Using a leak down tester??

[Donnie]

got the kit via this thread http://scooterotica.org/forum/viewtopic ... 12&t=26427

[dennis]

Soapy water, i was only saying, there are people out their that would not think of doing it, have you cured the leak?.

[Muppet]

most didnt know they existed till darrel taylor put them on here

[Donnie]

Soapy water, i was only saying, there are people out their that would not think of doing it, have you cured the leak?.

Lol I wasnt having a go mate. Not cured it yet, been busy posting a few bits this morning and just had lunch so hope to report back this evening

[dennis]

Yep, can honestly say i had not heard of them until on here,but can say it helped me out when i did mine.

[Donnie]

Ive just redone it all, now just giving it an hour to let the threebond settle, then retorque and retest for leaks.

[Donnie]

Feck it, still doing it! Not as bad, ie its not going straight to zero but drops to zero within 10 seconds, leak seems to be from the same place.

Thatll be the base gasket buggered now, so will have to source another like the ones below as standard ones dont fit, anyone know where to get them?

Think im going to replace the stud too and seal it with some studlock or similar just in case.

[ming]

Are you sure the leak tester itself isn't leaking? And 10 psi is a bit much, I usually go to 6 psi which is enough to reveal most leaks but not risk blowing out seals. Also, if you're pressurizing through the intake, the biggest leak will be via the plug hole even with a spark plug cinched down tight as the plug hole will never be a gas tight seal on a cold engine
, so take that into account.

[hendy]

Feck it, still doing it! Not as bad, ie its not going straight to zero but drops to zero within 10 seconds, leak seems to be from the same place.

Thatll be the base gasket buggered now, so will have to source another like the ones below as standard ones dont fit, anyone know where to get them?

Think im going to replace the stud too and seal it with some studlock or similar just in case.

you can buy them from Rich Taylor at gran turismo, or you could use MB base packers which have a much bigger footprint than standard ones so can be trimmed to fit. http://www.lambrettaspares.com/spares/a ... 00m03.html

A lad I know had a similar leak caused by a small crack in the casing allowing it to leak through the lower left hand side stud. He cured it by using studlock as you've suggested. I'm not sure how great a repair that is in the long term but It'd certainly get you going.

[Spanish Fly]

A lad I know had a similar leak caused by a small crack in the casing allowing it to leak through the lower left hand side stud. He cured it by using studlock as you've suggested. I'm not sure how great a repair that is in the long term but It'd certainly get you going.

Sounds likely in this situation. Leak travelling up the stud hole from crack in case thread and escaping at 1st point of exit i.e. porosity/pin hole in barrel casting. Have you checked for hairline crack in stud hole?

SF