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Yamaha RD 350 YPVS into a Lambretta (SIL) GP

Technical help for Series one, two and three Lambrettas. Models include the Li, Li Special, TV, SX, GP, Serveta and API/SIL models

Yamaha RD 350 YPVS into a Lambretta (SIL) GP

Postby LambrettaMarky » Tue Mar 10, 2026 10:13 am

Folks.

As the title suggests, I have a spare Yamaha RD 350 YPVS motor that came with a 1988 F2 that I'm renovating. I've always had a thing for RDs since my first RD350LC back in the mid 80's & I'm aware it's feasible to fit the motor into a Lambretta.

Can anyone suggest a resident expert that may be able to offer advice &/or any publications, pictures etc (anything really!) that may be able to persuade me this is either a good or daft idea?

Cheers

Lambretta Marky
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Re: Yamaha RD 350 YPVS into a Lambretta (SIL) GP

Postby nsaints » Tue Mar 10, 2026 6:36 pm

Its certainly been done before late 80’s/early 90’s

If you search Alan Rosser YPVS Lambretta the search throws up some pictures and articles

Other watching a demo of someone riding one at a rally back in the day thats the sum total of my knowledge.
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Re: Yamaha RD 350 YPVS into a Lambretta (SIL) GP

Postby LambrettaMarky » Wed Mar 11, 2026 9:51 am

nsaints wrote:Its certainly been done before late 80’s/early 90’s

If you search Alan Rosser YPVS Lambretta the search throws up some pictures and articles

Other watching a demo of someone riding one at a rally back in the day thats the sum total of my knowledge.



Thanks & I'll take a look.
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Re: Yamaha RD 350 YPVS into a Lambretta (SIL) GP

Postby gaz_powell » Wed Mar 11, 2026 11:05 pm

There's been plenty better jobs done since the original Rossa though credit it was his idea....or was it Frank Ssnderson ???

The Rossa was plagued with issues that a few people bettered in time based on the concept but at huge cost and I'm sure some head and heart ache.

There was a very good example done by a lad who came on here, it was finished a metal flake AF/DTC style paint. He knew what he was about and a very clever lad.....Holty, I think ???

Give him message ?

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Re: Yamaha RD 350 YPVS into a Lambretta (SIL) GP

Postby LambrettaMarky » Thu Mar 12, 2026 10:23 am

gaz_powell wrote:There's been plenty better jobs done since the original Rossa though credit it was his idea....or was it Frank Ssnderson ???

The Rossa was plagued with issues that a few people bettered in time based on the concept but at huge cost and I'm sure some head and heart ache.

There was a very good example done by a lad who came on here, it was finished a metal flake AF/DTC style paint. He knew what he was about and a very clever lad.....Holty, I think ???

Give him message ?

gaz



Thanks Gaz.
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Re: Yamaha RD 350 YPVS into a Lambretta (SIL) GP

Postby LambrettaMarky » Thu Mar 12, 2026 10:24 am

Holty looks like he's not been on here since 2020..
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Re: Yamaha RD 350 YPVS into a Lambretta (SIL) GP

Postby martyn dwane » Thu Mar 12, 2026 12:13 pm

Stephen Holt, he`s on Face book.
think he `s into sprinting.
Makes some great engines
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Re: Yamaha RD 350 YPVS into a Lambretta (SIL) GP

Postby LambrettaMarky » Thu Mar 12, 2026 3:52 pm

martyn dwane wrote:Stephen Holt, he`s on Face book.
think he `s into sprinting.
Makes some great engines


Thank you.
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