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#61551 06/23/08 6:27 pm
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After 2 winters restoring my BSA, I,m trying to get her running but the bike only runs with the choke completely on. When I open up the choke she falls flat on her face. Whats up?? Air Leak??

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Old gas?


Jer

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Are you sure it's totally on, instead of totally off? I don't know how many times I've done that or I've known others to do that. When the cable is pulled (under tension), the choke is off.

Otherwise: Are the balance pipes connected?


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Fresh new 93 octane go juice.

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Alex, I have the air breathers off so I can see the choke slide. I know what you mean about the confusion. When you say balance pipes, is that the hose between the two carbs? Thanks

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Well, the hose between the two inlet ports on the head itself. You can check for air leaks by waving a propane torch (unlit) around the carbs and inlets. If RPMs change solely on the basis of where the propane is, you've got an air leak.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
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Posts: 13
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Alex, Thanks for that info. That balance pipe is the original part and it has lost some of its flexibility. I'll check for that air leak. Regarding the choke lever being open/closed,I'm guessing when I see the choke slide covering the intake opening then the choke is in the closed position??

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Yes. If you look down the throat of the carb with the throttle all the way open, all you should see in the bore is the needle.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
Joined: Mar 2007
Posts: 13
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I checked for air leaks around the balance tube and the carb mounting flange and found nothing. It still stalls out when I open up the choke. What should the idle rpm be? I'm scratching my head now on what to look for now.


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