OP
@moto64 avatar
UTC

Molto Verboso
'64 Motovespa 150S (177) , '65 VBB, '66 Allstate SF, '66 180SS
Joined: UTC
Posts: 1897
Location: S.Salem, NY
 
Molto Verboso
@moto64 avatar
'64 Motovespa 150S (177) , '65 VBB, '66 Allstate SF, '66 180SS
Joined: UTC
Posts: 1897
Location: S.Salem, NY
UTC quote
Do the springs get weak over time ? What are the typical symptoms of a bad cush drive ?
I have a pretty obvious rattle right between on-the-gas and off. I can roll the throttle in and out of the sound at pretty much any speed above about 30. I had a similar sound with an exhaust leak on two other two strokes but this sounds more metallic and the exhaust is buttoned up tight. I also pulled the clutch and it's all sound.
I have isolated or eliminated virtually every vibration I can find but this sure sounds internal and was wondering if it's the cush drive ring gear and the X-mas tree rattling between driving and being driven. Make sense ?
Edit: did a google search and found some posts. Sounds like a CD with bad/broken springs mainly causes what feels like a snatchy clutch. That is not the case...smooth as can be. I guess I could always pull it out and take a look.
UTC

Addicted
1968 VBB150
Joined: UTC
Posts: 703
Location: OC
 
Addicted
1968 VBB150
Joined: UTC
Posts: 703
Location: OC
UTC quote
Maybe this is the life of an SS owner- ride, pull motor. disassemble. Reassemble ride more lol
@killo avatar
UTC

Ossessionato
I have a few scooters....
Joined: UTC
Posts: 2226
Location: San Antonio, TX
 
Ossessionato
@killo avatar
I have a few scooters....
Joined: UTC
Posts: 2226
Location: San Antonio, TX
UTC quote
I think if your cush springs are broken, you'll also get more of a clunk when changing gears too.
@socalguy avatar
UTC

bodgemaster
63 GL, 76 Super (x2), 74 Primavera (x2), 79 P200, 06 Fly 150
Joined: UTC
Posts: 7157
Location: So Cal
 
bodgemaster
@socalguy avatar
63 GL, 76 Super (x2), 74 Primavera (x2), 79 P200, 06 Fly 150
Joined: UTC
Posts: 7157
Location: So Cal
UTC quote
You’ll usually feel broken cush springs pulling away from a stop ... scoot will lurch and buck when the clutch is released. Sometimes hard to distinguish from grabby clutch, so rule out clutch first.
UTC

Ossessionato
Vespas 1964 GS160, 1965 SS180, 1977 V9A1T, 1983 PX150E
Joined: UTC
Posts: 2537
Location: Siam
 
Ossessionato
Vespas 1964 GS160, 1965 SS180, 1977 V9A1T, 1983 PX150E
Joined: UTC
Posts: 2537
Location: Siam
UTC quote
I had a similar rattling noise in my SS clutch as well. It was the usual, pull the clutch lever in and it quiets down. The cush drive was rebuilt so couldn’t be that, but after further inspection of the clutch, I noticed the gear cluster that is riveted to the plate furthest back was loose. I just peened the rivets down tight. That made a lot of difference. Now it is much quieter. Maybe check that on yours.
OP
@moto64 avatar
UTC

Molto Verboso
'64 Motovespa 150S (177) , '65 VBB, '66 Allstate SF, '66 180SS
Joined: UTC
Posts: 1897
Location: S.Salem, NY
 
Molto Verboso
@moto64 avatar
'64 Motovespa 150S (177) , '65 VBB, '66 Allstate SF, '66 180SS
Joined: UTC
Posts: 1897
Location: S.Salem, NY
UTC quote
Thanks. I just had the clutch out and didn't notice anything wrong with it but of course I didn't take it apart. There's no noise or change in noise when I disengage the clutch nor does it feel grabby but it is pretty easy to check that again.
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