.

I agree the vm30 is a bit large for the application despite open intake, exhaust, and a port cleanup. A 28 would probably perform much better with the increased velocity. Already having the richest needle jet I could find, going richer on the needle is possible to bring the clip setting back in the middle, but is that really worth it? I'm on the richest setting, but it's not like I have shims shoved under the clip either.

A dyno run would be wonderful, but that's just not available within a few hour's drive. In a perfect world however...