ESE's works engine tuner

[bucketracer]

...... VJ22s should be 34s with solenoid doofers........

TeeZee has me working on a carb setup that has a lot of pipes and probably had a solenoid doofer originally.

We would like to know more about the air solenoids function.

And if anyone has got a carb air solenoid? please PM me or TZ350, we want to try one on our carb and see what the dyno tells us.

[husaberg]

TeeZee has me working on a carb setup that has a lot of pipes and probably had a solenoid doofer originally.

We would like to know more about the air solenoids function.

And if anyone has got a carb air solenoid? please PM me or TZ350, we want to try one on our carb and see what the dyno tells us.

His other bits seem reasonably price $50 FOR A FRAME AN'T BAD.

As for the RGV carbs. I thought the imports were all 32mm regardless.Well according to this some were 30?http://www.rgv250.co.uk/japmodels.htm
http://homepage.mac.com/rg500delta/d..._airbleed.html

But i know piss all about RGV or suzukis.Well about anything really.
I was going to use one on my bucket for the air plumbing.
Its what Wobbly suggested to me.
Anyone ever tried boring the 32mm ones as the 34mm are getting a bit rare, not that they were ever that common.

I was looking for something and came across this I also knew there was an Amal (Don't get too excited dave iits a M not a N) ) RN a GP2 and a TT carb I never wondered what the RN stood for.
Its remote needle.
No idea how they work other than thay were ment to be a little aburpt with the fuel metering down low .

Before anyone starts on the these are old british crap etc.
I have seen flow figures for the old racing carbs these were beatifully made and were superior to all the jap ones up until at least the flat slides and probably still are now.
The thing is I wonder how much actual distuption the needle actually causes.
It can't be that much can it?
Are they any other motorbike needle less carbs other than the pumper ones?

Maybe Wobbly can help I believe the KR3 had some different carbs?

[wobbly]

The air solenoids on the RGV/RS250 type Keihin carbs are there for emmission and air fuel correction at part throttle settings.
One feeds air into the primary circuit to lean off the mixture at just off idle conditions and the second one feeds air into the emulsion tube to lean off the mixture at higher rpm/part throttle.
The switching points are set by the ECU depending upon rpm and TPS position.
The F3 race kits blocked these off, and used a different jet setup for high perf usage.

The KR3 had special carbs on a few bikes, as they had nightmares trying to get the Keihins off RS125 Honda to work running around the wrong way.They used a pump around system to keep the fuel level at a constant height.
I finally figured out what was happening when building the BSL.
The floats were being pulled down under hard braking - flooding the bowls.So I had CNC bowls made up with floats from TMX carbs running on rods, instead of pivoting.

[explode64]

Just a note on the RGV carbs, the VJ21 used 32mm round carbs, the VJ22 Jap spec used 32x28 oval carbs (often called 30mm) and the OZ and UK spec VJ22 had the 34mm. The 32mm cant be that bad for a 125 cylinder. 125cc KZ2 kart engines make 45hp with 30mm Carbs, but if any one has a pair of 34mm RGV carbs I could be interested

[bucketracer]

Thanks Guys for the pictures and info, very helpful .........

[ac3_snow]

Good day at Mt Welly today, weather was beautiful! Had the new rs125 pipe on and a new head which reduced the squish area down to 1mm. When I was fitting the head this morning I noticed the markings on the top of the piston, my thoughts where the carbon build up after one days racing would suggest rich mixture. However I think I was making things up and had no idea what I was thinking about as you can see the results after today in the next picture. Whoops!
Attachment 245139Attachment 245140

[husaberg]

The air solenoids on the RGV/RS250 type Keihin carbs are there for emmission and air fuel correction at part throttle settings.
One feeds air into the primary circuit to lean off the mixture at just off idle conditions and the second one feeds air into the emulsion tube to lean off the mixture at higher rpm/part throttle.
The switching points are set by the ECU depending upon rpm and TPS position.
The F3 race kits blocked these off, and used a different jet setup for high perf usage.

The KR3 had special carbs on a few bikes, as they had nightmares trying to get the Keihins off RS125 Honda to work running around the wrong way.They used a pump around system to keep the fuel level at a constant height.
I finally figured out what was happening when building the BSL.
The floats were being pulled down under hard braking - flooding the bowls.So I had CNC bowls made up with floats from TMX carbs running on rods, instead of pivoting.

Neat trick I have often thought of doing something similar with a ballcock float vave for a farm through.The bloody cattle bend and break the arm.
Was he running some sort of home made lectrons on the first mondas?
The bit above confuses me a bit with the Keihins I guess its a typo.
The Chart to the left above plus the links seems to suggest that one of the air bleeds works up top as well, is it crap?I am guessing it was an emissions thing.I was hoping to be able to modify one for a lean over rev solinoid can they still be made to work for that?
What did you think of the remote needle Pretty trick or what. not bad for the 60 years ago.
would be interested to see how much airflow the needle costs.

With the RGV carbs the RGV website seems to sugest all (WET ClUTCH RGV250 VJ22 HAD 32mm or 30mm carbs) surely the official website would get this right.check the link http://www.rgv250.co.uk/japmodels.htm

Shit Snow Its your shout tonight Thats a hole in one.(golf rules may apply) Sorry to hear. .Re carbs there is some 28mm mikuni flatslide downdrafts for A kr250 $55 for a pair on tradme now similar to tzr250 ones by the look of them.

One a other note I was wracking my brain when someone suggested a down rotary valve engine to think of the engine that was reed and rotary Valve.
Answer is the Kawasiki KR250a/b. If I remember right Aaron Slight won the proddy 250 title on one in about 85. Probably his first national title.Here it is, its a little oddball.
Note the timming spec in the bottom right of the first attachment.Also the gaskets in the 5th attachment at the base of the cylinder I see a wee problem there and i think it still ran acording to the blog

[Pumba]

Good day at Mt Welly today, weather was beautiful! Had the new rs125 pipe on and a new head which reduced the squish area down to 1mm. When I was fitting the head this morning I noticed the markings on the top of the piston, my thoughts where the carbon build up after one days racing would suggest rich mixture. However I think I was making things up and had no idea what I was thinking about as you can see the results after today in the next picture. Whoops!
Attachment 245139Attachment 245140

That will buff out

[bucketracer]

....... as you can see the results after today in the next picture. Whoops!
Attachment 245139Attachment 245140

Bummer, now you will have to clean out the big end (or better yet, strip the motor and replace it). As the alloy sprays straight down into the rods oiling slots and jams the rollers making them skid. If its not already to late, the bigend will need to be carefully cleaned out or your next problem will be a blown bigend.

[F5 Dave]

. . . .
The bit above confuses me a bit with the Keihins I guess its a typo.
. . .

Sounds like you did get it? He's saying that the RS Keihins face forward, when you brake the floats on a lever are forced to rotate about their pivot. Closed, at least for a little while. Except if you mount them facing the other way forcing them open. Ha! Beginners mistake. I'm sure I would have thought of that. (. . . Well after someone explained that it was happening).

Yeah some old Miks had pole dancer slide floats. Maybe they weren't such a silly idea.

There seem to be a few dif RGV carbs about. I have some 32s but seem to be fitted out with air bleed tubes. Perhaps there was a jap VJ21 version as well as a Jap VJ22 & with diff years 4 or 5 or 6 versions. I've thought about fitting a tiny pilot jet in the emu tube bleed to alter the fueling curve if it needs it.

[husaberg]

Sounds like you did get it? He's saying that the RS Keihins face forward, when you brake the floats on a lever are forced to rotate about their pivot. Closed, at least for a little while. Except if you mount them facing the other way forcing them open. Ha! Beginners mistake. I'm sure I would have thought of that. (. . . Well after someone explained that it was happening).

Yeah some old Miks had pole dancer slide floats. Maybe they weren't such a silly idea.

There seem to be a few dif RGV carbs about. I have some 32s but seem to be fitted out with air bleed tubes. Perhaps there was a jap VJ21 version as well as a Jap VJ22 & with diff years 4 or 5 or 6 versions. I've thought about fitting a tiny pilot jet in the emu tube bleed to alter the fueling curve if it needs it.

Sorry Dave the bit I didn't get was at the top of the post the Keihins on the Rgvs bit I was wondering If the VJ23s had them or it was a typo.Never seen a vj23 in the flesh or indeed seen much about them at all, other than a deresticting article in PB I tried looking for a port map and came up blank on the net.I had seen the old pole floats somewhere to but never in a million years would have figured that out.

[wobbly]

Ask Sinclair in Ch Ch if you really want the carb info details.
In all blurb on the KR3 it always says they had Keihin carbs - but as the pic shows they sure arent on that bike - though Mike did say to me they all used Keihin jets and parts.
The solenoid main air corrector could be used to lean off the mixture over the top of the pipe, but this is nowhere as effective as turning off the fuel to the powerjet - I dont think those Keihins had solenoids on the powerjets though.
An overev air corrector would have to have some air being fed in all the time - to do "normal" correction, but then open up to let a heap more air in over the top to lean off the fuel curve.

That hole in piston pic - have you diagnosed what the issue is,always means too much advance for the com used,or too hot plug, or both - if run with crap fuel.
1mm squish means the squish is doing nothing - wouldnt help either, if the com was increased at the same time.

[husaberg]

Ask Sinclair in Ch Ch if you really want the carb info details.
In all blurb on the KR3 it always says they had Keihin carbs - but as the pic shows they sure arent on that bike - though Mike did say to me they all used Keihin jets and parts.

Bugger didn't think to look at the pic Lazy I guess. But I asked about the carbs as I can remember seeing some press blurb mentioning it had "Roberts Carbs". I was just curious what they would be. It intrigued me because in the article it said something of a mix of Keihin/Mikuni and the author said kind of like a lectron and kenny agreed So that threw we even more and I understood Mike was a bit of a lectron guru amonst other things of course.
The other KR Engine the rotary reed Kawaski KR250 is not what I expected every see anything similar anyone?
has Mike moved back here or just on holiday?


I have attached a bit of the puff piece I was wondering about Its not very clear sorry. I guess Kenny could have been just hyping it up a bit for the press

The clutch in the pic of the Roberts 3 you posted.
Is it a diaphragm clutch? Were they common on GP500s? Sorry about the thousand questions Wayne.

[TZ350]

Bummer, now you will have to clean out the big end (or better yet, strip the motor and replace it). As the alloy sprays straight down into the rods oiling slots and jams the rollers making them skid. If its not already to late, the bigend will need to be carefully cleaned out or your next problem will be a blown bigend.

Speedpro tells me he has had succes with engine clean and the garden hose, by wiggling the crank you can feel the dirt, engine clean followed by a bit of an aggressive flush out and then I guess CRC to get rid of the water.

But however you do it, the bigend and mains need to be cleaned out.

[wobbly]

The carbs in the pic were made by Roberts team, but I didnt know about the Lectron setup - no main jet,but all fueling done on the needle??
The clutch in the pic is a AP carbon /carbon diaphram setup, costs 4500GBP ie over 12,000NZD at the time.They ended up being dumped as we could never get consistent launches with the carbon plates.
The inertia was very low as the basket was titanuim/magnesium and in a back to back test with two BSLs at Sepang, the AP bike would pull a bike length every gearchange off the corner coming onto the pit straight.
Mike retired after Biaggi left Yamaha at the begining of the M1 project,and has been doing nothing but play with his sailboarding ever since.