Flash IV

[Wheelman-111]

Greetings:

Down to 48/122 Pilot & Main, with 29g in the Vario = 8400 Max RPM at WOT. Power feels soft on top still, plug still dark and temps comfortably below 300 at all times.

Q: is it possible that it's still running "on the Pilot" at WOT if the Pilot is too big?

I don't have a Main smaller than the 122, and was thinking of taking the Pilot down to a 45 to see if I could wake up some power. Don't want any off-throttle heat spikes, though.

My only other option is to drop the needle to full-lean position 5. That or start over with the PG Long, in this 86cc block. Then again, I could swap Flash 3.2 back in and tune the CORSA, but I really want to optimize this engine first. Decisions, decisions...

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[bakaracer]

Greetings:

Down to 48/122 Pilot & Main, with 29g in the Vario = 8400 Max RPM at WOT. Power feels soft on top still, plug still dark and temps comfortably below 300 at all times.

Q: is it possible that it's still running "on the Pilot" at WOT if the Pilot is too big?

I don't have a Main smaller than the 122, and was thinking of taking the Pilot down to a 45 to see if I could wake up some power. Don't want any off-throttle heat spikes, though.

My only other option is to drop the needle to full-lean position 5. That or start over with the PG Long, in this 86cc block. Then again, I could swap Flash 3.2 back in and tune the CORSA, but I really want to optimize this engine first. Decisions, decisions...

what do you have the airfuel screw at?

[Wheelman-111]

Greetings:

Classic Bakaracer enigmatic question, to make me think of other factors!

The Idle Mixture was set at 1.75-2 turns out. Any richer dropped the idle speed. I tried it at 1.5 and at 2.25 also.

It doesn't seem to make much difference, but I have a feeling we're about to learn otherwise from Baka-san!

[bakaracer]

what airfilter are you using? oiled or non oiled? whats the air temp ,humidity and berometric pressure?

[Wheelman-111]

Greetings:

Filter is UNI, pretty thick with K&N filter oil, recently refreshed.
Temperatures range from low 80s to low 90s. Humidity is Deepinnaharta-typical 1000%. Barometric pressure is 29.47. Scattered showers and thunderstorms, chance of rain 30%.

Dude, you have any suggestions or did you just post for a Weather Report?

Rode to work this morning. I'm surmising that a weak spring + Very Light rollers is tough to tune for top end. Revs up to 8500 with about 27 grams faciing a stock Kymco spring. Variator doesn't seem to shift much past 2/3, I surmise it's because Centrifugal Force = Mass x RPM Squared, while spring force is linear. Ordered a +1000 and a +1500 spring from VT, and seriously considering giving up trying to extract more than the ~50 MPH I'm getting from this Hot Surfaces pipe. Break-in considered Done at 4.5 hours run-time.

[bakaracer]

if it feels just a little rich still at 3/4 to wot ,try taking the airfilter off and also check the carb mouth to see if some oily dirt has collected at he mouth of the carb and the inlet for the airfuel screw. also try it without the airfilter too. if it runs better then clean the oil off the filter. sometimes to much oil on the filter or the airflter its self will put you in between jets and cause a over rich condition. when I go to the races, i carry 3 different sizes of airfilters for that reason.the jets stay the same I just change the airfilter and adjust the airfuel screw.

[Wheelman-111]

Greetings:

What an excellent tip. Wish I'd thought of it first, but grateful.
Thanks, dawg!

What does the oily dirt at the Pilot do that's bad? You'd think it'd lean the pilot...

[Wheelman-111]

Greetings:

Running sans UNI didn't make a huge change, but instead of dropping RPM and power as it did with a filter, the power stayed flat. Temps stayed about the same This confirmed that the 45/122 was still a bit much. (and the very low drag of an UNI Pod!)

Having no 120, but only a 45 Pilot, I installed the latter and put the filter back on. The result was a quick lope to 50 MPH, where the Hot Surfaces pipe seems to call it a day. I think I can get a bit more with tranny tuning but maybe not much. The Vario won't let it reach 9K at the moment, waiting on a Contra spring or 2 from VT. The stock Kymco spring is facing only 29g of weight, and it still won't max out. Perhaps I should try the longer 669 belt with more weight?

Then again, with 5 hours' run time and stable temps, maybe it's time to reinstall the PG Long, with a re-jet of course.

[Wheelman-111]

Greetings:

Feeling too lazy to pop off the tub to change pipes and start all over with jetting tonight.

Instead I pulled the tranny and installed my new Blue +1K Contra spring, along with a 669 Bando. I had to guess at the roller weights, and opted for 38g. I guessed right.

The long belt made an incredible difference in take-off thrust. If I knew how to wheelie, I could do one! Shifted promptly to 6500-7K for relaxed engine speed at 45, but downshifts instantly when throttle applied and pegged the needle at 8750. 55 and climbing! The Hot Surfaces pipe don' need no steenkin' revs to perform. Just needs taller Vario "gears" and perhaps that 120 Main.

Daily Rider Setup:

Cases: 1998 SA50P S model.
Crank: Ruima 44.1
Bore: Char-Mo 50mm
Fan: Daytona
Plug: NGK BR9 HIX
Pump plugged 32:1 Motul 800 Off-Road Premix
Pipe: Taz's Hot Surfaces Torquer
Intake: CT Chrome
Carb: OKO 24 45/122
Filter: UNI 2" 15` Angled
Vario: Polini for Ruckus 38.1g
Clutch: Kymco ZX
Belt: Bando 669x18
Tire: Michelin S1 3.50x10

That's all for now!

[Wheelman-111]

Greetings:

Wrapping up 4.2, same setup as above, but dropped the 122 Main down to 120. I had the needle one click lean from middle to compensate for the earlier choices of 128 and 125. Now I put the slide needle back to middle position, thinking the 120 won't kill the midrange so bad as the 125 and 128 did.

It was another good guess; It's Clearly better, now can keep WOT for spell without losing any RPM/output, even if the throttle is twisted before the Variator maxes out. Acceleration from 40 is good, not great, and temps staying around 250 this evening, = 300 indicated in the cooler morning rides. The temp gauge records an error when ambient temps fluctuate, no temp. compensation. Either way, it's cool enough for a Ministroker.

The plug finally looks like something other than a suit you wear to a Funeral, but it's still a tad rich to run in the mid-high 80-degree temperatures. Still I'm probably going to leave it there for now. It's not fouling the plug, and the slightly Rich condition will provide a bit of "insurance" against a Lean condition if ever the temps in Deepinnaharta cool down for the Fall. (A feller can dream, cain't he?) I really don't care to jet up and down twice a week, which is how often we'll be getting cool fronts starting soon.

Q1: How much bigger d'ya figure I'll need for the PG Long?
Q2: Where do I start with Flash 3.2, a 72cc (stock-crank) Corsa with that same PG Long?

[Bear45-70]

..........................................I really don't care to jet up and down twice a week, which is how often we'll be getting cool fronts starting soon........................................

Dial-a-jet!

[nacree]

I think Dial-A-Jet is exactly what you need. They make a really cool version that has an adjuster that mounts on the handle bars so you can tweak the mixture while you are riding so you dont have to crawl around on the ground and tweak the DAJ with a screw driver.

That said I got a set of three dial-a-jets really cheap on Ebay. They have been used previously but you are welcome to one (I don't need three). I will likely be moving to fuel injection shortly. I have not been tuning nearly as much as you have and I am already sick of making jet changes and getting fuel all over etc. The proposition of an ECU with a Bluetooth connection and an EFI system with ambient pressure and temperature sensors is becoming more appealing by the day.

I only wish there was a way to program the Fuel/Oil mixture so that can be more consistant.

Let me know if you want that DAJ and I'll stick it in the mail.