Flash 5 Rises Like a Phoenix from the Ashes of F3

[LMH]

Pauly runs 98 octane wheels, I wouldnt run that without at least 25% 110 octane with 93, same as the MHR. If your gauge was bad also it would read less not more. What carb is that also? Looks real pretty.

[Downsouthdio]

Thats a black oko

[Wheelman-111]

Greetings:

Sound advice, Dawgs. I believe I'll take it. Trouble with AvGas is it cuts into the Economy of what the scooter is supposed to save. I shudder to consider the per-gallon price.

Meanwhile is there a source for a 0.5 mm 47mm diameter flat plate? I' ll swap my brand-new Kikaku 51mm x 1mm plate for a 47.

Kikaku51R.JPG (302.02 KiB) Viewed 3371 times

The copper one measures 52.83 and 1.2 thick.

For now, Deepinnaharta Airport here I come.

[paulpauly7]

the 98 i run is at all gas stations as well as 91 octane and 96 octane prices aint that different between them

[paulpauly7]

i have 2200 kms on my motor with no problems what so eva

[kingkamehameha]

Yo wheel dude bad idea running it on that low octane. You can probably hear it pinging. The only way to make up for the higher compression is to run real rich. Just go down to honda and buy a stock head gasket and open it up to the malossi size. You will get piston blow by and predetonation. Cmon man its like putting regular gas in a bmw m3. I dont know why you touched the exhaust port it wont help much brother its like that for a reason. The extra oomph your feeling is from the higher case pressure and counter balanced crank as well as wheeldude porting. I might be switching to a cast iron soon

[LMH]

If you ever hear an engine ping its already happened and damage is already done or ongoing, unless you have ultrasonic ears. No matter how rich you run an engine with that high of compression it will end in detonation. You need a bigger bang to make up for pressure. If its dieseling its pre ignition.
Not sure what pre detonation is but heres a link to what detonation vs pre "ignition" is.
http://www.streetrodstuff.com/Articles/ ... etonation/

[LMH]

One more question pauly, are you running 98 RON or 98 octane? Big difference there as well. (R+M)2= US pump octane number. Research octane number times motor octane number divided by 2 = AKI (Anti knock index) or PON (pump octane number). 98 RON is 93-94 US PON, 96 RON is 89-90 PON, 91 RON is 86-88 PON I think. Its what they run in Australia and NZ.

[Wheelman-111]

Greetings:

Thanks everyone for your opinions.
How is it that Diesel-Happy Europe gets higher-octane fuel for regular consumers than the U. S. and A? This is the land of Big-block Fords and 426 Hemis. Theirs is a land of Citroen DSes. Anyway I absolutely will heed the advice and do something about 175PSI compression. The question is: What to do?

For the record, the Malossi Iron (MArn) idled as sweet as the Corsa ever did on Pump Premium (Octane stated simply as 93 in these parts.) once I got that 50 Pilot in there. Also I never added extra gaskets to the Corsa, never even touched the block. You can imagine how attentively I was listening for sounds of suffering - heard none. Temps at idle stayed ~200-ish and even a short ride around the Casa Complex was event-free albeit at tiny throttle opening.

Nevertheless, Wheel-Boy and I enjoyed a 10-mile trip to Deepinnaharta Municipal Airport. Price for AvGas 110 was a mere $6.25, the increment to be figured in along with Motul Synthetic bringing fuel cost to roughly $7 per gallon when mixed half-and-half with 93 octane as I plan to do. Good thing it gets such spectacularly good mileage, right? (Like, 30MPG?)

Never having bought AvGas before, I didn't know quite what to expect. It ain't so bad. Gary the airport guy was friendly. If I gotta make a trip about once a month to keep MArn happy, I guess I can live with it. I really, really don't want to pull this engine off again for a while. If I run a 50-50 mix of 93 and the AvGas, I should be good like it is, Right?

[paulpauly7]

we have 98 octane not ron

[bonesv]

You could do as I did, and slightly remove some piston dome material in the smoothing and polishing process. The dome and exhaust port are mirror polished.
My Malossi cast-iron cylinder compression is at 135 psi with just the o-ring. No holes yet.
Hope this helps you.

[Wheelman-111]

Greetings:

Thanks Bones. Harley-Davidson's 1200cc kit for the 883 features reverse-dome pistons for this exact reasons. I don't suppose you took pics of your carve-outs? Anyway, I'm not so sure I want to mess with the masterful flowing shapes of these fine Italian craftspersons. AvGas it is for now. Maybe a Stack O' Gaskets later, but it seems to be running very well for such a new cylinder. Just a mild stumble off-idle, probably needs a needle clip moved. 50/125 in the OKO 24, in case anyone is interested. It's chilly for a change, mid-50s here in Deepinnaharta. Comments?

Speakin' of the 24, lots of them come with the infamous Power Jet, reportedly tricky to tune because it adds a Fine Mist O' Fuel at larger throttle openings. The BB

F5BBPowerJet.jpg (188.86 KiB) Viewed 3355 times

in that tiny line defeats it and allows to tune this carb "Normally". Someday I may revisit and try to tune with the PJ but there is a tiny jet that seems to come only in one size under that big brass screw.

While on the Intake subject, my OKO airbox performs well, but it's not designed for the US Elite, nor for the CT Chrome. The angles are wrong, forcing the consumer to bend the snot out of the snorkel between the bellmouth and the box. Eventually the bend in that cheap rubber leads to cracking. Plus the box itself fouls the lower skirt when mounted to the Elite. Enter the Heat Gun:

F5AirboxModHeat.JPG (282.68 KiB) Viewed 3355 times

See how the mounting boss is now angled 20 degrees? (Hint: the gun aims roughly at it - a silver spacer edge shows in the pic.) When the plastic starts to glisten, stick a #2 Phillips into the mounting spacer and lean on it until it's where you think it should be. Then run it under cold water and it stays where you put it. (Even if it's wrong...)

Now I just flat LUCKED OUT on my first try:

F5AirboxModAfter.jpg (247.95 KiB) Viewed 3355 times

It's tucked in Just Enough to avoid contact between the top outside of the box and the black side skirt when the shock's compressed. and I angled it forward enough so that the snorkle angle is gone too. Little details make for great Joy.

[LMH]

With 25% 110 75% 93 octane 32:1 ratio I run 45/122 PJ blocked off on my MHR cylinder/MHR crank, Im surprised to see your jetting on the Marn to be higher.

[Wheelman-111]

Greetings:

This MArn (Malossi Iron) has yet to suckle its sustenance from the Main Jet. 125 was an Assuredly Rich guess, and what I ran on the Corsa with a 26mm. I'll probably end up at 120 or so. I couldn't get a steady idle with the 45 doing heat cycles, and skipped over the 48. Probably needs to go down too.

I appreciate your input everyone. BTW AvGas has an intoxicating smell!!

[kingkamehameha]

You need to run two stroke race gas. Why not just use the premium gas and add the metal head gaskets wheeldude. I have heard corsas and cast irons and mhrs with no extra head gasket ping on regular octane 88 i think. Kids here use the ethenol free thinkig they are getting better gas but what they dont know is the eth premium gas helps alot with cooling and pre ignition