Vespa Grande Compression

Joe Slattery /

Recently bought a Grande. Got it running, but it has low power. Ran compression test got 90 psi. Bought a new cylinder and piston from Treatland, no change in the compression. Replaced the head with one that has a good decompression valve, but still low compression. The stroke travel of the piston is what it should be.

I'm stumped.

Subject Written By Posted
  Vespa Grande CompressionTopic by: Joe Slattery Joe Slattery 12/04/17 11:29AM
  Re: Vespa Grande CompressionRe: Dirty30 Dillon Dirty30 Dillon 12/04/17 12:11PM
  Re: Vespa Grande CompressionRe: P D P D 12/04/17 12:40PM
  Re: Vespa Grande CompressionRe: DrGeorgeTompson (Alan) DrGeorgeTompson (Alan) 12/04/17 01:34PM
  Re: Vespa Grande CompressionRe: Marc Friedman Marc Friedman 12/04/17 04:04PM
  Re: Vespa Grande CompressionRe: Joe Slattery Joe Slattery 12/06/17 12:14PM
  Re: Vespa Grande CompressionRe: Marc Friedman Marc Friedman 12/06/17 12:15PM
  Re: Vespa Grande CompressionRe: Moped Lar (OFMC) Moped Lar (OFMC) 12/06/17 12:23PM
  Re: Vespa Grande CompressionRe: Marc Friedman Marc Friedman 12/06/17 12:25PM
  Re: Vespa Grande CompressionRe: cheetahchrome . cheetahchrome . 12/04/17 06:11PM
  Re: Vespa Grande CompressionRe: Marc Friedman Marc Friedman 12/04/17 06:15PM
  Re: Vespa Grande CompressionRe: pat splat pat splat 12/04/17 09:58PM
  Re: Vespa Grande CompressionRe: Bad Cadillac™ Bad Cadillac™ 12/05/17 06:53AM
  Re: Vespa Grande CompressionRe: Joe Slattery Joe Slattery 12/05/17 05:59PM
  Re: Vespa Grande CompressionRe: Glenn Kuehn Glenn Kuehn 12/05/17 02:39PM
  Re: Vespa Grande CompressionRe: Glenn Kuehn Glenn Kuehn 12/06/17 01:30PM
  Re: Vespa Grande CompressionRe: Marc Friedman Marc Friedman 12/06/17 02:30PM
  Re: Vespa Grande CompressionRe: Joe Slattery Joe Slattery 12/06/17 04:05PM
  Re: Vespa Grande CompressionRe: DrGeorgeTompson (Alan) DrGeorgeTompson (Alan) 12/06/17 04:08PM
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