PHBH Carb Question

FREE tuning and maintenance info, plus links to our original tuning pages that started it all off.
cartmel808
registered user
Posts: 467
Joined: Tue Feb 04, 2014 10:35 am
Main scooter: 1975 Vespa Rally 200 Femsa
Location: Durham, England
Contact:

What’s the significance of the brass washer (pictured below) on PHBH carbs and Is it essential to the carburettors operation to have it in place??

Image


Sent from my iPhone using Tapatalk
hendy
registered user
Posts: 859
Joined: Mon Jul 07, 2014 10:34 am
Main scooter: lambretta li 125
Location: Tyne and Wear
Contact:

Not essential. I fitted one upside down once and it took me weeks to work out why it wasn't running right. Took it out completely after advice from more knowledgeable bloke. Ran perfect and still does.
cgt75b
registered user
Posts: 603
Joined: Thu Sep 22, 2011 8:05 pm
Main scooter: lambretta
Contact:

It's an anti surge washer and its fitted for a reason.
User avatar
drunkmunkey6969
Moderator
Posts: 2838
Joined: Sun Jan 04, 2009 1:42 pm
Main scooter: '69 Lambretta GP
Location: North Yorkshire
Contact:

Leave it in G... just make sure it's fitted the right way round.
See our YouTube scooter channel for Tech-help: https://www.youtube.com/c/TheScooterFactory/videos
cartmel808
registered user
Posts: 467
Joined: Tue Feb 04, 2014 10:35 am
Main scooter: 1975 Vespa Rally 200 Femsa
Location: Durham, England
Contact:

Cheers lads... will go with the majority & leave it in - just have to remember which way round it went now.


Sent from my iPhone using Tapatalk
hendy
registered user
Posts: 859
Joined: Mon Jul 07, 2014 10:34 am
Main scooter: lambretta li 125
Location: Tyne and Wear
Contact:

The face in your photo goes upwards. Otherwise you get fuel starvation when you rag it; alright when pooling or short term WOT, like as dyno. But if you're WOT FOR a mile or so, it will empty the fuel chamber.
tony172
registered user
Posts: 140
Joined: Sun Jan 13, 2013 10:50 pm
Main scooter: vespa t5
Contact:

I actually don't have one fitted, never had one when I bought the scoot. Never had a problem either. 20bhp malossi 210, used long distance from time to time at a fair old speed. Just my experience
Warkton Tornado No.1
registered user
Posts: 296
Joined: Mon Oct 17, 2011 6:16 pm
Main scooter: Lambretta SX200
Contact:

Just to clarify the fitting of the anti-surge washer. The illustration that is on this site depicts the concave side facing downwards:

https://www.dellorto.co.uk/product-cate ... hbh-parts/

Click:

VIEW DIAGRAM

(Item 48)

I hope that helps, although I'm not a fan of that type of Dell'Orto. Instead of 'anti-surge washers', the designers could have better incorporated 'anti-flood overflows' which they tend to do (particuarly if trying to run a good air filter set-up without drilling a drain hole, which rather defeats the object in filtering the air......) :roll:
Post Reply Previous topicNext topic
  • Information
  • Who is online

    Users browsing this forum: No registered users and 9 guests