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@norman avatar
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Hooked
1978 MotoVespa 160GT, 2009 LML Star 2T (Stella), 1961 Lambretta S2
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Location: Belgium
 
Hooked
@norman avatar
1978 MotoVespa 160GT, 2009 LML Star 2T (Stella), 1961 Lambretta S2
Joined: UTC
Posts: 412
Location: Belgium
UTC quote
As part of my engine rebuild, I replaced the mounting bushes. After just a few minutes riding (still setting up the carb) I noticed that the inner metal part of the bush has started to work its way out of the rubber. It seems that the shock mounting is wider than the engine mount. Is this normal or should I try and space the gap with washers?
Mind the gap!
Mind the gap!
@roland87 avatar
UTC

Molto Verboso
'13 LML Star 200, '81 50 Special, '81 P 150 X, '87 PK 50 Nuova, '84 PK 50 S
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Location: Ukraine. Kyiv.
 
Molto Verboso
@roland87 avatar
'13 LML Star 200, '81 50 Special, '81 P 150 X, '87 PK 50 Nuova, '84 PK 50 S
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UTC quote
It is normal shock mount wide. I noticed that this metal tube always tend to slide onto side and decentering.
You can try to press metal tube to center it. But I also noticed that if it starts to slide once it will slide again and again.

This is SIP bush, I thought that it can help with tube sliding into it and mounted it on my P and PK.
External inline image provided by member with no explanatory text

But just now checked on my PK and... it was hold only for 700 km after new SIP bush was mounted. Maybe someone knows better what can causing tube sliding? I can guess only main engine bushes but on my PK it is new and have no any damages or worn.
Forum member supplied image with no explanatory text
OP
@norman avatar
UTC

Hooked
1978 MotoVespa 160GT, 2009 LML Star 2T (Stella), 1961 Lambretta S2
Joined: UTC
Posts: 412
Location: Belgium
 
Hooked
@norman avatar
1978 MotoVespa 160GT, 2009 LML Star 2T (Stella), 1961 Lambretta S2
Joined: UTC
Posts: 412
Location: Belgium
UTC quote
Mine is this version from BGM:
https://www.scooter-center.com/en/silent-block-set-shock-absorber/engine-bgm-pro-made-in-germany-oe-10mm-x-48mm-vespa-px-1984-t5-125cc-pk-bgm7956

I'll see if I can push it back in and add a couple of washers as spacers to stop it moving again.
@gickspeed avatar
UTC

Ossessionato
Joined: UTC
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Location: Racing Capital of the World
 
Ossessionato
@gickspeed avatar
Joined: UTC
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Location: Racing Capital of the World
UTC quote
norman wrote:
Mine is this version from BGM:
https://www.scooter-center.com/en/silent-block-set-shock-absorber/engine-bgm-pro-made-in-germany-oe-10mm-x-48mm-vespa-px-1984-t5-125cc-pk-bgm7956

I'll see if I can push it back in and add a couple of washers as spacers to stop it moving again.
Did you by chance use grease/oil/spray lubricant to mount the tube in the rubber bushing?
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@norman avatar
UTC

Hooked
1978 MotoVespa 160GT, 2009 LML Star 2T (Stella), 1961 Lambretta S2
Joined: UTC
Posts: 412
Location: Belgium
 
Hooked
@norman avatar
1978 MotoVespa 160GT, 2009 LML Star 2T (Stella), 1961 Lambretta S2
Joined: UTC
Posts: 412
Location: Belgium
UTC quote
GickSpeed wrote:
Did you by chance use grease/oil/spray lubricant to mount the tube in the rubber bushing?
No, it came as a single piece, ready-assembled.
@gickspeed avatar
UTC

Ossessionato
Joined: UTC
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Ossessionato
@gickspeed avatar
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Location: Racing Capital of the World
UTC quote
norman wrote:
No, it came as a single piece, ready-assembled.
I would go another direction then. Use the SIP bushing with a 9mm tube. My .02 cents.
@roland87 avatar
UTC

Molto Verboso
'13 LML Star 200, '81 50 Special, '81 P 150 X, '87 PK 50 Nuova, '84 PK 50 S
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Location: Ukraine. Kyiv.
 
Molto Verboso
@roland87 avatar
'13 LML Star 200, '81 50 Special, '81 P 150 X, '87 PK 50 Nuova, '84 PK 50 S
Joined: UTC
Posts: 1213
Location: Ukraine. Kyiv.
UTC quote
I use 20mm socket to hold bush on place and long bolt to push metal tube.
Forum member supplied image with no explanatory text
Done. And will look for how long it stay there.
Done. And will look for how long it stay there.
OP
@norman avatar
UTC

Hooked
1978 MotoVespa 160GT, 2009 LML Star 2T (Stella), 1961 Lambretta S2
Joined: UTC
Posts: 412
Location: Belgium
 
Hooked
@norman avatar
1978 MotoVespa 160GT, 2009 LML Star 2T (Stella), 1961 Lambretta S2
Joined: UTC
Posts: 412
Location: Belgium
UTC quote
Had a good look at it today. In fact, I don't think it's a problem. The inner metal tube is as long as it can be between the sides of the shock, so it's going nowhere. There's not even space for a single washer. The rubber bush is the same width as the engine mount so as long as it stays there all is good.
@roland87 avatar
UTC

Molto Verboso
'13 LML Star 200, '81 50 Special, '81 P 150 X, '87 PK 50 Nuova, '84 PK 50 S
Joined: UTC
Posts: 1213
Location: Ukraine. Kyiv.
 
Molto Verboso
@roland87 avatar
'13 LML Star 200, '81 50 Special, '81 P 150 X, '87 PK 50 Nuova, '84 PK 50 S
Joined: UTC
Posts: 1213
Location: Ukraine. Kyiv.
UTC quote
roland87 wrote:
I use 20mm socket to hold bush on place and long bolt to push metal tube.
And after only 210 km tube was slide again. Don't know what to do to prevent it. Will try to change rubber bush.
Forum member supplied image with no explanatory text
UTC

parallelogramerist
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parallelogramerist
Joined: UTC
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UTC quote
roland87 wrote:
And after only 210 km tube was slide again. Don't know what to do to prevent it. Will try to change rubber bush.
For a shock on one of my P's, i created a spacer washer out of 1/8" thick HDPE plastic (cutting board). The i.d. of the washer slips over the spacer tube, and the o.d. is about the same diameter at the shock mount on the engine case. I installed one on each side of the shock bracket.
@moto64 avatar
UTC

Molto Verboso
'64 Motovespa 150S (177) , '65 VBB, '66 Allstate SF, '66 180SS
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Location: S.Salem, NY
 
Molto Verboso
@moto64 avatar
'64 Motovespa 150S (177) , '65 VBB, '66 Allstate SF, '66 180SS
Joined: UTC
Posts: 1836
Location: S.Salem, NY
UTC quote
I am guessing that there is some 'lean' to the motor due to normal silent block wear and the pin is not square to the shock so it walks to one side. Operation-wise, it shouldn't make any difference at all other than metal-to-metal contact between the shock bracket and the lug. Stick a washer in there.
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