OP
UTC

Member
Px125e
Joined: UTC
Posts: 16
Location: Leicester, England
 
Member
Px125e
Joined: UTC
Posts: 16
Location: Leicester, England
UTC quote
Hello all! I'm new to all this and to building vespa's so here goes! I have a 1984 PX 125 e vespa and I have had an oil leak and a compression problem with it so I'm rebuilding the engine! I've taken the cylinder head off and as suspected there's lots of oil and crap there more than normal! I know the piston rings are normally 52.5m for my bike but there is no number on the top of the piston. Also on the under side of the head there is a number which is 150 s 990176 6a this is confusing me! Is a 150cc head? Would that fit a 125cc? Could the engine be a 150cc? Any help from you guys will be massively appreciated!! Thanks!
Forum member supplied image with no explanatory text
@ricky_cantley avatar
UTC

Hooked
Vespa 125GTR p125x p200
Joined: UTC
Posts: 368
Location: Kent
 
Hooked
@ricky_cantley avatar
Vespa 125GTR p125x p200
Joined: UTC
Posts: 368
Location: Kent
UTC quote
A 150 head will fit on a 125 with the correct piston and barrel this is not an unusual upgrade, I think the 125 would be stamped 125 both the ones I have worked on were. BORE - P125X 52.5mm, P150X 57.8mm

Ricky
OP
UTC

Member
Px125e
Joined: UTC
Posts: 16
Location: Leicester, England
 
Member
Px125e
Joined: UTC
Posts: 16
Location: Leicester, England
UTC quote
Thanks For the help Ricky!
⬆️    About 1 month elapsed    ⬇️
OP
UTC

Member
Px125e
Joined: UTC
Posts: 16
Location: Leicester, England
 
Member
Px125e
Joined: UTC
Posts: 16
Location: Leicester, England
UTC quote
Hello again! So I'm thinking of putting a kit on my vespa either a 166 malossi or a 177 polini which kit would be the best? now these are both full cylinder piston and all that but what else would I need? I'm looking at a new exhaust but would I need a new carb or air filter? Any advise would be extremely helpful!
Take care
@v_oodoo avatar
UTC

Style Maven
'74 50s x3 '87 PK125XL '92 PK50XLS Plurimatic - & - '58 AllState '68 Sprint '66(?) Super125 and '72 DanMotor Super150
Joined: UTC
Posts: 9600
Location: seattle/athens
 
Style Maven
@v_oodoo avatar
'74 50s x3 '87 PK125XL '92 PK50XLS Plurimatic - & - '58 AllState '68 Sprint '66(?) Super125 and '72 DanMotor Super150
Joined: UTC
Posts: 9600
Location: seattle/athens
UTC quote
Fast answer - Malossi for max power at the top end, Polini for less top end but good broad power addition. Yes you can add a good exhaust, check out the SIP Road. You'll want at minimum a 20/20 carb or better a 24/24 with proper up jetting* and the bigger filter.


*For technical advice & discussion, you ought to post up over in the Not So Modern section. But first read thru several threads that look relative to your topic and you may find what you need.
OP
UTC

Member
Px125e
Joined: UTC
Posts: 16
Location: Leicester, England
 
Member
Px125e
Joined: UTC
Posts: 16
Location: Leicester, England
UTC quote
Thanks matey!
DoubleGood Design banner

Modern Vespa is the premier site for modern Vespa and Piaggio scooters. Vespa GTS300, GTS250, GTV, GT200, LX150, LXS, ET4, ET2, MP3, Fuoco, Elettrica and more.

Buy Me A Coffee
 

Shop on Amazon with Modern Vespa

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


All Content Copyright 2005-2024 by Modern Vespa.
All Rights Reserved.


[ Time: 0.0135s ][ Queries: 4 (0.0062s) ][ live ][ 313 ][ ThingOne ]