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Ser 3 Scootopia Exhaust

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

Ser 3 Scootopia Exhaust

Postby Paulusgnome » Thu Aug 28, 2025 8:50 am

Just bought the above, but it has a horizontal fixing plate that should bolt to underside of the gearbox, but I have nothing to fix it to, do I leave it or cut it off ?
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Re: Ser 3 Scootopia Exhaust

Postby L111amo » Thu Aug 28, 2025 10:52 am

There should be a threaded hole underneath, possibly the bolt has broken off flush
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Re: Ser 3 Scootopia Exhaust

Postby nsaints » Thu Aug 28, 2025 11:15 am

it could also be that the engine is early enough that no hole under the crankcase was drilled/tapped by the factory

my series 3 TV175 never had an exhaust mounting hole

I think you can drill the hole and tap it with the risk of breaking through and creating a handy, but unwanted, auxiliary oil drain hole, or do as I did and chop the bracket off the exhaust
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Re: Ser 3 Scootopia Exhaust

Postby Paulusgnome » Thu Aug 28, 2025 12:06 pm

L111amo wrote:There should be a threaded hole underneath, possibly the bolt has broken off flush




no hole evident, thanks
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Re: Ser 3 Scootopia Exhaust

Postby Paulusgnome » Thu Aug 28, 2025 12:07 pm

nsaints wrote:it could also be that the engine is early enough that no hole under the crankcase was drilled/tapped by the factory

my series 3 TV175 never had an exhaust mounting hole

I think you can drill the hole and tap it with the risk of breaking through and creating a handy, but unwanted, auxiliary oil drain hole, or do as I did and chop the bracket off the exhaust



thanks, i'll cut the bracket off , easier and safer solution .....
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Re: Ser 3 Scootopia Exhaust

Postby Storkfoot » Thu Aug 28, 2025 12:18 pm

Paulusgnome wrote:
nsaints wrote:it could also be that the engine is early enough that no hole under the crankcase was drilled/tapped by the factory

my series 3 TV175 never had an exhaust mounting hole

I think you can drill the hole and tap it with the risk of breaking through and creating a handy, but unwanted, auxiliary oil drain hole, or do as I did and chop the bracket off the exhaust



thanks, i'll cut the bracket off , easier and safer solution .....


I’d just leave it on. It won’t do any harm and would be useful if the exhaust later gets fitted to another casing.
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Re: Ser 3 Scootopia Exhaust

Postby nsaints » Thu Aug 28, 2025 1:21 pm

On the other hand I had a weird vibration with the bracket knocking unfastened against the bottom of the engine..
Off it came ;)
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Re: Ser 3 Scootopia Exhaust

Postby Toddy » Thu Aug 28, 2025 9:49 pm

Storkfoot wrote:
Paulusgnome wrote:
nsaints wrote:it could also be that the engine is early enough that no hole under the crankcase was drilled/tapped by the factory

my series 3 TV175 never had an exhaust mounting hole

I think you can drill the hole and tap it with the risk of breaking through and creating a handy, but unwanted, auxiliary oil drain hole, or do as I did and chop the bracket off the exhaust



thanks, i'll cut the bracket off , easier and safer solution .....


I’d just leave it on. It won’t do any harm and would be useful if the exhaust later gets fitted to another casing.


+1
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