I've just put back the cases together on the Rally overhaul (8 bolts present) and noticed this hole. Im convinced there was nothing in there when I disassembled it.
If this is completely obvious please feel free to abuse my incompetence

![]() Sat Mar 01, 2014 1:38 pm
Hooked
'65 Sprint 177/ '17 GTS300
Joined: 28 Oct 2013
Posts: 456 Location: Dorset, UK |
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Cant figure out what goes in here?!
I've just put back the cases together on the Rally overhaul (8 bolts present) and noticed this hole. Im convinced there was nothing in there when I disassembled it. If this is completely obvious please feel free to abuse my incompetence ![]() |
![]() Sat Mar 01, 2014 2:16 pm
Veni, Vidi, Posti
1975 Vespa GTR 125, 1976 Vespa V90 (Resto), 2001 Vespa ET4 125 (Sold), 2009 Vespa GTS300 Super
Joined: 05 Sep 2010
Posts: 6064 Location: Northants UK |
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Veni, Vidi, Posti
![]() 1975 Vespa GTR 125, 1976 Vespa V90 (Resto), 2001 Vespa ET4 125 (Sold), 2009 Vespa GTS300 Super
Joined: 05 Sep 2010
Posts: 6064 Location: Northants UK |
![]() Sat Mar 01, 2014 3:31 pm
Veni, Vidi, Posti
px200 cutdown,px180,px150. Puch SR. Puch scooterette
Joined: 08 Apr 2009
Posts: 5109 Location: west aus |
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Veni, Vidi, Posti
![]() px200 cutdown,px180,px150. Puch SR. Puch scooterette
Joined: 08 Apr 2009
Posts: 5109 Location: west aus |
![]() Sun Mar 02, 2014 1:17 am
Hooked
'65 Sprint 177/ '17 GTS300
Joined: 28 Oct 2013
Posts: 456 Location: Dorset, UK |
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Yes...all four case bolts are in, in that particular area...
It does appear to be a case bolt because it goes into a blind hole (will check if its threaded, ive just run out of bolts!) Its an odd one because this version from SIP just hasnt got it there. http://www.sip-scootershop.com/en/products/crankcases+piaggio+for+vespa+_43352000 Its not a stator plate hole though because those three are raised and this hole sits at the back |
it's vestigial, kind of like an appendix.
Pre-P 125/150 engines, of witch the Rally was basically evolved from had that top case bolt in a different position. it was moved to accommodate the longer rotary pad cutout on the 200's and the P's. there's other vestigial bits on later cases from earlier features; the side transfers on 200's are another example.
Positive
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![]() Sun Mar 02, 2014 1:21 pm
Hooked
'65 Sprint 177/ '17 GTS300
Joined: 28 Oct 2013
Posts: 456 Location: Dorset, UK |
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![]() Sun Mar 02, 2014 1:40 pm
Veni, Vidi, Posti
1975 Vespa GTR 125, 1976 Vespa V90 (Resto), 2001 Vespa ET4 125 (Sold), 2009 Vespa GTS300 Super
Joined: 05 Sep 2010
Posts: 6064 Location: Northants UK |
|
Veni, Vidi, Posti
![]() 1975 Vespa GTR 125, 1976 Vespa V90 (Resto), 2001 Vespa ET4 125 (Sold), 2009 Vespa GTS300 Super
Joined: 05 Sep 2010
Posts: 6064 Location: Northants UK |
Mr. Clean
![]() P,SUPER,V90, 50 Special
Joined: 27 Jul 2010
Posts: 10207 Location: This is't my locker! |
it's only early P cases that have it- later revision molds didn't incorporate that bit.
funny enough, pre-P cases have a vestigial lump in roughly the same area as the later stud, even to the extent of having a hole in the gasket there. That's a vestige of an alignment pin used on VNAs to align the case halfs, like the pin down by the oil drain hole in the bottom of the case. later cases went to using a raised lip around the crankshaft hole and the upper alignment pin was omitted. Quote: Thumbs up for Rob.. for constantly sharing his wealth of knowledge on this stuff. Just to throw it out there- i hope some out there pay the favor back- i'm close to launching a full online ordering website to branch out in the mail order side of my business. it'll be an automated way to special order pretty much anything SIP carries.
Positive
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![]() Sun Mar 02, 2014 8:21 pm
Ossessionato
ET2, PX150
Joined: 15 Jun 2007
Posts: 3410 Location: Denver CO |
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rob hodge wrote: bah. no problem. you'd be shocked the shit i've got floating around in my head about these things. Just to throw it out there- i hope some out there pay the favor back- i'm close to launching a full online ordering website to branch out in the mail order side of my business. it'll be an automated way to special order pretty much anything SIP carries. |
![]() Wed May 21, 2014 10:18 am
Hooked
1974 Rally (3), 1971 Rally 180, 1960 Li 125
Joined: 20 Mar 2014
Posts: 424 Location: Southern California, USA |
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Hooked
![]() 1974 Rally (3), 1971 Rally 180, 1960 Li 125
Joined: 20 Mar 2014
Posts: 424 Location: Southern California, USA |
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