MOPED ARMY

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I ran a Puch with a Metrakit with a with a 20mm tilliotson pumper carb last season. It worked pretty OK.

Pros

- At WOT it was awesome

- It was easy to tune (external set screws). I could go from totally untuned to rideable in like 20 min.

- If I ran it a little lean I had great low end throttle response.

- Its a small carb that you can mount upside down and sideways.

Cons

- It was easy to tune (external set screws). I was always messing with it during rides. Hard to set and forget.

- I had to run it a little lean to get great low end throttle response.

- It sprayed gas out the back like crazy. You could see the mist. I had gas-leg all the time. An air filter helped this a lot.

- There was a dead spot in the mid range that was hard to get rid of.

- If it sat for a while (like a week) you had to pump it like crazy to get it to start. Like maybe a block. After that it was quarter kick. I think either I wasn't getting enough pulse from the intake or oil seeped in and filled the little spaces between the pumpers.

I uploaded an image of it mounted. I'd say it was pretty fun for 25 bucks on ebay.

This was my set up.

Always thought it would work better with reeds, but you would have to bypass them for the pulse signal. But yeah, fog of gas always, filter would get wet, too easy to fiddle with and I also had a problem that once the ped got hot, it wouldn't work as well.

more pics

and the last one

for some reason this site only likes jpg nothing else :S

From some of problems people reported sounded like miss adjusted carbs. Those carbs actually have 3 major adjustments. One of them is internal and takes a pressure gauge.

-naz

Yeah, adjusting the needle valve pressure is a pain in the ass. That's the part that finally made me just quit them.

you're likely to see a lot of tilliotson pumper carb powered mopeds pretty soon. turns out if you do a good job, they work awesome

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i don't know what you guys are talking about.