Carburetors

Dell'Orto SH1/20: Fitted to Lambretta Series III bikes including: Li125 Special, TV175, TV200, SX150, SX200, & GP125. For more info see the Li125 Special carb re-build page.



Dell'Orto SI24/24E: Fitted to 200cc Vespa from the 70s onwards 125 - 200cc including: Rally 200(VSE1T), P200E, & PX200E. Autolube was added to this carb as standard in the US and as an option in Europe.

Dell'Orto SI20/17: Fitted to 150cc Vespas in the 60s including VBA1T and early VBB1T. The choke was not part of the carb, but worked by closing a small air flap in the intake of the carb box.




Dell'Orto TA18C: Fitted to 125cc Vespas in the 50s such as the VM1T, VM2T, VN1T, VN2T.



Dell'Orto SI20/15C: Fitted to 125cc Vespas in the 60s

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VESPA P200e

S p e c s: VSX1T

1977 - 1982
engine: single cylinder, air cooled 2-stroke
induction: disc valve
bore: 66.5 mm
stroke: 57 mm
cubic capacity: 198 cc
compression ratio: 9.8: 1
bhp at rpm: 12 @ 5700
lubrication: 2%(USA autolube)
transmission: 4 speed constant mesh
primary drive: 23/65
1st gear: 13.42: 1 (12/57)
2nd gear: 9.13: 1 (13/42)
3rd gear: 6.32: 1 (17/38)
4th gear: 4.71: 1 (21/35)
clutch: wet - multiplate
carburetor: Dell'Orto SI 24/24 E
(1981 & 1982 sometimes have a SI 20/20 D in a last ditch attempt to meet CA emissions- jet sizes below are for the 24mm carb)
venturi size: 24 mm
main jet: 116/100
slow running jet: 160/100
throttle valve: 8492.4
mixer tube: BE 3
atomiser: 300/100
starter jet: 60/100



ignition: electronic
ignition timing: 23 deg. BTDC
spark plug: NGK - B6ES
spark plug gap: 0.6 mm
voltage: 12 volt





wheels: 10"
wheel hubs: cast w/cooling fins
tires: 3.50 x10
tire pressure (front): 18 psi
tire pressure (rear solo): 26 psi
tire pressure (rear w/passenger): 36 psi
max speed: 65 mph
total dry weight: 238 lbs

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CRANKS

Vespa P200E, PX200E, Rally 200
Stroke: 57mm
Con Rod: 110mm
Vespa PX125, PX150, 150 Super

Stroke: 57mm
Con Rod: 105mm



AF Rayspeed Crank for Lambretta GP200
Stroke: 58mm
Con Rod: 107mm or 116mm
Guaranteed to 12,000 RPM can be used on LI series engines for an Imola Kit or GP 200 series engines for a TS1 kit.

Small Frame Crank - Click for more info
Stroke: 43mm (50cc) & 51mm (others)
Con Rod: 87mm (50cc) & 97mm (others)
This one shown has the separated bearing type on the crank. Older models have a full bearing both sides.



Vespa VBC (150 Super) Crank
Stroke: 57mm
Con Rod: 105mm
Small taper flywheel fits most 60s flywheels but not P series. Click for more detail.

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Seat Locks

Keys are one thing I always find are missing on bikes that have been stored or neglected for a while. This section deals with how to replace a P series seat lock. As far as I know the Vespa P series is the only large frame Vespa that came with a seat lock. Hopefully it will be in the unlocked position on your bike, but if not you will have to drill down the center of the lock with a drill to break the lock.

You'll need the following parts/tools:

A new seat lock
A 7mm socket and driver or a 7mm wrench



There are simply three 7mm bolts holding the lock body into the seat frame. Loosen these with a driver or wrench and the entire lock body will come out of the seat frame. These should all have lock washers on to keep them from loosening with the vibrations of the bike.

Pull the old lock out and refit the new lock in its place. You can use the same 7mm bolts you removed. Once the lock is in place, make sure it works with the seat lock post coming off the top of the gas tank. Try closing it a few times to make sure it is correctly orientated with the seta post. If things are out of line you can loosen the three front seat hinge bolts and slide the seat around for final alignment.

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