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Need carburation advice double SUs SH6

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Old Jan 8th, 2019, 21:45   #21
adarvasi
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Thank you [QUOTE=blueosprey90;2482669]Sounds like your carb float chamber was overflowing.QUOTE]
Did not understand this, it was overflowing!
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Old Jan 8th, 2019, 21:48   #22
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Thank you
Quote:
Originally Posted by blueosprey90 View Post
Sounds like your carb float chamber was overflowing.
I was overflowing!
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Old Jan 8th, 2019, 21:50   #23
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Quote:
Originally Posted by arcturus View Post
Can you remind us which carbs exactly are fitted. found it H6
I have HS6s, and found a repair kit in the US for a reasonable price https://mossmotors.com/catalogsearch...cat=&q=375-578
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Old Jan 8th, 2019, 21:57   #24
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Quote:
Originally Posted by Ron Kwas View Post
adarvasi;
...it sounds your front carb may have a Bowl Lid with one of these vent fittings, and rear carb clearly has an older Bowl Lid fitted, with simple atmospheric venting...all should become clear once you disassemble and inspect (and I wonder where the Bowl Vent of from carb is routed too...?...please report what you find!...maybe just a picture showing the top of both Fuel Bowls...).

Good Hunting!
Thank Ron,
Have been reading all the info suggested by you and the other members, and don't really know what the problem is.
There is no vent hole in front carb!
I will take both carbs apart and install the repair kits, tune per instructions, and see how it turns out. Should have everything here hopefully by Friday next.
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File Type: jpg Front carb detail1.JPG (81.0 KB, 23 views)
File Type: jpg Rear carb vent detail.JPG (99.4 KB, 18 views)
File Type: jpg Carbs view from above.JPG (93.1 KB, 19 views)

Last edited by adarvasi; Jan 8th, 2019 at 22:01.
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Old Jan 9th, 2019, 01:34   #25
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adarvasi;

...the cover for atmospheric venting can clearly be seen under the fuel hose of the left picture...
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Old Jan 9th, 2019, 01:39   #26
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Absolutely right, I was looking for a similar orifice as the rear one!
Thank you Ron
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Old Jan 9th, 2019, 10:09   #27
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Do you mean this?
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Old Jan 9th, 2019, 16:58   #28
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I think Ron will say yes.

See this link, first 3 or 4 pictures. They may help you visualize the situation.

https://sites.google.com/site/fifers...wPrintDialog=1


In addition to everything else that has been mentioned about what might cause the carburetor to overflow, It also may be possible for the fuel pump to have too much pressure. The SU carbs only require about 3 psi of fuel line pressure. If you have an aftermarket fuel pump it might be rated at too high a pressure.

My money (of course, I never bet more than $1) is riding on a leaking float as your cause of overflow. Initially you did not seem to have this overflow problem. My guess is that it took a few days of gasoline sitting in the float chamber for the float to slowly fill with fuel and sink to the bottom - or at least to the point where the float wouldn't rise high enough to shut the needle valve.
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Old Jan 9th, 2019, 18:22   #29
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adarvasi; The only time you can see the venthole below fuel inlet is if the little cover has been removed... so the one you saw was actually not the typical situation...

bo90; Thanks for link with additional info!

Cheers
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Old Jan 9th, 2019, 19:09   #30
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The short flex pipe from the bowl to the jet can also leak at the gland where the pipe exits the bowl
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