porting a vespa

Grande Deluxe /
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Ok, my stock 50 cc vespa cylinder is off my grande so i can do some cylinder work over the winter. i tried searching already and couldn't come up with much, so here are my questions.

1. I've read that the intake should still be a little rough to help mix the fuel/ air. Is this is the case with the exhaust, or should i make it as smooth as possible so the gasses evacuate the cylinder faster and allow the expansion chamber to work better?

2. what effect does thickening/ thinning the base gasket have on port timing and compression?

3. I've heard of finger ports and how they effect low end. Could I increase low end by lowering the transfer ports, but not cutting them all the way through to the base?

4. The exhaust port has to curve in order to avoid the lower cylinder head bolt. how do i get deeper in there to widen/ smooth out the exhaust port?

5. should I do anything other than widening the exhaust port? (lowering, raising)

6. does it mater if i make a new base gasket out of the papery gasket material instead of metal like the stock one?

7. Any other vespa porting tips short of buying a new cylinder? 50 cc for life!

By the way, I'm running a lightly milled head, a polini mod country pipe, a 13 mm dell'orto, and a mallossi red filter air box, and slightly lightened variator weights on a stock variator (lightened).

This single post is part of a larger thread. Start from the top or view this post in context.
Subject Written By Posted
  porting a vespaTopic by: Grande Deluxe Grande Deluxe 01/08/10 12:19PM
  Re: porting a vespaRe: Graham Motzing Graham Motzing 01/08/10 03:16PM
  Re: porting a vespaRe: jens jens 01/09/10 02:25AM
  Re: porting a vespaRe: Grande Deluxe Grande Deluxe 01/10/10 12:47PM
  Re: porting a vespaRe: jens jens 01/09/10 02:36AM
  Re: porting a vespaRe: Tate Tate 01/09/10 08:05PM
  Re: porting a vespaRe: Grande Deluxe Grande Deluxe 01/10/10 12:51PM
  Re: porting a vespaRe: tomtom tomtom 01/10/10 02:45PM
  Re: porting a vespaRe: Grande Deluxe Grande Deluxe 01/10/10 11:25PM
  Re: porting a vespaRe: Organ Robbin' Organ Robbin' 01/11/10 11:40AM
  Re: porting a vespaRe: Grande Deluxe Grande Deluxe 01/12/10 03:08PM
  Re: porting a vespaRe: Organ Robbin' Organ Robbin' 01/12/10 03:25PM
  Re: porting a vespaRe: Grande Deluxe Grande Deluxe 01/13/10 12:15PM
  Re: porting a vespaRe: Organ Robbin' Organ Robbin' 01/13/10 12:22PM
  Re: porting a vespaRe: jens jens 01/13/10 05:13PM
  Re: porting a vespaRe: Grande Deluxe Grande Deluxe 01/13/10 08:26PM
  Re: porting a vespaRe: Graham Motzing Graham Motzing 01/14/10 12:35PM
  Re: porting a vespaRe: Organ Robbin' Organ Robbin' 01/14/10 12:54PM
  Re: porting a vespaRe: Graham Motzing Graham Motzing 01/14/10 04:39PM
  Re: porting a vespaRe: Organ Robbin' Organ Robbin' 01/14/10 05:21PM
  Re: porting a vespaRe: Sigmond Colón Sigmond Colón 01/15/10 01:00AM
  Re: porting a vespaRe: Tate Tate 01/15/10 01:53AM
  Re: porting a vespaRe: Graham Motzing Graham Motzing 01/15/10 10:37AM
  Re: porting a vespaRe: Organ Robbin' Organ Robbin' 01/15/10 11:11AM
  Re: porting a vespaRe: Grande Deluxe Grande Deluxe 01/21/10 06:49PM
  Re: porting a vespaRe: Grande Deluxe Grande Deluxe 01/22/10 05:39PM
  Re: porting a vespaRe: the worst terry the worst terry 01/23/10 01:46PM
  Re: porting a vespaRe: Josh G Josh G 01/23/10 03:21PM
  Re: porting a vespaRe: Grande Deluxe Grande Deluxe 01/24/10 11:36AM
  Re: porting a vespaRe: Graham Motzing Graham Motzing 01/25/10 04:52PM

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