We may have installed the clutch seal from the crank side instead of the clutch side. common assembly mistake given the GS160 parts manual diagram illustration is incorrect. According to Gene Meredith of Scooters Originali, the GS/SS are the only Vespa motors the clutch seal is installed from the clutch side before the bearing. the GS160 shop manual drawing and directions confirm this assembly sequence.
this assembly photo shows the bearing installed, which confirms we installed the seal from the crank sidehttps://www.flickr.com/photos/barthlow/ ... ed-public/
here's a past discussion on Modern Vespa:http://modernvespa.com/forum/topic150023
Recent discussion on GS/SS grouphttps://groups.yahoo.com/neo/groups/ves ... s/messages
"If the seal is seated at idle it would run fine. We had to fix 3 GSs from another shop where this seal was put in back wardsâ€¦ im thinking that its under load that the seal pops or spins out. Just running through the issues I have seen on GS/SS. At least you can split a GS case in the engine with just minimal prep work and then you could see behind the crank to check that sealâ€¦"
Scooters Originali LLC
924 Marcon Blvd, Ste 105
Allentown PA 18109www.scootersoriginali.com