Lectron Carbs

[guest1406]

Just picked up second hand one.

http://www.lectronfuelsystems.com/carburetor/lectron_44mm_power_jet_high_velocity_carburetor.html

anyone use one before or any knowledge of them? Ive never heard of them before so doing some research

Mackenzie

[JOOLZ]

I used one on my Hagon J.A.P 500 that I used for sprinting many years ago. No jets just a metering rod to control fuel flow, make it richer or leaner by adjusting the nut at the top of the metering rod, If it is out of range then you go 1 rod higher or lower depending if its lean or rich. The power jet takes care of the fuel from 3/4 up to full throttle. Really best for wide open operation only, but some people have used them on road bikes successfully. They used to be very popular with drag bike racers

[guest1406]

Cheers Joolz, dont suppose you have any pics or info on your JAP? Big sucker for JAP engines!!

I did a fair bit of research and they seem so simple! Parts are a git to get hold of, all in the states.

I'm itching to get it on and try it.

Mackenzie

[JOOLZ]

There is a photo of it at the beginning of this video.   

          Sorry about the quality its the only photo of it I had left. It used to be a long track bike with a Burman 3 speed box and I ran it with a Honda rear wheel and a Suzuki ZR50 front end

[guest1406]

Joolz that's a crazy looking machine! They all your builds

Did you tune the lectrons yourself?

Mackenzie

[JOOLZ]

They are some of the bikes I have built, I moved around a lot so have lost a lot of photos over the years, and others I did not photograph. I set up the Lectron carb myself not that difficult, I think I was about 18 when I built that bike and not nearly so knowledgeable in those days, so it couldn't have been that difficult to do

[guest1406]

Impressive collection, do you build and sell or build for fun?

When I set up the Lectron I may have to pick your brain Joolz. I did read a lot about them and tuning so I should be ok. Im just unsure about the metering rod size and the power jet size

Mackenzie

[JOOLZ]

I always build for myself, but if anyone was interested and offered the right price I would sell them and start the next project, hence I have owned about 80 motorcycles in my time, most of them bought as scrap or were dogs, and I would do them up to various degrees, some I would just get up and running, and others I would spend a lot of time effort and money on.
I will help as much as I can with the Lectron, give me a shout if you need help

[Propellor]

So the lectron has more of a rod with a taper on it than a needle? Have I got that right? Also, what's that tube which goes from the bottom of the float bowl to above the Venturi, on the outside, with some sort of adjusting screw on top?

The idea of a clear float bowl seems pretty good. See at a glance if your levels are all a kilter.

Cheers.

[JOOLZ]

The Lectron metering rod is similar to a needle, but one side of it is flat, the venturi in the carb is positioned in such a way that a low pressure area is created just behind the needle which causes the fuel to be drawn up and atomized much more finely than with a traditional needle, it also allows a certain amount of self compensation with air pressure changes which keeps the mixture ratio spot on even when going up a mountain. The pipe which comes from the float bowl is the high speed circuit that covers 3/4 throttle up

[Propellor]

The Lectron metering rod is similar to a needle, but one side of it is flat, the venturi in the carb is positioned in such a way that a low pressure area is created just behind the needle which causes the fuel to be drawn up and atomized much more finely than with a traditional needle, it also allows a certain amount of self compensation with air pressure changes which keeps the mixture ratio spot on even when going up a mountain. The pipe which comes from the float bowl is the high speed circuit that covers 3/4 throttle up

Thanks joolz.

 I was just reading a bit more about them. The tube seems to be the "passage" that feeds the power jet, which I think is pretty much what you've just said? The slide prevents it from working until near full throttle, which is what you've pretty much just said!

When you say the low pressure region is just behind the "needle", you mean on the flat side of the "needle"? Lectron seem to refer to it as a metering rod and I can now see why.

I must admit,  in theory it does seem to be a bit simpler than the traditional slide carb with its overlaying "regions" or stages.  There doesn't even seem to be a slide cutaway with the lectron system, or idle jet.

Thanks again.

[guest564]

Most of the Lectrons that I've seen were fitted to RDs or TZs, I would think that the needle would be quite wrong for a four stroke. Years ago I experimented with a similar carb, an EI Blue Magnum, on a SR250 based café racer but I couldn't get a four stroke needle.

[Propellor]

Most of the Lectrons that I've seen were fitted to RDs or TZs, I would think that the needle would be quite wrong for a four stroke. Years ago I experimented with a similar carb, an EI Blue Magnum, on a SR250 based café racer but I couldn't get a four stroke needle.

Hi rhinoman.

Mmm. Interesting. In what way wrong? I'm asking because I'm that taken by the principle I'm even considering giving one a try. I only have four strokes.

I have a 250rs which I want to liven up a bit. Plus a gpz500 on which I'm hoping to ditch the airbox. But I've been observing/helping a mate who's trying to do that with his er5 and having all sorts of trouble getting the cv carbs to run properly without it.

Waddya know about cv carbs? I started a thread on cv carbs and would be interested in your thoughts.

Cheers.

[guest564]

It ran way too rich, I could adjust the height of the needle and get it running reasonably well at either low RPM, mid-RPM or high-RPM but not across the entire rev range, when it was in its sweet spot it did pull like a train though. I actually swapped it out for an RS carb and then for a 34mm AMAL. CVs are a bitch to tune, often the problem with ditching the air box is that the air-corrector passageway is then too large. You used to be able to get jet kits (Dyno-Jet) for CVs, most of them required the air corrector hole to be drilled and tapped so a screw in jet could be fitted.

[guest1406]

The more I read up about the Lectron carbs, the more excited i get to try it out! When I get it on ill make a post and say whats what. Im hoping it the Lectron 34mm will be healthier and more efficient then the Mikuni TMX 38mm thats on now.

Joolz do you know where I can get parts? There's a few bits missing i need and only american sites seem to stock parts.

Mackenzie