Importance of Leak Testing

General scooter chat, any scooter related non technical info.
nellyboyo
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Joined: Wed Sep 22, 2010 10:28 am
Main scooter: Lambretta
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Mon Mar 25, 2019 8:18 pm

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Leak tested my new top end set up today and found a leak straight through the casting of this manifold. From the inside you theres nothing that can be seen by the naked eye ....But it does look dodgy form the outside...Would never have suspected a leak there .....Tidy

nellyboyo
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Joined: Wed Sep 22, 2010 10:28 am
Main scooter: Lambretta
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Mon Mar 25, 2019 8:19 pm

Too many !yous! in there ...ha

paul d
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Main scooter: T5 172 Tv 240
Location: Galway Ireland
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Tue Mar 26, 2019 12:18 am

I'd never build without a leakdown test now. Maybe it's the most important thing I've learnt in the last 5 years.

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corrado
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Joined: Thu Jan 08, 2009 1:12 am
Main scooter: Lambretta GP
Location: Top of Blackpool Tower
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Wed Apr 03, 2019 10:53 pm

Doing my first one since buying a kit tomorrow, I'm dreading it. :mrgreen:

YAMLAM
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Thu Apr 04, 2019 12:21 am

wouldn`t dream of not doing it now, but how many engines have we built since the early 80`s (in my case) where we didnt ( never heard of it ) . And id never heard of "Squish" until i bought a cast iron 5 port reed valve kit from taffspeed in the 90`s.
win or lose have a booze

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Fux
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Main scooter: li150 S2
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Mon Apr 15, 2019 12:16 pm

The last 6 engines I have built all had leaks.

Maghouse, exhaust manifold through a weld, base gasket and head.

Its easy to say it worked out fine before we started testing them but I reccon 90% of the problems I had in the past like holed pistons and kits that were realy hard to jet were air leak issues.

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