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Series 1

Technical help for Series one, two and three Lambrettas. Models include the Li, Li Special, TV, SX, GP, Serveta and API/SIL models
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Series 1

Postby betty2015 » Wed Jul 18, 2018 3:30 pm

Thoughts please
Just built series one engine and found on plug shop that plug was black
Also by error kicked scooter off with out choke
I think main oil seal has blown
Ive checked choke works fine
Any thoughts before i pull it apart
New viton seal
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Re: Series 1

Postby ULC Soulagent » Wed Jul 18, 2018 3:44 pm

What carb and settings would be a good starting point ;)
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Re: Series 1

Postby betty2015 » Wed Jul 18, 2018 4:00 pm

Standard carb 175 top end
106 main jet running through original filter
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Re: Series 1

Postby ULC Soulagent » Wed Jul 18, 2018 5:09 pm

What was the throttle position on the plug chop ?
Was there much white smoke coming from exhaust?
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Re: Series 1

Postby gp200ts1 » Wed Jul 18, 2018 6:13 pm

Does the gearbox oil smell of petrol
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Re: Series 1

Postby betty2015 » Wed Jul 18, 2018 8:26 pm

I would say not that smoky but there is a bit
Oil doesnt smell of petrol
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Re: Series 1

Postby ULC Soulagent » Wed Jul 18, 2018 8:32 pm

Grade of plug?
Wouldn’t think it would be main seal has gone.
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Re: Series 1

Postby betty2015 » Wed Jul 18, 2018 9:02 pm

Never started lambretta with out choke ? Cold
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Re: Series 1

Postby ULC Soulagent » Wed Jul 18, 2018 10:18 pm

betty2015 wrote:Never started lambretta with out choke ? Cold

Miracles never cease too amaze from Lambretta engines :D
Cold !!! What spark plug you using?
And when you say plug was black ! Sooty or oily ?
What actual carb you using?
Sorry for all the questions but every little answer helps us too help you ;)
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Re: Series 1

Postby betty2015 » Wed Jul 18, 2018 10:30 pm

Black oily ang nc3 plug
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Re: Series 1

Postby betty2015 » Wed Jul 18, 2018 10:30 pm

Standard 19mm
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Re: Series 1

Postby ULC Soulagent » Thu Jul 19, 2018 8:00 am

betty2015 wrote:Standard 19mm

Standard main jet for this carb is 95.
Try coming down a few points on it.
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Re: Series 1

Postby ULC Soulagent » Thu Jul 19, 2018 9:32 am

betty2015 wrote:Black oily ang nc3 plug

Change the plug to an champion n5 or NGK B7es for dialling in a fresh rebuilt engine and take it from there
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Re: Series 1

Postby betty2015 » Thu Jul 19, 2018 10:26 am

Thanks
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