ESE's works engine tuner

**Yow Ling** · 11th March 2012, 08:04

Marsheng failed to mention its a 4 stroke

**marsheng** · 11th March 2012, 08:17

Originally Posted by Yow Ling

Marsheng failed to mention its a 4 stroke

I tried this carb a year ago I could not get it to work properly. Interestingly, the guy who I bought this from, also could not get it to work. It is basically a new high performance carb. I've got a bit more knowledge now and giving it another go and have got better results but still not good enough.

http://www.marshland.co.nz/ftp/CB150/CarbInners.JPG

I stripped the unit and I noticed that the air bleed jet is very small, about 0.8 mm which would 'confirm' that the fuel is not getting enough air to correctly emulsify.

**Yow Ling** · 11th March 2012, 08:18

OK Im only posting this here because this is the only thread on kb most people read

Sorry its a diesel, but it is out there so worth a look

http://www.simplicitymotorworks.com/...20Features.pdf

has a disk valve and several departures from normal

maybe this better link

http://www.simplicitymotorworks.com/

**richban** · 11th March 2012, 09:16

Originally Posted by marsheng

I stripped the unit and I noticed that the air bleed jet is very small, about 0.8 mm which would 'confirm' that the fuel is not getting enough air to correctly emulsify.

There was a thread on a pit bike site in AU that talked about fixing really crapy PWK knock offs. With my 30 and 32 I drilled it to 1mm. Manly because the castings were a bit wrong. Is this a power jet version? When I get my FCR working I could lend you my 32 it should be jetted and very close to what you need. Little rich on the bottom but hey just keep it pinned.

**wobbly** · 11th March 2012, 09:35

I checked the emulsion air passage on a pile of different 2T type Keihin carbs when I converted a 4T FCR downdraft to work on a 2T.
They ranged from 1.7 to 1.9 mm - none were jets as such ,just drillings into the emulsion well below the shroud.
The tuning stuff available on FCR suggested that 2mm always worked best on a 4T as the better emulsification gave better power - even though the AFR was a little
too lean up top due to the big air jet.
On the dyno I played with the replaceable main air jet, and settled on a 150.
As with this and the low shroud, its fuel curve was spot on.

I think what you guys are up against is the problem that has always plagued bleed carbs.
Dellorto and Weber have literally hundreds of tiny variations in bleed hole geometry to match a carbs fuelling to a specific engines needs.
Luckily it has been found that the primary type on a 2T is easily nailed, just with changes in needle shape, and an adjustable idle/air and main.

**Kickaha** · 11th March 2012, 09:39

Originally Posted by Yow Ling

maybe this better link

http://www.simplicitymotorworks.com/

150cc, yeah that should be bucket eligible

**Ocean1** · 11th March 2012, 11:47

Originally Posted by Kickaha

150cc, yeah that should be bucket eligible

And with that big fuckoff prop you won't be short on elbow room going into the first corner...

**dinamik2t** · 11th March 2012, 12:38

I accidentally just found out that Jan Thiel is a Facebook addict: https://www.facebook.com/Jamathi

There are some very interesting mechanical and historical photo there! Perhaps Frits could ask him, whether I could repost some of his photos here, as many wouldn't have a facebook profile.

**Frits Overmars** · 11th March 2012, 15:20

Originally Posted by dinamik2t

I accidentally just found out that Jan Thiel is a Facebook addict: https://www.facebook.com/Jamathi. There are some very interesting mechanical and historical photo there! Perhaps Frits could ask him, whether I could repost some of his photos here, as many wouldn't have a facebook profile.

I didn't have a Facebook profile either, I just registered because of what you wrote. Now I will have to learn to find my way around it.
I must say I'm a bit sceptical. I just don't believe in 'over a thousand friends'

By the way, if you want Jan's permission for anything, you will have to ask for it yourself, dynamik. Since both of you are on Facebook, that shouldn't be a problem.

**dinamik2t** · 11th March 2012, 16:17

Originally Posted by Frits Overmars

I didn't have a Facebook profile either, I just registered because of what you wrote. Now I will have to learn to find my way around it.
I must say I'm a bit sceptical. I just don't believe in 'over a thousand friends'

By the way, if you want Jan's permission for anything, you will have to ask for it yourself, dynamik. Since both of you are on Facebook, that shouldn't be a problem.

Yes, at first I was like "what's that, a facebook profile and personal photos? is that Jan Thiel?" - it seemed a bit strange., with all the respect!

I can't and shouldn't be judgemental on anybody about personal stuff, so excuse me.

As for the permission.. I didn't mean to have you 'do my dirty work'. I feel strange about asking things in personal, either facebook messages or PMs in forum. Plus, to be honest, I have a facebook profile for 'tuning demonstration/promotion' purposes only and I cannot help feeling embassared for my work against Jan Thiel's. Yes, that might be an inferiority complex, but.. ok.
Since you think it will be ok, I will send him a message.

p.s. I know there's no real word 'dinamik', but it's what my moto is called. so, if you don't forget, use the i

**dinamik2t** · 11th March 2012, 17:15

So, Jan Thiel gave his ok. A few pics I found interesting:

https://fbcdn-sphotos-a.akamaihd.net..._5635058_n.jpg

"Jamathi cilinder 1967"
https://fbcdn-sphotos-a.akamaihd.net...31566681_n.jpg

Derbi ignition trigger
https://fbcdn-sphotos-a.akamaihd.net...53860359_n.jpg

Cylinder inspecting - with Giovanni Sartorato e Matteo Marini
https://fbcdn-sphotos-a.akamaihd.net...23738121_n.jpg

"Brno 1969, our best win! On the right is my Czech friend Olda Fiser."
https://fbcdn-sphotos-a.akamaihd.net...29438763_n.jpg

"With my friend GJ Rigter at the Aprilia flowbench. The tool in my hand is for flowing the transfers. We flowed them with the piston in 4 different positions."
https://fbcdn-sphotos-a.akamaihd.net...79032436_n.jpg

"The front half of an Aprilia crankcase. The crankshaft could be fixed in various positions by a springloaded ball. We used this for flowbench testing. We could see that the conrod disturbed the flow very much, so the idea of the rear inlet RSA was born!
https://fbcdn-sphotos-a.akamaihd.net...27010343_n.jpg

**TZ350** · 11th March 2012, 17:56

OK .... that was Te Puke, its a great tight track, lots of elevation changes and hair pin corners. The weather was fine Saturday wet Sunday, and rained all day long but great racing and times in the wet were much the same as the dry.

And Tokoroa was no fluke as Av managed

Placings were:-

Race 1 Av

Gav-V

Rick

and Kel

Race 2 Av

Gav-V

Rick

and Kel

Race 3 Av

Gav-V

Kel

and Rick

So three 2-Strokes and Gav-V's FXR at the pointy end all day.

**marsheng** · 11th March 2012, 20:32

Originally Posted by wobbly

I checked the emulsion air passage on a pile of different 2T type Keihin carbs when I converted a 4T FCR downdraft to work on a 2T.
They ranged from 1.7 to 1.9 mm - none were jets as such ,just drillings into the emulsion well below the shroud.

Thanks for the info. The original Honda carb has a similar emulsion tube and it's air jet was around 1.8 mm, so it looks like it is time to do some drilling.

**kel** · 11th March 2012, 20:37

Originally Posted by TZ350

And Tokoroa was no fluke as Av managed

Placings were:-

Race 3 Av

Gav-V

Kel

and Rick

Once again Avalon looked unstoppable.
I pulled a horsepower mugging on Rick in that last race. The beast was embarrassingly fast, clearly quicker up the straight than anything else on the track.

**Buckets4Me** · 12th March 2012, 05:37

Originally Posted by kel

Once again Avalon looked unstoppable.
I pulled a horsepower mugging on Rick in that last race. The beast was embarrassingly fast, clearly quicker up the straight than anything else on the track.

and more likely to bite than the marshalls