Technical help for Series one, two and three Lambrettas. Models include the Li, Li Special, TV, SX, GP, Serveta and API/SIL models
by Specialcase » Fri Mar 11, 2022 9:40 pm
Ok Gurus
What are the main differences in the series 3 Li150 & the GP 150 engines? I’m looking to use either one of these as a basis for an BGM RT 195 + reed valve kit. Is it worth spending the extra on the GP engine?
TIA
Spl
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Specialcase
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by Rich Oswald » Fri Mar 11, 2022 10:55 pm
LI has the far better gearbox but you will need to change to GP crank taper.
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Rich Oswald
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by MickYork » Sat Mar 12, 2022 8:12 am
The GP side casing/clutch is generally preferred.
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by hullygully » Tue Mar 15, 2022 11:26 am
both of above, plus gear selector arm & rear brake assy
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by bookertmgs1 » Tue Mar 15, 2022 1:36 pm
I'd go with the Li150 - just because of the gearbox.
If you are putting a RT kit on it - you'd be thinking of replacing crank at same time anyway.
Sidecasing on S1 & S2 can be weak around kickstart shaft - but it wouldn't put me off - could always replace with a GP or S3 together with kickstart lever change
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