1980 Vespa Grande starting issues

Asparagoose Lamichhane /
This single post is part of a larger thread. Start from the top or view this post in context.

Hey all,

New to the forum and new to mopeds. Bought a 1980 grande a few months back, owner stated that it ran last year and had been sitting. Has ~3k miles on it.

Gas tank was in good shape but I flushed it anyways and made sure gas was flowing into the carb.

Cleaned the carb twice with carb cleaner and compressed air, including idle circuit. Held a flashlight up to confirm that the gap through jet and up into the needle is clear.

Compression tester shows ~150 pounds, can get it up to 200 if I keep pedaling. Of course it won't rise unless I let go of decomp lever, but once it is up to 150, 200, squeezing decomp again doesn't release the pressure. Is this supposed to happen?

It has spark when I pedal and hold it to the fins. I also tried a new spark plug, both have spark. No lights.

Plug smells like gas after I've tried pedaling.

Spraying carb cleaner or putting a little 50:1 premix directly into the plug hole, then replacing the plug/boot and pedaling does nothing.

Motor can sometimes be kind of difficult to turn by hand after I come back the next day. A little bit of blaster temporarily solves this. Also kind of hard to pedal but maybe that's normal for grandes?

Starter clutch stutters pretty frequently, I can always get it to engage and start turning the motor if I keep pedaling but maybe something I have to keep an eye on, or maybe related to the high compression number?

Choke changes nothing, throttle makes it make a deeper sound but still doesn't start. Trying to start with no air filter changes nothing.

This video is not me (from an old post with some guy and his Bravo) but similar to my situation. Anything that can be gleaned from the sound?:

Looking for any advice on next steps or things to look at, thank you!

This single post is part of a larger thread. Start from the top or view this post in context.
Subject Written By Posted
  1980 Vespa Grande starting issuesTopic by: Asparagoose Lamichhane Asparagoose Lamichhane 01/06/21 08:40PM
  Re: 1980 Vespa Grande starting issuesRe: Ľ̷̝̽͒i̶̛̼͑͠ȁ̸̧̛̽m̵̻̟̯̀̅ ̷͎̙̽̊F̶̲̺͑̓ F Ľ̷̝̽͒i̶̛̼͑͠ȁ̸̧̛̽m̵̻̟̯̀̅ ̷͎̙̽̊F̶̲̺͑̓ F 01/06/21 10:29PM
  Re: 1980 Vespa Grande starting issuesRe: Dirty30 Dillon Dirty30 Dillon 01/07/21 07:27AM
  Re: 1980 Vespa Grande starting issuesRe: Nick MBC Nick MBC 01/07/21 09:02AM
  Re: 1980 Vespa Grande starting issuesRe: Dirty30 Dillon Dirty30 Dillon 01/07/21 09:23AM
  Re: 1980 Vespa Grande starting issuesRe: pat splat pat splat 01/07/21 09:56AM
  Re: 1980 Vespa Grande starting issuesRe: Nick MBC Nick MBC 01/07/21 10:14AM
  Re: 1980 Vespa Grande starting issuesRe: Dirty30 Dillon Dirty30 Dillon 01/07/21 10:19AM
  Re: 1980 Vespa Grande starting issuesRe: Asparagoose Lamichhane Asparagoose Lamichhane 01/07/21 02:27PM
  Re: 1980 Vespa Grande starting issuesRe: Nick MBC Nick MBC 01/07/21 02:50PM
  Re: 1980 Vespa Grande starting issuesRe: Asparagoose Lamichhane Asparagoose Lamichhane 01/24/21 08:07PM
  Re: 1980 Vespa Grande starting issuesRe: Asparagoose Lamichhane Asparagoose Lamichhane 01/24/21 08:08PM
  Re: 1980 Vespa Grande starting issuesRe: pat splat pat splat 01/26/21 07:15PM
  Re: 1980 Vespa Grande starting issuesRe: Asparagoose Lamichhane Asparagoose Lamichhane 01/29/21 12:25AM
  Re: 1980 Vespa Grande starting issuesRe: Ike Pipe Ike Pipe 02/05/21 12:32PM

Want to post in this forum? We'd love to have you join the discussion, but first:

Login or Create Account