Running Downhill

Anything related to Lambrettas... ask tech questions, post helpful info, or just read and learn.
MightyGem
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Tue Jun 08, 2021 10:58 pm

I can recall reading somewhere that you shouldn't run downhill with a closed throttle due to possible seizure because of lack of fuel/lubrication in the cylinder.

Any truth in this?

cgt75b
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Wed Jun 09, 2021 5:45 am

Yep, just keep blipping the throttle 😎

Warkton Tornado No.1
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Wed Jun 09, 2021 11:46 am

Basically, yes.

Insufficient fuel (& oil therefore) will be delivered to an engine run on pre-mix whilst revving quite highly yet not under load/downhill. With the carburettor slide closed, the petroil delivery will be so minimal, the top end will be likely to fail.

If you want to roll downhill, then, for the sake of the engine, declutch, though beware. The practice of 'coasting' may be a tricky area as far as legality is concerned, though I think that the Law used to consider freewheeling whilst deliberately selecting neutral to be dangerous as there is no "Dead_Man's-Brake"

I hope that helps......

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Burnside
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Thu Jun 10, 2021 1:31 pm

Same applies if coming up to a junction after a long blatt as well, clutch in and blip the throttle. Going from loads of fuel to hardly any (fuel cools the cylinder as well) when hot is a recipe for a seize

MightyGem
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Thu Jun 10, 2021 9:14 pm

Excellent stuff. Thanks for that, guys.

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