Filters and Rollers and Jets, Oh My! Tuning AF05 E

[Wheelman-111]

Greetings:

I'm working through fine-tuning of Flash, trying to extract all I can from the "inferior" SE - OOPS! - I mean AF05 E.

Fixed features of my setup include a Polini 65 bore, Carbon reeds, a rather large K&N filter and the Legendary LeoVinci pipe. ALMOST Too-tall 7.83:1 Gears, too. Using NGK BPR8 for prolonged "high"-speed operation.

I'm also juggling a couple of vAerioables:

1. Keli Variator, now pretty close to a perfect compromise between midrange acceleration and top end speed maximum; a trio each of 8s & 7s. I still feel it's still decreasing the revs by upshifting to full overdrive a bit too soon, cutting top speed due to "lugging" down below power peak RPM. Certainly better than it was with all 8g. - like 5MPH better!
(0-5 still sucks, but that's a Clutch issue...)

2. Stock carb - 14mm PA-04W with a 96.5 currently installed. Plug color certainly not over-rich. There may or may not be more power to be had with an upjet. Adding power might add available RPM at WOT, thus requiring another adjustment to #1 above.


I believe if I lighten up to 7s and 6s, I will raise the RPM in the midrange to some degree. (The engine pulley/belt/driven pulley will tend to run a lower "gear" longer...) This should also delayfull overdrive upshift until my groundspeed has climbed a bit higher. OK in Theory?

But that RPM increase will also (in Theory) increase my operating temperature would it not? Y'see, one change almost certainly affects the other.

My practical question is:

Do I
A. Install only the lighter rollers, leaving the 96~ in place, then wait to see if it starts running hot?

OR do I
B. Change the jet to a 99, try that out by itself - see if I get more output?

OR should I
C. Make both changes and work up/down from the outcome?

I generally believe in the principle of making only one change at a time, then evaluation prior to the next. However this situation may warrant an exception to that rule.

[scooterwerx]

as long the jetting is close, i would tune the trans first. carb issues are usually very noticeable with stumbles and hiccups and such, and a plug read will tell you alot. if its so lean that jetting richer would increase power, you would see a white plug and it would be running hot hot hot. a hill will tell you if the variator is right....

[losthope]

i would get it jetted right before i did anymore variator tuning. if you see a power increase or decrease from jetting it may change the way you tune the variator. though you may have to go back and rejet after variator is tuned if it allows the motor to see higher rpms...

[burnt_toast]

They go hand in hand man, and in sequence you should do them in the exact order you've mentioned. I believe you stand to benefit from the lighter rollers

1. go with lighter rollers, see if you gain performance keep eye on temps

2. install bigger jet see if you see decrease in performance, if not then note new temps, if yes then 96 was good

Personally even 7 and 8's are still too heavy, I run around 33g in my Keli with 6x malossi 5.3g rollers and for me its just perfect between good takeoff, midrange pull and shift, and top speed

p.s. I've gone the route of leaving vari near stock and doing jetting alone, turned out rollers where too heavy corsa never got into powerband and my dozen jetting attempts where just waste of time! so learn from that, vari and trust do indeed go hand in hand

[Wheelman-111]

Greetings:

Appreciate the advice from the Cognisenti. 5s & 6s get loaded in tonight. Results manana.

Thanks!

[Wheelman-111]

Greetings:

Installed a trio each of 5&6g rollers. Motocross-level RPMs with midrange to match, but top speed down 5 @ 43. but I'm liking the improved takeoff and acceleration

I have a Metropolitan wheel on the way, however. The ~15% upgear from the 90/90 tire should fold right into the formula, so I'll leave it as is for now.

Temps have not moved up from 275 and I think the jetting is close enough.

[burnt_toast]

Cool, sounds like 6-6.5g would be sweet spot for you but I hear you on the accel factor it can be quite fun

[Wheelman-111]

Greetings:

AM Temps in Deepinnaharta were 37. Despite that, during my ride to work I noted CHT hovering around 300 while in half-throttle 30-35MPH canter. RPMs alone I think, situation seemed stable and ran quite well. Plug check tonight, and I'll try 6s & 7s after all. Just nothing to push against with 5s & 6s.

[Kenny_McCormic]

Running with a un optimal variator weight wont hurt anything, running lean will.

[Wheelman-111]

Greetings:

The 5s and 6s produced steady-state RPMs well above the HP peak. This caused the engine to hit 350 on the way home. Switching to 6+7 brought it back down 5 "half-notes". Sorry, no tach but try going from an A to an E on your guitar - sorry- ukelele and you get the idea. Engine temps rolled back to 275-300 range. Thanks for nailing the weights for me, Werx and Toast!

I didn't have GPS mounted but speedo went to the "E" on the fuel gauge too! 50+ and quickly. Best of all was the 15-40MPH rate of acceleration. No problem keeping up with traffic tonight!

Flash be officially StreetWorthy.