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Float bowl leaking #244909
03/25/09 2:04 pm
03/25/09 2:04 pm
Joined: Aug 2001
Posts: 63
Central Ohio
Steve in Ohio Offline OP
BritBike Forum member
Steve in Ohio  Offline OP
BritBike Forum member
Joined: Aug 2001
Posts: 63
Central Ohio
I was trying to cure one thing (chirping in the exhaust) when another gremlin came up and bit me. I cleaned my carbs and checked the float level (2mm below rim of bowl) when I put it back together and tried to tickle gas weeped out from between the float bowl and carb body. Did some checking (bushman's article on AMAL carb) it said float level is too high. Went back and checked the float level again. Still appears right on or a little low, but ok. Then I checked the bowls on flat surface and found them warped. Lapped the bowls reassembled and still had the leak. The only thing I haven't done is new gaskets. These are 2 year old amals on my A65. Any suggestions?
Thanks,
Steve in Ohio



'68 A65 Bitsa
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Re: Float bowl leaking [Re: Steve in Ohio] #244958
03/25/09 7:01 pm
03/25/09 7:01 pm
Joined: Sep 2002
Posts: 7,812
Seattle
Alex Offline

BritBike Forum member
Alex  Offline

BritBike Forum member
Joined: Sep 2002
Posts: 7,812
Seattle
Steve, is this leakage happening on the side or centerstand? When the carbs are level (ie bike on centerstand), the float bowl gasket should not have to do anything unless the float needles are leaking or the floats are sticking. First, make sure there's no interference between the gasket and the float. Second, are you using plastic or the improved viton float needles? Finally, even if you get the top of the float bowl flat, the mating surface on the bottom of the body is probably warped. Get a nice single-cut file and dress this area to make it flat...though, again, with the bike sitting level and off, it should not leak from here.


A smattering:
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Re: Float bowl leaking [Re: Alex] #244967
03/25/09 8:39 pm
03/25/09 8:39 pm
Joined: Aug 2001
Posts: 63
Central Ohio
Steve in Ohio Offline OP
BritBike Forum member
Steve in Ohio  Offline OP
BritBike Forum member
Joined: Aug 2001
Posts: 63
Central Ohio
Well this was all happening on the centerstand. I retraced my steps readjusted the float level cleaned up the mating surfaces and put it all together again. This time when I tickled it there was not leaking and it started right up on the second kick. Thanks for the second set of eyes Alex.
Steve in Ohio



'68 A65 Bitsa
Re: Float bowl leaking [Re: Steve in Ohio] #244975
03/25/09 9:33 pm
03/25/09 9:33 pm
Joined: Mar 2005
Posts: 10,052
Boston, Massachusetts
J
John Healy Online content
BritBike Forum member
John Healy  Online Content
BritBike Forum member
J
Joined: Mar 2005
Posts: 10,052
Boston, Massachusetts
The warped bowl will also allow air to be drawn through the pilot (idle) fuel circuit causing the bike not to run well at idle or just above.

Because of the air leak, the pilot circuit will not be able to draw any fuel out of the float bowl. It is important that this gasket seal not just to prevent a fuel leak, but to allow manifold vacuum to be able to draw fuel from the bowl for the pilot (idle) circuit. Important stuff!!
John


Re: Float bowl leaking [Re: John Healy] #244981
03/25/09 11:12 pm
03/25/09 11:12 pm
Joined: Aug 2001
Posts: 63
Central Ohio
Steve in Ohio Offline OP
BritBike Forum member
Steve in Ohio  Offline OP
BritBike Forum member
Joined: Aug 2001
Posts: 63
Central Ohio
This whole episode started with poor idle and some other issues. I had thought there may be an air leak, but did not have the presence of mind to think that I had issues with the float bowl and its effect on the pilot jet.
Steve in Ohio



'68 A65 Bitsa

Moderated by  Alan_nc 


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