Sun Jun 19, 2022 5:51 am

Lurker
P150S, Primavera 125, Lambretta 150 LD
Joined: 28 Feb 2022
Posts: 3
Location: Philadelphia PA
 
Lurker
P150S, Primavera 125, Lambretta 150 LD
Joined: 28 Feb 2022
Posts: 3
Location: Philadelphia PA
Sun Jun 19, 2022 5:51 am linkquote
I have a 1983 Vespa P150S ( Indo. model). WAS running but very poorly. would kick over and rev super high. could not get the carb adjusted with turns. I switched the carb, then kicked over and ran a few times very weak and would stall. Then I prob. flooded it. Would not fire up at all. for 2 days. Then- Totally cleaned my orig. Dellorto carb.- jets and all- and put it back on. Will not fire up at all. Has good spark. getting fuel. Tried starting fluid etc. Tried putting it in 2nd and bump starting- for another 2 days. Has mildly low compression- 90 psi. Any help as to how to get this fired up would be greatly appreciated! Thanks



Sun Jun 19, 2022 6:05 am

Ossessionato
Joined: 22 Oct 2011
Posts: 4928
Location: Tega Cay, SC
 
Ossessionato
Joined: 22 Oct 2011
Posts: 4928
Location: Tega Cay, SC
Sun Jun 19, 2022 6:05 am linkquote
You barely have enough compression to run it and it sounds like it also has an air leak. Honestly, I think there is no quick fix, an engine rebuild/refresh is in order.
Sun Jun 19, 2022 6:07 am

Ossessionato
Joined: 22 Oct 2011
Posts: 4928
Location: Tega Cay, SC
 
Ossessionato
Joined: 22 Oct 2011
Posts: 4928
Location: Tega Cay, SC
Sun Jun 19, 2022 6:07 am linkquote
Also, you will get more responses on the NSM side where the 2 stroke guys and girls hang out.
Sun Jun 19, 2022 6:31 am

Ossessionato
79 P200E (Ruby), 62 Allstate (B-62), 2008 Stella (Olive)
Joined: 11 Jan 2006
Posts: 3037
Location: Florence, OR
 
Ossessionato
79 P200E (Ruby), 62 Allstate (B-62), 2008 Stella (Olive)
Joined: 11 Jan 2006
Posts: 3037
Location: Florence, OR
Sun Jun 19, 2022 6:31 am linkquote
Have you changed the gear oil? Is there gas in the oil? If so, the clutch side seal is blown.

Also, I agree with Tierney. It sounds like an air leak. Check the flywheel side seal for a leak also.

Sorry man Hope this helps...
Sun Jun 19, 2022 6:41 am

Moderibbit
1980 P200E - "Old Rusty", 1976 ET3 Primavera
Joined: 12 Jun 2008
Posts: 8848
Location: Atlanta, GA
 
Moderibbit
1980 P200E - "Old Rusty", 1976 ET3 Primavera
Joined: 12 Jun 2008
Posts: 8848
Location: Atlanta, GA
Sun Jun 19, 2022 6:41 am linkquote
Tierney wrote:
You barely have enough compression to run it and it sounds like it also has an air leak. Honestly, I think there is no quick fix, an engine rebuild/refresh is in order.
^ +1
Sun Jun 19, 2022 10:36 am

Lurker
P150S, Primavera 125, Lambretta 150 LD
Joined: 28 Feb 2022
Posts: 3
Location: Philadelphia PA
 
Lurker
P150S, Primavera 125, Lambretta 150 LD
Joined: 28 Feb 2022
Posts: 3
Location: Philadelphia PA
Sun Jun 19, 2022 10:36 am linkquote
Ok, Thanks for the responses. I was hoping it was something easy, but thinking it was something like described. I'll have to pull the engine and start going through it!
Sun Jun 19, 2022 12:44 pm

Molto Verboso
GL, PK, PE200 with hack, Sears Rust Badge
Joined: 24 Apr 2012
Posts: 1298
Location: Deep in the heart of Texas
 
Molto Verboso
GL, PK, PE200 with hack, Sears Rust Badge
Joined: 24 Apr 2012
Posts: 1298
Location: Deep in the heart of Texas
Sun Jun 19, 2022 12:44 pm linkquote
DelaAdam wrote:
Ok, Thanks for the responses. I was hoping it was something easy, but thinking it was something like described. I'll have to pull the engine and start going through it!
You may get lucky and not need to pull the motor and just tiddy up the outside bits. Drop the gear oil and check for gas. If you smell gas in the gear oil, clutch seal is bad and splitting the cases is required to fix. If you don't smell gas you maybe home free.

Pull the head and cylinder and change piston rings since compression is a little low. New gasket with some motoseal and torque up head nuts to spec. Pull the flywheel and stator and change that seal for insurance. Just need to pick seal out and tap back in.

Hope that helps and you can avoid a case split.

Good luck!
Sun Jun 19, 2022 12:59 pm

Style Maven
'74 50s x3 '78 P200 E '84 Cosa '91 PK50XL2 '58 AllState '68 Sprint '80 50special and a '66(?) Super125
Joined: 22 Nov 2010
Posts: 8613
Location: seattle/athens
 
Style Maven
'74 50s x3 '78 P200 E '84 Cosa '91 PK50XL2 '58 AllState '68 Sprint '80 50special and a '66(?) Super125
Joined: 22 Nov 2010
Posts: 8613
Location: seattle/athens
Sun Jun 19, 2022 12:59 pm linkquote
I'd try this^^^ too if there's no gas in your transmission oil, and I would add a light hone on your cylinder. Also, check your plug when it won't start to see if it's wet or dry so yo KNOW if it's flooded or thirsty.
  DoubleGood Vespa Design  

All Content Copyright 2005-2022 by Modern Vespa. All Rights Reserved.

Modern Vespa is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com.

Shop on Amazon Smile with Modern Vespa

[ Time: 0.0264s ][ Queries: 7 (0.0064s) ][ Debug on ][ 211 ][ Thing One ]