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Discussion Starter · #1 ·
T120
Amal 930's

Will having a gasket instead of INSULATORS cause "Vapour lock"

Friend is convinced his bike dies because of Fuel issues


Just Curious

Thanks
Erle
 

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It probably dies because of fuel isssues, but not because of vapor lock caused by a gasket or insulator. I have seen bikes run with gaskets, no gaskets, insulators, no insulators, gaska-cinch, yamabond, you name it.

Start with the fuel delivery. How fast is the fuel flow from the fuel tap? Is there a blocked gas cap vent? Has the cork or rubber in the tap swollen up and blocked fuel flow?

Try tickling it if it does not want to run when first cranked. if you can keep it going with the tickler the bowl is drying out or the pilot circuit is clogged. Check out the filters, they do get clogged.

It does not have to do with the gasket or insulator, unless they are leaking air, which would make it run lean.
 

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Discussion Starter · #3 ·
It probably dies because of fuel isssues, but not because of vapor lock caused by a gasket or insulator. I have seen bikes run with gaskets, no gaskets, insulators, no insulators, gaska-cinch, yamabond, you name it.

Start with the fuel delivery. How fast is the fuel flow from the fuel tap? Is there a blocked gas cap vent? Has the cork or rubber in the tap swollen up and blocked fuel flow?

Try tickling it if it does not want to run when first cranked. if you can keep it going with the tickler the bowl is drying out or the pilot circuit is clogged. Check out the filters, they do get clogged.

It does not have to do with the gasket or insulator, unless they are leaking air, which would make it run lean.
Thanks man
I'll post more details about the bike when I get home
 

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If you take the float bowl drain plugs out of both carbs and turn on the fuel,you'll normally get a little over 300ml/minute fuel through each carb.You might get by with 1/2 that,if you're lucky.
The 0.100" cross-section Triumph O-ring works well.There will be about 0.045" gap between the flanges to stop heat transfer.If you tighten it much tighter than that,you bend the carb flange.You can still move the carb,when it's "tight".
 

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we use a "soft gasket" that is 3/16" thick and both an heat insulator and a sealing gasket that allows for the removal of the "O" ring and get a cushioned sealing surface for even a non flat carb flange.
but equally important is the correct carb mounting lock nuts and washers.
 

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Friend is convinced his bike dies because of Fuel issues
Can you describe how it's cutting out? Does it sound like it's running out of gas (sputtering out) or like you shut the ignition off (just quits regardless of RPM)? Will it stay running when moving in gear, but quit when in neutral or the clutch pulled in and coasting?
 
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