Re: more vespa problems :-(

Chris S /
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Miguel,

The Grande definitely needs the airbox w/filter screen. Before I read your second post, I assumed that the mixture was too rich. Remember, the other vespa mopeds use essentially the same engine but with a slightly smaller carb and jet (12.10 with a 43). The Grande should have a 49 in it. Over time, I've experienced the exact symptoms (sometimes to greater degrees than other) with Vespas I've worked on as well as my 2 Grandes, two Ciaos and a Bravo...

It was caused by different things at different times. Here is what I have found to be the culprit (in no particular order):

1. clogged main jet

2. bad carb float

3. bad needle valve seal (caused once by a bad needle, once by a needle valve seat that had been widened by the previous owner)

4. bad HT coil

5. demagnetized flywheel

6. clogged idle jet (hard to find in a 12.12--it is a little hole in front of the brass tube in the venturi)

7. fouled/worn out spark plug

8. clogged fuel valve (petcock)

9. empty gas tank

10. air leak in carb (not installed fully)

11. ??? (I am working on a Grande for someone else right now and I can't seem to find the problem yet).

I think that covers it.

Good luck.

Chris

This single post is part of a larger thread. Start from the top or view this post in context.
Subject Written By Posted
  more vespa problems :-(Topic by: miguel miguel 11/05/01 03:22PM
  Re: more vespa problems :-(Re: XBrandon EdgeX XBrandon EdgeX 11/05/01 03:28PM
  Re: more vespa problems :-(Re: Ron Brown Ron Brown 11/05/01 04:07PM
  Re: more vespa problems :-(Re: miguel miguel 11/05/01 05:30PM
  Re: more vespa problems :-(Re: Mike (MA) Mike (MA) 11/05/01 05:35PM
  Re: more vespa problems :-(Re: Chris S Chris S 11/05/01 06:02PM
  Re: more vespa problems :-(Re: miguel miguel 11/05/01 06:19PM
  Re: more vespa problems :-(Re: Chris S Chris S 11/05/01 07:17PM
  Re: more vespa problems :-(Re: miguel miguel 11/05/01 07:37PM
  Re: I did once..Re: Jim C. Jim C. 11/05/01 10:23PM
  Re: I did once..Re: Chris S Chris S 11/05/01 11:38PM
  Re: At the beginning..Re: Jim C. Jim C. 11/06/01 11:02AM
  Re: At the beginning..Re: miguel miguel 11/06/01 12:18PM
  Re: At the beginning..Re: Ron Brown Ron Brown 11/06/01 02:58PM
  You could also check..Re: Jim C. Jim C. 11/06/01 10:24PM

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