ESE's works engine tuner

[speedpro]

What about using a boost control PWM solenoid to bleed away the vacuum signal from the powerjet? You'd have a normal powerjet circuit but with a T-junction with the solenoid off to the side. When you don't want the powerjet to supply fuel energize the solenoid to allow air to be drawn in rather than fuel to be drawn in via the jet. If it was progressive via the PWM control you would have air mixing with the petrol from the jet before it got to the powerjet tube in the throat of the carb. The desired fuel would get there that little bit quicker due to the airflow which it would mix with plus instead of globs of fuel it would be a mix of fuel and air.

I had a much less sophisticated version on my turbo McIntosh but it resulted in the same outcome. A mixture or air and fuel entered the opening of the carb through the "jet"

[Frits Overmars]

My understanding was in the Aprilia they originally used a stepper motor and it could progressively shut off the flow I assume using a needle valve.
It was an idle control stepper motor off a Fiat uno. I think they later went to a Keihin part.

Exactly
...

[ken seeber]

PISTON PIN PLUGS.

As it turns out, Vortex have been making plugs for their 60 cc MiniRok kart engine for some years. So, if you've got an engine with a 12 mm pin, here's your chance. Approx 15 Euro each from Mondo Karts. Looks like some form of PEEK high temp material and most likely from bar stock.

Begs the question as to whether they do (or could do) a version for their (or any) KZ engine with the usual 15 mm pin. Obviously the dimensional relationship of the circlip groove to the adjacent piston skirt face would have to be maintained.

[jfn2]

I ordered a set of these awhile back but never did get them, so I made my own from torlon. I purchased a foot long rod and I have alot of material left-over. I designed them just like Frist's pictures and have had no problems. I used them on a KTM314 motor. Fantastic motor! It was used for GNCC racing here in the states.

[Peter1962]

I ordered a set of these awhile back but never did get them, so I made my own from torlon. I purchased a foot long rod and I have alot of material left-over. I designed them just like Frist's pictures and have had no problems. I used them on a KTM314 motor. Fantastic motor! It was used for GNCC racing here in the states.

314 ? Did you stroke the crankshaft ? Or is it a big bore ?

[jfn2]

Peter
Stroked 3.5mm with a clean-up bore. (72.16mm I think?) And it seems I was mistaken. The cc's only come out to 309cc's. I built a Yamaha engine to arround 314cc's or something like that.

[wobbly]

After alot of on line research here is what I believe is the simple/cheap version of a solenoid PJ , as the idiot price original is now NLA..
The tube solenoid just needs a threaded adapter to the much cheaper and still available Mikuni standard PJ kit , and a jet or insert fitted inside the holder that is much bigger than that used in say a Lectron powerjet system.

https://www.summitracing.com/search/...power-jet-kits

https://nz.element14.com/ledex/19520...ous/dp/1331806

Here is a setup I have cobbled together from bits I had in my parts boxes - perfect for Mr Pig if he wants it.
This combined with the lever type TPS ( same as PWK style ) now available on the new Lectron carbs would be the trickest setup.

[diesel pig]

This combined with the lever type TPS ( same as PWK style ) now available on the new Lectron carbs would be the trickest setup.

It must be new I could not find it on there site. Must not of updated the site yet.

[wobbly]

Can we get .mov video added to allowable file posting on here ?

[husaberg]

Can we get .mov video added to allowable file posting on here ?

I have asked the site techy administrator.

[Frits Overmars]

Can we get .mov video added to allowable file posting on here ?

I have asked the site techy administrator.

Having .PDF allowed would be fine too. I'm testing it now. So if I succeed, you can forget about this post.

[136kg136ps]

It worked for me Frits. Firefox and in the US.

[F5 Dave]

Android here, working well.

[Jonny snatchsniffer]

Hi all, 1st post on here but what a thread this is, taken a while to read but have a few pages left, brilliant

Re- polini carbs, out of the box they are proper shite and the reason being is that it doesn't have a normal 2 stroke needle shroud, this makes jetting nearly impossible with wot needing bigger jets an richer needles, I have one on my lambretta and had to get the lack of shroud pressed out and a normal one pressed out
I'd get a genuine pwk 33 or 35mm
I have a pwm 38mm on my 28hp vespa polini 130 road scoot and its easy to jet and needle

[wobbly]

I tested the Keihins back to back for the SKUSA Stock Honda classes , the PWM is easily the best.