ESE's works engine tuner

[richban]

The only carbs that dont do this have the bowls sitting horizontal, and the bore downdraft, like FCRs,or the other is the Lectron that has
no pilot circuit at the front of the bowl.

With the FCR's you've run on the 2 strokes wobbly. Have you run into the problem I have, where the needle rounds out the top of the emulsion tube / Needle jet and kills all half throttle fuel control?

[F5 Dave]

S`common problem and why I run an `orribile mikuni RGV carb on the 100. Pity there isn't a real downdraft pwk.

[Frits Overmars]

Pity there isn't a real downdraft pwk.

Build your own; start with foul-stroke stuff and replace what doesn't suit you. We did it in 1992, so why not now? Maybe because now injection would be a better bet...

[F5 Dave]

Yeah they tend to be a little as the a`mercans say; spendy. And the last thing I need is another project but thanks for the thought.

[wobbly]

The needle clips in the FCR are locked into the slide but the needle is free to slop about - a real design fault as yes the big 4Ts that run them always end up with worn tubes.
The carb on the Rumi is an FCR,thats the first time I had seen the idea used,the "Great Leader " should have taken note somewhat later and used the idea instead of
putting a 45* bend in his upsidedown creations intake - instantly loosing a couple of Hp.
Re downdraft PWK, the carbs on NS400s etc are exactly that,some had D slides but they would work really well in a 100.

[jasonu]

Re downdraft PWK, the carbs on NS400s etc are exactly that,some had D slides but they would work really well in a 100.

Good luck finding any of those that don't cost more than the bucket you want them for...unless you and 2 mates can split them.

http://www.ebay.com/itm/Honda-NS400R...837480&vxp=mtr

[husaberg]

Good luck finding any of those that don't cost more than the bucket you want them for...unless you and 2 mates can split them.

http://www.ebay.com/itm/Honda-NS400R...837480&vxp=mtr

The NS400 carbs are pretty much the same as the NSR250 carbs.......
Which come in sizes between about 28mm and 34mm.


Also there is always the TDMR Mikuni but as Dave said a bit spendy........


Oh it looks like there is a down draft PWK (Well it looks like one with the slide body)
The YD-MJN28
Yoshimura Downdraft - Multiple Jet Nozzle
Hate to think what it costs
http://www.yoshimura-jp.com/en/produ...ine/yd-mjn.php
buggger only 24mm and 28mm

http://shop.yoshimura-jp.com/syouhin...i.php?id=16682

[TZ350]

Hate to think what it costs
http://www.yoshimura-jp.com/en/produ...ine/yd-mjn.php
buggger only 24mm and 28mm

http://shop.yoshimura-jp.com/syouhin...i.php?id=16682

30,000 yen = $342 NZD

[husaberg]

30,000 yen = $342 NZD

you sure? because the Small TDMR's are between 500 and 900 US
it seems a bit odd doesn't it....... Hard case but sized more for a 50 (or restricted 125)
he googles and comes up with the same answer as Rob though..........bugger its not a little bit bigger...

[dark art]

Wouldn´t the Mikuni TM SS series work? Several bikes had those carbs from stock, the yamaha DT125R model comes to mind, in 28mm I believe.

[F5 Dave]

Having some NSR carbs here (thanks yowling) and an old mvx carb they are the same body and 25mm mvx. 28 NSR. But I believed that 28 was as big as they got.

I've got a 32 RGV carb and a matching one I've bored to 35 that has worked better but had issues also home mod for PJ solenoid but needs more time and I've had other issues to sort.

[husaberg]

Having some NSR carbs here (thanks yowling) and an old mvx carb they are the same body and 25mm mvx. 28 NSR. But I believed that 28 was as big as they got.

I've got a 32 RGV carb and a matching one I've bored to 35 that has worked better but had issues also home mod for PJ solenoid but needs more time and I've had other issues to sort.

I have a pair of NSR carbs here that's a bit bigger than that.
They have the air correction solenoid and TPS not sure which model though, but it came from Rob......
He goes upstairs to measure........
Typical keihin 36mm at bore but more like 30x 32 closer in at the venturi (think of a XR200 carb if you don't know what I mean)

It's a TA22a I have here so I'm guessing Daves one he has is a TA10 or suchlike off a MC16 or earlier.....maybe even mc14 or whatever the ns250 was called
According to the NSR World site the nsr MC28 had TB model carbs so I guess mine are MC21 or 18 (later they are early MC21)

He fumbles about the NSR world site ...oh here are the std settings
http://tech.nsr-world.com/nsr250/all...b-settings.php
they list them as 32mm but that's a venturi measurement.
according to the blurb they have a pj..........

Wouldn´t the Mikuni TM SS series work? Several bikes had those carbs from stock, the yamaha DT125R model comes to mind, in 28mm I believe.

yeah we got them here on the tzr250.. decent carb but a bit small, they only bore out to 29mm

[peewee]

Re downdraft PWK, the carbs on NS400s etc are exactly that,some had D slides but they would work really well in a 100.

if i need a downdraft style for this yami engine then whats my choices in 36mm-39mm range ? will be mainly for drag racing. mostly up sand hills

tomorow im gonna take a look at the pwk on my ktm 300 and see what kind of angle its sitting at. maybe they can be used with alittle more forward tilt without much trouble. it only has to work well going up the hill

if nothing else i guess i could use some lectrons. dont they work fine at a fairly steep forward angle ?

[F5 Dave]

if i need a downdraft style for this yami engine then whats my choices in 36mm-39mm range ? will be mainly for drag racing. mostly up sand hills

tomorow im gonna take a look at the pwk on my ktm 300 and see what kind of angle its sitting at. maybe they can be used with alittle more forward tilt without much trouble. it only has to work well going up the hill

Ahh ya bugger, I was just about to crack that joke.

[Tim Ey]

It did; it circulates 60 liters per minute for an engine that produces about 60 hp at the crankshaft: there's your rule of thumb.

A friend of mine measured a Suzuki GSXR 600 K4 Pump, mounted on the bike.

Like this one http://www.ebay.de/itm/Suzuki-GSX-R-...item5adef8a7c0
I do not now the crank to pump ratio but I think this might help a few of you guys as the pump is good seperated from the engine.

Cheers!