The goal of SP Developments is to produce a scooter engine with ancillaries capable of achieving both modern day performance and reliability expectations. This project began with this Lambretta in 2004 with the intention of redesigning the original engine to achieve the goal. In 2014 this led to a 172cc water cooled, fuel and oil injected engine with a 4 speed gearbox which ran in this mule for a number of years producing 24BHP and a top speed of over 80mph which would reliably run at full throttle on a day to day basis. 

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The customer trend throughout this time has resulted in larger capacity engines being desired which resulted in the engine being redeveloped to a 250cc variant which is currently fitted to this scooter for the testing phase.

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The specification of the SP Fuel Injected 250i Development Bike is as follows:

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Engine Specifications
SP engineered (UK) crankcases, mag housing & cover
Liquid cooled cylinder & head with twin radiators/fans
Bore x Stroke 72 x 60mm
Billet Multi wet 7 plate clutch 
SP Crank 116mm con rod (bell shaped)
SP 5 speed gearbox - 9mm gear width
Front Sprocket 14 x 47 clutch drive
V force reeds (RD350 VPVS)
Hand built exhaust LH exit with carbon end can 
SP output shaft multi spline with M18 thread
Rear hub (Casa octopus multi spline 8 drive)
SP Electric starter motor & gearbox

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Electrics
300w generator (3 phase)
SP Fuel injection ECU 
Battery 12V Lithium iron
Unique Wiring harness (hand made)
Motogadget display
Motogadget Indicators
LED lights

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Brakes
Front Brake twin 4 pot calipers & twin discs

Rear Brake (As Standard Lambretta)
Dry break inline connectors 
Billet Master cylinder & switch gear

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Suspension  
SP Front upside down adjustable (bump & rebound)
SP Rear adjustable (bump & rebound) shock absorber 320mm 
SP Billet Stem and triple clamp (5 axis machined)
SP taper stem bearings and housing

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Wheels
SP Billet gold inserts
12” x 3.00 Rims
Tyres (Front) 110 x 70 x 12” (Rear) 110 x 60 x 12”  

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Body Panels
Steel / Fibre glass