Sun Nov 21, 2021 3:30 pm

Enthusiast
1980 Vespa 100 Sport
Joined: 20 Feb 2016
Posts: 81
Location: San Francisco
 
Enthusiast
1980 Vespa 100 Sport
Joined: 20 Feb 2016
Posts: 81
Location: San Francisco
Sun Nov 21, 2021 3:30 pm linkquote
Hey all,

At the great recommendation of Barry at SF scooter center I'm replacing my Jetex carb with a phbl kit from Casa Lambretta.

I am noticing the gasket and intake do not match my porting at all. This seems like a problem, no?

I have a 65' Li150 S3.

What should I do??



Sun Nov 21, 2021 5:52 pm

Veni, Vidi, Posti
'15 GTS300, '86 PX125EFL, '66 VBB, '04 Ninja 250
Joined: 04 Apr 2013
Posts: 5375
Location: San Diego, CA
 
Veni, Vidi, Posti
'15 GTS300, '86 PX125EFL, '66 VBB, '04 Ninja 250
Joined: 04 Apr 2013
Posts: 5375
Location: San Diego, CA
Sun Nov 21, 2021 5:52 pm linkquote
Does the gasket match the intake? Looks like you can open the cylinder to match, but be careful, you could land in the stud opening.
Sun Nov 21, 2021 6:18 pm

Hooked
05 Px150, 74 primavera 125, Honda super cub
Joined: 08 Nov 2017
Posts: 153
Location: Ma
 
Hooked
05 Px150, 74 primavera 125, Honda super cub
Joined: 08 Nov 2017
Posts: 153
Location: Ma
Sun Nov 21, 2021 6:18 pm linkquote
I am running a phbl 24mm carb on my Li S3 and I used this intake:
https://www.casalambretta.us/index.php?route=product/product&product_id=1395&search=Phbl++intake+manifold+
Sun Nov 21, 2021 7:10 pm

Ossessionato
LXV 150 3v ie. Midnight Blue (Sold) Now Honda Zoomer X
Joined: 06 Dec 2010
Posts: 3625
Location: Kingdom of Lanna
 
Ossessionato
LXV 150 3v ie. Midnight Blue (Sold) Now Honda Zoomer X
Joined: 06 Dec 2010
Posts: 3625
Location: Kingdom of Lanna
Sun Nov 21, 2021 7:10 pm linkquote
Casa has two manifolds one for S2 and one for S3. I suggest a phone call is in order.
Do you have sticky's book?

For reference https://www.riminilambrettacentre.com/en/catalogsearch/result/?q=inlet
Sun Nov 21, 2021 8:12 pm

Enthusiast
1980 Vespa 100 Sport
Joined: 20 Feb 2016
Posts: 81
Location: San Francisco
 
Enthusiast
1980 Vespa 100 Sport
Joined: 20 Feb 2016
Posts: 81
Location: San Francisco
Sun Nov 21, 2021 8:12 pm linkquote
Here's another shot. The gasket hangs over the port on the left side and doesn't meet it on the right side!

The intake matches the gasket.

Jon at Casa says it's fine but I dunno. Gasket hanging over seems like a problem.



Mon Nov 22, 2021 12:14 am

Ossessionato
LXV 150 3v ie. Midnight Blue (Sold) Now Honda Zoomer X
Joined: 06 Dec 2010
Posts: 3625
Location: Kingdom of Lanna
 
Ossessionato
LXV 150 3v ie. Midnight Blue (Sold) Now Honda Zoomer X
Joined: 06 Dec 2010
Posts: 3625
Location: Kingdom of Lanna
Mon Nov 22, 2021 12:14 am linkquote
What does it look like on the manifold? Edit: Oops Ok it matches.

If you are not using the scoot in competition. Cut out the bit of the gasket that doesn't match the port and then just bolt it all together.

Does Casa tell you what the difference is between their two manifolds.

More help?

http://www.scooterrestorations.com/lambretta/125cc-150cc-inlet-manifold-gasket-2.2mm-thick/

Or repost question here? http://www.ilambretta.co.uk/forum/index.php
Mon Nov 22, 2021 7:52 am

Enthusiast
1980 Vespa 100 Sport
Joined: 20 Feb 2016
Posts: 81
Location: San Francisco
 
Enthusiast
1980 Vespa 100 Sport
Joined: 20 Feb 2016
Posts: 81
Location: San Francisco
Mon Nov 22, 2021 7:52 am linkquote
Casa uses a gasket and manifold for a tv175 because it's likely to match the widest variation in cylinders.

I know it's fine to use an intake that doesn't match perfectly. My concern is using a gasket that doesn't and therefore might not seal.

I can trim the gasket on the side that hangs over the port but on the other side there's only like 3mm of surface contact between the gasket/intake and the cylinder. Is that enough to seal properly? I'd hate to put everything back together and into the bike to just have to pull it again.

If I wanna cut my own I imagine I can use any gasket material from the auto parts store right?
Mon Nov 22, 2021 8:24 am

Banned
2:6
Joined: 11 Jan 2007
Posts: 7975
Location: San Francisco
 
Banned
2:6
Joined: 11 Jan 2007
Posts: 7975
Location: San Francisco
Mon Nov 22, 2021 8:24 am linkquote
3mm is plenty for it to seal

I'd make a new gasket anyhow without the oversized elongated stud holes and trim it to the opening of both the cylinder and the manifold. that way there will not be any unsupported gasket, it will all be trapped between both parts. I'd also use 3bond on it.
Mon Nov 22, 2021 9:24 am

Enthusiast
1980 Vespa 100 Sport
Joined: 20 Feb 2016
Posts: 81
Location: San Francisco
 
Enthusiast
1980 Vespa 100 Sport
Joined: 20 Feb 2016
Posts: 81
Location: San Francisco
Mon Nov 22, 2021 9:24 am linkquote
oopsclunkthud wrote:
3mm is plenty for it to seal

I'd make a new gasket anyhow without the oversized elongated stud holes and trim it to the opening of both the cylinder and the manifold. that way there will not be any unsupported gasket, it will all be trapped between both parts. I'd also use 3bond on it.
Ya it looks like there's no way around making a properly fitting gasket. Any particular kinds of gasket material I should use or is any generic auto parts store stuff workable?

These old scoots are more like mopeds than I thought they'd be
Mon Nov 22, 2021 10:49 am

Banned
2:6
Joined: 11 Jan 2007
Posts: 7975
Location: San Francisco
 
Banned
2:6
Joined: 11 Jan 2007
Posts: 7975
Location: San Francisco
Mon Nov 22, 2021 10:49 am linkquote
any gasket material will do, could even use some paper card stock if needed but something from the autoparts with about the same thickness would be better.
Mon Nov 22, 2021 7:10 pm

Ossessionato
LXV 150 3v ie. Midnight Blue (Sold) Now Honda Zoomer X
Joined: 06 Dec 2010
Posts: 3625
Location: Kingdom of Lanna
 
Ossessionato
LXV 150 3v ie. Midnight Blue (Sold) Now Honda Zoomer X
Joined: 06 Dec 2010
Posts: 3625
Location: Kingdom of Lanna
Mon Nov 22, 2021 7:10 pm linkquote
akpasta wrote:
I can trim the gasket on the side that hangs over the port but on the other side there's only like 3mm of surface contact between the gasket/intake and the cylinder. Is that enough to seal properly?
This is a 200 gasket. A 3mm bit you talk about can be seen. So your 3mm will also be fine.


Wed Nov 24, 2021 2:37 pm

Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
Joined: 21 Oct 2005
Posts: 9685
Location: The state of insanity, SoCal
 
Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
Joined: 21 Oct 2005
Posts: 9685
Location: The state of insanity, SoCal
Wed Nov 24, 2021 2:37 pm linkquote
at that point, I'd make my own. most auto parts stores sell gasket material in 8X11 sheets in a multi pack of different thickness. get down with the arts and crafts and then 3-bond that sucker on there.

if you use RTV I'm coming over and whipping you with a well used inner tube.

good luck!
Wed Nov 24, 2021 4:57 pm

Molto Verboso
2007 Stella 225
Joined: 02 Nov 2019
Posts: 1992
Location: Rochester, Minnesota
 
Molto Verboso
2007 Stella 225
Joined: 02 Nov 2019
Posts: 1992
Location: Rochester, Minnesota
Wed Nov 24, 2021 4:57 pm linkquote
https://www.harborfreight.com/9-piece-hollow-punch-set-3838.html?utm_source=google&utm_medium=cpc&utm_campaign=12169518939&campaignid=12169518939&utm_content=114845717657&adsetid=114845717657&product=3838&store=3250&gclid=EAIaIQobChMIifeul6ey9AIVRymzAB2GswsQEAQYAiABEgI0b_D_BwE

You can get really fancy and get a hole punch set.
greasy125 wrote:
at that point, I'd make my own. most auto parts stores sell gasket material in 8X11 sheets in a multi pack of different thickness. get down with the arts and crafts and then 3-bond that sucker on there.

if you use RTV I'm coming over and whipping you with a well used inner tube.

good luck!
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