Leak down test spark plug

Anything related to Lambrettas... ask tech questions, post helpful info, or just read and learn.
Mrnice71
registered user
Posts: 111
Joined: Tue Jul 11, 2017 9:41 pm
Main scooter: Lambretta series 3
Contact:

Hi guys ,any good ideas on sealing the spark plug in a leak down test ? got a small leak .Need to address this permanently also
holty
registered user
Posts: 908
Joined: Wed Jul 15, 2015 11:52 pm
Main scooter: lambretta gp
Location: east yorkshire
Contact:

have you tried tightening it a bit more, the aluminium crush washer should seal it unless your head has a defect, maybe try a new plug, could try a little bit of silicone around the washer, but not too much you might seal it in for good,
User avatar
ForemanBob
registered user
Posts: 224
Joined: Thu Sep 17, 2009 7:27 pm
Main scooter: GP RT230
Location: Isle of Naboombu
Contact:

I'd try a new plug an crush the washer down to suit.

Failing that a little grease to try to create a seal...

But if its that bad i'd be looking to get the seat machined flat..
Mrnice71
registered user
Posts: 111
Joined: Tue Jul 11, 2017 9:41 pm
Main scooter: Lambretta series 3
Contact:

Its a brand new head and new spark plug guys , manages to seal it with a fibre washer while l do the test which it passed :)
User avatar
garry inglis
registered user
Posts: 1298
Joined: Tue Jul 21, 2015 8:04 pm
Main scooter: ts1 230 and rb200
Location: darlington
Contact:

when i built my ts1 engine i put the champion plug in that rayspeed recommends and did my leak test all ok apart from that plug changed to ngk and no more leak never used a champion since
Mrnice71
registered user
Posts: 111
Joined: Tue Jul 11, 2017 9:41 pm
Main scooter: Lambretta series 3
Contact:

garry inglis wrote: Sun May 27, 2018 4:18 pm when i built my ts1 engine i put the champion plug in that rayspeed recommends and did my leak test all ok apart from that plug changed to ngk and no more leak never used a champion since
This was a NGK Gary .
User avatar
garry inglis
registered user
Posts: 1298
Joined: Tue Jul 21, 2015 8:04 pm
Main scooter: ts1 230 and rb200
Location: darlington
Contact:

Try a another plug and test and when that's ok test another one and keep as a spare as once engine is in the bike we really don't test them anymore

Sent from my SM-A320FL using Tapatalk

Post Reply Previous topicNext topic
  • Information
  • Who is online

    Users browsing this forum: Ahrefs [Bot] and 13 guests