Modern Vespa

Wow! Are parts always this difficult to find?

Seems like you could buy some type of replacement carb for $96.

If you are looking for the black rubber bellows like in the photo below, you can get them from any Harley-Davidson dealer. They used Keihin CV40 carbs for years. I used the bellows from a CV40 on another members GT200 about four years ago.

-craig

No, in general parts are not hard find. Just accelerator pump bellows for some reason (and float bowl gaskets too, take care of the one you have). I left a bellows on my desk yesterday in case you wanted it and didn't want to spend $96 on a complete float bowl that sometimes comes with a bellows and sometimes doesn't. I'll be back Monday.

Try Af1 Racing:
https://www.af1racing.com/store/Scripts/prodList.asp?idCategory=2682

Select the link to your 2006 GT & find the part in that spare parts catalogue.

https://www.af1racing.com/store/ProdImages/st3/EVG2000US2.pdf

Try page 31. There is a acceleration pump kit listed: CM156708 It is described as a complete float chamber when checking for part availability.

https://www.af1racing.com/store/Scripts/prodView.asp?idProduct=31810

You should be able to find other suppliers by searching the site.

Hey Max, are we talking about the whole pump as shown by Craigs picture? I was on your website before I posted and I did not see this part. I would also like to talk to you about this whole Vespa key thing. Robert

If you are looking for the black rubber bellows like in the photo below, you can get them from any Harley-Davidson dealer. They used Keihin CV40 carbs for years. I used the bellows from a CV40 on another members GT200 about four years ago.

-craig

If you are actually pushing fuel past the accelerator pump position (the silver colored part in my photo above) I would suspect two possible problems.

1) the tiny passageways leading from the accelerator pump to the throat of the carb are plugged. When the piston moves, the fuel has nowhere to go but past the piston and the bellows. In the photo below the accelerator pump nozzle is circled. When you twist the throttle you should get a strong spray off fuel from the nozzle. If not the passages or nozzle are likely plugged.

Or

2) your accelerator pump position is so worn that the fuel just passes freely past it and leaks out the bellows.

There is no real "seal" in this design. #1 above is the most likely scenario. The float bowl and carb body need to be disassembled and soaked in carb cleaner for a week or so. Or ultra sonic cleaning is faster.


Thanks for responding Craig. I'll take it off and get it soaking. I appreciate your help.













-craig

If you are looking for the black rubber bellows like in the photo below, you can get them from any Harley-Davidson dealer. They used Keihin CV40 carbs for years. I used the bellows from a CV40 on another members GT200 about four years ago.

-craig