Has anyone ever tried running the Puch E50 with a Walbro pulse carb, with a Juice Box, and an X-Can exhaust?
Has anyone ever tried running the Puch E50 with a Walbro pulse carb, with a Juice Box, and an X-Can exhaust?
bump
no long term successes with diaphragm carbs. Lots of people have tried, it just doesn't work really well on most moped motors.
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.
Thanks for your input guys. Walbro has come a ways with their carbs. To stop the spray they have return to tank tubes. I'll just run that under the front of the tank and drill for a small nipple at the top underside. They are great on Go-Peds in all rpm ranges, and easy to adjust and set. I plan on using a reed with mine along with a juice box. I have one on order; it's a HDA225-1 with a 20.56mm throttle body and 16.77mm venturi. Will also add a velocity stack to the package. Should be more than adequate for a ported OEM 50cc cylinder with a stuffed crank.
I'm going to try an X-Can exhaust with long(6in) stingers and an X-Port manifold. Can always go a different route with the pipe if need be; but should have excellent bottom end/torque with good topend as well. This is going on my kickstart E50 and should make for a nice compact powerplant.
more pics
another one
and the last one
Shit, These pics must be encrypted. I'll try a different tac latter.
for some reason this site only likes jpg nothing else :S
How do I load images directly onto the page?
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
...Punching you in face...
Yeah, adjusting the needle valve pressure is a pain in the ass. That's the part that finally made me just quit them.
I had someone else check the pop-off pressure when I rebuilt the carb and it was in the range of what people were telling me it should be on karting fourms. I don't have my own pop-off gauge so I never tuned it after that. It could have helped.
Also these carbs are famous for being difficult to tune the mid range. I read a bunch of times about people cutting a little notch in the throttle butterfly valve to fix this but I didn't try that either.
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
I guess the kitty is out of the bag at this point.
-naz
bump
yea Dean
i don't know what you guys are talking about.
Tell me more about this throttle notch thing
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