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Need help with Duplex carb on a 60

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AlbertoV05

01-16-2003 19:24:51




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I've got a miss on #2 cylinder that I can't seem to adjust out with the idle adjusting screw. Tried shorting out #1 and adjusting #2 idle, then repeating process for #1 cylinder (as per service manual) but still there. I have not yet "fiddled with" metering screw.
Top end of motor was completely rebuilt about 500 hours ago. I have installed new points, condensor, plugs (AC C88L's), plug and coil wires and coil.
I'm not a carb specialist by any means so any tips would be appreciated.
Thanks in advance

Al in Iowa

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Clooney

01-17-2003 03:37:08




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 Re: Need help with Duplex carb on a 60 in reply to AlbertoV05, 01-16-2003 19:24:51  
Al, if your problem is at idle it isn't the metering screw.
~Does the idle adjusting screw for the #2 cylinder have any effect on the idle quality? If not, or it has less effect than the carb L/H idle screw, the carb idle circuit is probably the problem.
~If you can change the idle, but just can�t get it right, more than likely you have other problems like worn carb throttle plate, worn throttle shaft bushings/or shaft, low compression, leaking valve guide, faulty spark plug, worn distributor points cam, manifold problem or other reason it won�t fire the R/H cylinder consistently at idle.
~Start with a new set of spark plugs set at .040� or at least swap the old ones side to side to see if that helps. Then maybe try a new plug wire on the offending side. If no help there do a hot compression test, valve adjustment & check the valve guides for excess play.
~Look the carb over for worn throttle plates, loose throttle shaft bushings & a worn throttle shaft, or a bent throttle shaft. [if the carb has different sealing or worn throttle plates it will never idle correctly]. You might want to pull the carb & hold it up to a light source to see if the ring of light around the throttle plates looks the same on both sides [if not start there].
~One other thing to check is that the manifold heat control valve is set to EXACTLY hot or cold & not turned a little. [if it is not exactly on hot or cold it could let exhaust gas into the intake manifold causing poor running & a lousy idle]

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AlbertoV05

01-18-2003 19:58:53




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 Re: Re: Need help with Duplex carb on a 60 in reply to Clooney, 01-17-2003 03:37:08  
Thanks for your help (again), Clooney!
I had the JD tech come out on Friday and he found that my points were set to nearly .030; after re-gapping to .022 she purrs like a kitten!
I noticed that you suggested I gap the plugs to .040; my manual says to gap to .030. Will going to a larger gap boost performance/longevity of the C88-L's I run?
Thanks again!

Al in Iowa



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Clooney

01-19-2003 07:15:26




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 Re: Re: Re: Need help with Duplex carb on a 60 in reply to AlbertoV05, 01-18-2003 19:58:53  
Al, no, going to a larger plug gap won't boost performance. In a lot of cases it will improve the idle quality though. If you are happy with the idle using .030" gap then there is no reason to try .040"..



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ChuckW

01-16-2003 20:40:25




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 Re: Need help with Duplex carb on a 60 in reply to AlbertoV05, 01-16-2003 19:24:51  
Al, sounds like you definitely need a carb rebuild. Your idle passages are stopped up, reason for miss no fuel a low speed. It is not simple to rebuild the duplex as they used steel balls to seal the drill passages. If you want to pay for a good job, I'd recommend sending it to Robert's carburators in Spencer.



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