PHBH Carb Question

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cartmel808
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Wed Apr 10, 2019 11:10 pm

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??

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hendy
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Wed Apr 10, 2019 11:29 pm

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
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Thu Apr 11, 2019 6:39 am

It's an anti surge washer and its fitted for a reason.

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drunkmunkey6969
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Thu Apr 11, 2019 9:02 am

Leave it in G... just make sure it's fitted the right way round.

cartmel808
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Thu Apr 11, 2019 10:32 am

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


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hendy
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Thu Apr 11, 2019 5:50 pm

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
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Thu Apr 11, 2019 9:24 pm

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
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Fri Apr 12, 2019 11:44 pm

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:

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