ESE's works engine tuner

[husaberg]

Husa, you are good at finding shit like this, what has a 45mm fourstroke piston..... semi modern style. CL125? Two valve.

1mm oversize cb125t or cd125

https://www.tkrj.co.jp/goods/m-AH0670X-399-010.php

PISTON KIT
MODEL
CB-125T
CD-125T
OEM No. 399-010
CODE No. AH0670X
BORE(mm) ：Ａ 44
LENGTH(mm) ：Ｂ 48.4
PIN DIA (mm) ：C 13
COMPRESSION HIGHT① (mm)：D 24.9
COMPRESSION HIGHT② (mm)：E 21
PIN LENGTH (mm) ：Ｆ 34.5
PLATING
STROKE 4
PISTON　CODE No. PH0720

[Kickaha]

They certainly do thats $6,366.43NZD

You could buy a brand new TT Industires box for that and it wouldn't be old worn out shit

[Grumph]

You could buy a brand new TT Industires box for that and it wouldn't be old worn out shit

True. But i've handled both and surprisingly the Villiers origin 6 speed is a nicer thing. Needle rollers right through it, not a bronze bush in sight.
The TT Ind boxes are better made, updated 1950's Norton copies. Nothing wrong with that behind a Manx or 7R.
Most of the Villiers boxes have sat on shelves for 50 plus years. Not a lot of the 100 or so actually made it onto track.

[husaberg]

True. But i've handled both and surprisingly the Villiers origin 6 speed is a nicer thing. Needle rollers right through it, not a bronze bush in sight.
The TT Ind boxes are better made, updated 1950's Norton copies. Nothing wrong with that behind a Manx or 7R.
Most of the Villiers boxes have sat on shelves for 50 plus years. Not a lot of the 100 or so actually made it onto track.

For a Greeves i was going to use a bolt on BSA box off a Plunger A10 (a common nearly bolt on mod)and to convert that to 5 speed it would 4G NZD for the NOVA and be one one gear down.
I think there was a 6 speed made for the std BSA box. Tonkin? but these seem to be unobtanium now.
Not sure on the price of a complete TT gearbox but they dont bolt up on the engine as a semi unit llke a STD one will and i would say they are 5-6g as well.

[Kickaha]

t.
The TT Ind boxes are better made, updated 1950's Norton copies. Nothing wrong with that behind a Manx or 7R.

They do about 6 different types of housing with 4 to 6 speeds, also some have kickstart and speedo drive options

Not sure on the price of a complete TT gearbox but they dont bolt up on the engine as a semi unit llke a STD one will and i would say they are 5-6g as well.

Around 6g for a BSA 5 speed with kickstart and speedo drive which is what I bought for mine

[husaberg]

this is interesting

https://thunderproducts.com/dial-a-j...tech-magazine/
https://thunderproducts.com/product/remote-float-bowl/

https://thunderproducts.com/product-...s-accessories/

Also some mods for downdraft
https://motochassis.com/FileDump/AmalMk2.pdf

[lohring]

A long time ago we ran fuel tests on our industrial style race engines. We tested various "pump gasolines" to check alcohol content. The first fuel was 87 octane gasoline with no additives. This will pass the standard Digitron test for additives used in APBA and other professional racing. We purchased some Coleman camp fuel at Walmart that also contained no alcohol. Some Union 76 92 octane premium gasoline contained 8% alcohol. Fuel advertised as E10, supposedly containing 10% alcohol, actually was 32% alcohol. E85, purchased at the same station and advertised as containing “at least 70% ethanol”, was only 60% alcohol by our test. We ran a single pipe that was not adjusted for different EGT from the various fuels. In our fixed ignition, low compression engines the fuel made no power difference.

Lohring Miller

[Strokerhaus]

If it's the one I found, you get a complete bike for the money. 3500 quid with decent spares too.

The one I saw was the one Husa found, but if the other is better great.

I was up seeing a friend who runs Villiers 210 Karts which put out serious power, he has managed to get the old road gong Villiers box to last a season, Maybe worth talking to, he said the Starmaker 4 speed box was way better than the standard road box. His name is Simon Bateman from Nametab Engineering here in the UK.

Best of luck

[Grumph]

The one I saw was the one Husa found, but if the other is better great.

I was up seeing a friend who runs Villiers 210 Karts which put out serious power, he has managed to get the old road gong Villiers box to last a season, Maybe worth talking to, he said the Starmaker 4 speed box was way better than the standard road box. His name is Simon Bateman from Nametab Engineering here in the UK.

Best of luck

Yes, I've heard of the company. Never dealt with them. I've been there with Villiers road boxes. An earlier 197 special split a 3 speed case - as you do. It finished up with a 4 speed box from a Greeves which took a bit of fettling to make fit. Lasted OK. I'll stick with the CR 4 speed for the moment. In it's class it's not a great handicap.
If a six speed falls into my hands, great. If not, I'm only doing it for fun.

[ken seeber]

2B or not to be??

The beauty of taking so long is that you don't have to rush for the next stage...

[SwePatrick]

Need to backup my info on tuning twostroke with o2 sensor.

Do you guys compensate for air in exhaust at full throttle in your twostrokes?

I have just installed the o2 sensors in my dyno and made a testpull.
It was rock solid 11.86 AFR up to peak torque, and leaned out to about 12 at peak power.(e85 fuel)
Really happy with that stability and fuel curve, but as i know there are some unburnt oxygen in exhausts i figure i actually run it a little bit rich(safe), and my plugs verify that.

So my qustion is, do you have some rule of thumb?
Like this: 12.0 in afr is actually 11.5
My sensors are located in the endcone about 8cm upstream from stringer.

Rgds.

[wobbly]

The Lambda is telling you what is actually happening , if its leaning slightly up top but is perfect everywhere else than a slightly smaller main air compensation with a slightly bigger main will flatten out the curve up top
but keep the rest the same.
This effect up top could also be an artifact of excess timing retard past peak torque - the fix for having to go rich on the main to keep the egt or Lambda correct is to flat line the ignition at that point.
I dont know what the best dyno power egt or Lambda is on E85 but you should , before making decisions on jet changes.
As maybe this scenario is perfect ie slightly rich in the mid , cooling the pipe , then slightly leaner up top , heating the pipe and making it rev.

[SwePatrick]

Yes, and i´m very suprised that it was rocksolid with very little fluctuation, almost none, just that smooth leaning up against revlimiter from peakpower.
But i figure it will be more if i measure at cruising speed, and not full throttle.

E85 fuel is happy at around 0,78-0,82 Lambda, and even as it is alcohol it isn´t fancy of more ignition, altough it can take it.
I only use it as an extra safety from detonating and it runs about 100-150c cooler in exhaust, less heatproblems.
And actually some powergain, about 6-8% if tuned correctly.

But my question was that maybe someone has seen a pattern in how much they report wrong value due to unburnt air in exhauststream.

I´m using this 'adapter', this one should make lifespan a little bit longer, i will not leave sensors in exhausts outside dyno.
So i figure they can take a couple of runs, fun fact : it is the same sensors as in my two mercedeses, so i´ve got in total 6 sensors(4 spare) as i´ve replaced them on my cars.

[wobbly]

The Lambda channel may have alot of data smoothing on it in the software.
This makes a huge difference to the Hp curve info , where you can have a dead smooth printout with hardly a bump anywhere , or a scattered trace with ups and downs over very short rpm intervals.
Lambda only reads the excess O2 in the combustion gas residuals , and this is then converted into a A/F ratio for ease of understanding , I dont think any fudge factor for the different fuel is needed.

[husaberg]

2B or not to be??

The beauty of taking so long is that you don't have to rush for the next stage...

Hamlet had a stab at it but from memory got Polonius instead of Claudius.