Website undergoing maintenance, connection may be intermittent
TSS

Vintage Vespa Forum

80s P125x idles but not much else

AutoShrine Sponsor
AutoShrine Sponsor
AutoShrine Sponsor

jrules J Atencio
Santa Cruz, CA, USA   USA
so i have a 80s p125x. i have rebuilt the pet cock, carb rebuild (new float, float needle, gaskets, etc.), new ignition, ht lead, spark plug cap, and a new spark plug. checked compression running in the 90s, equal to a friends running p125x.

heres the thing. i can get it to start after a lot of kicking and finger crossing. it settles into a slow idle. will idle for a minute + -. will not rev, opening throttle doesn't nothing, just stays at idle. adjusting idle screw on top of carb has no effect. choke doesn't matter.

not sure what my next step is? ignition timing? its got all it needs, fuel, spark, compression, but still no go.

any ideas?

thanks guys,
J

. Hide banner ads & support this website by becoming a > Gold Supporting Member <
OlympiaScooterCompany Avatar
OlympiaScooterCompany Matthew Gatlin
Olympia, WA, USA   USA
When was the last time the seals were replaced? Also which plug are you running?

jrules J Atencio
Santa Cruz, CA, USA   USA
has a fresh ngk b7hs.

i want to say the seals are original. has pretty low hours so i just assumed with the compression test that the seals are good.

would you say thats the next step? Drop engine and replace seals?

thanks,
J

. Hide banner ads & support this website by becoming a > Gold Supporting Member <
OlympiaScooterCompany Avatar
OlympiaScooterCompany Matthew Gatlin
Olympia, WA, USA   USA
Absolutely - I have several P series scooters with the same issues. We have eliminated everything but the seals. If you need any help, let me know. There are also some great tutorials online for replacing the seals if it is your first time.

jrules J Atencio
Santa Cruz, CA, USA   USA
so this is the seal kit ill need seal kit

but is there anything else i should get? if im going to split the cases is there other stuff i should refresh? gasket set?

also do you mind pointing me towards those online tutorials. i have been looking at the vespa maintenance sites engine tear down page. more info will be better for this one.

thanks again for your help. this is great!

OlympiaScooterCompany Avatar
OlympiaScooterCompany Matthew Gatlin
Olympia, WA, USA   USA
Greetings from Olympia Scooter Company,
Prepare to have some fun with rebuilding the motor. When we rebuild a P series motor we usually replace the following since the engine is dropped, and opened up depending on our customers budget.
I would plan on allocating 2 full days towards doing the rebuild. Please keep in mind, if it looks worn, replace it. The picture I included is our workbench with a P200 motor we are working on now.

Remove everything from the motor
Pressure Wash
Soda Blast - wet or dry
154564 Gasket Set
158962 oil seal - Flywheel Side
133068 Bearing - Flywheel side
131102 Seal - Clutch Side
97804 Bearing - Clutch Side
59589 Buffer - Engine side (inspect)
59588 Buffer - Wheel Side (inspect)
DR180 Kit - New Cylinder, Piston, Head
133154 Crankshaft (Inspect)
40316 Damper Buffer (inspect)
113070 Clutch assembly (inspect) - either replace the plates or the entire unit
130536 Oil Seal rear hub
90025 Bearing rear hub
72339 Brake shoes
130939 Shifting Cross (Piaggio)
Inspect all 4 gears
146129 Oil Conveyer Rib
106956 DC Roller Bearing
89299 Starter Gear
97718 Bearing - Spring Gear Assembly
46742 Buffer
All new hardware, nuts, case bolts, cotter pins

Tear Down


Rebuild


Attachments:
unnamed.jpg    64.7 KB
unnamed.jpg

. Hide banner ads & support this website by becoming a > Gold Supporting Member <

To add your reply, or post your own questions




Registration is FREE and takes less than a minute!


Having trouble posting or changing forum settings?
Read the Forum Help (FAQ) or contact the webmaster





Join The Club

Sign in to ask questions, share photos, and access all website features

Your Scooters

1964 Vespa VNB 125

Text Size

Larger Smaller
Reset Save

Sponsor Links