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70 Smokes. Need Help!

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Matt

05-08-2003 17:52:23




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I have a 1956 JD 70. It has a rebuilt carb. The problem is that black smoke rolls out of the exhaust when the throttle is pushed from idle to full speed quickly. If throttle is advanced slowly it doesn't smoke near as bad.




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G Taylor........more

05-13-2003 08:52:45




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 Re: 70 Smokes. Need Help! in reply to Matt, 05-08-2003 17:52:23  
Turn the manifold heat on to assist keeping the airfuel mixture vapourized and in suspension.



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G Taylor

05-09-2003 07:58:41




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 Re: 70 Smokes. Need Help! in reply to Matt, 05-08-2003 17:52:23  
While the operators manual calls for a smooth therefore rich idle. Try leaning the idle screws as much as possible as long as she doesn't miss idling or stall on aceleration. Lean is clean combustion. If running too cold, less than 180F and many operators are guilty of it. The idle setting will be too rich to keep it running without choke. Raw fuel will puddle and cling to the intake manifold/port passages. The sudden blast of high velocity/high volume air when the throttle blades go wide open. Dumps all the puddled fuel into the combustion chambers at once, = smoke.

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Clooney

05-09-2003 02:30:08




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 Re: 70 Smokes. Need Help! in reply to Matt, 05-08-2003 17:52:23  
Matt, some smoke when you advance the throttle is normal. Those DLTX carbs have an acceleration system in them that adds fuel when the load is increased from idle.
~If the smoke is excessive or stays with it for a while after throttle up try turning the load screw in a little at a time until the smoke problem gets better. If it starts to hesitate on throttle up back the screw out a little.
~That load screw is in the center of the big nut on the bottom of the carb.
~You might also want to check the ignition timing as late ign timing will also cause smoke.
~One last thing, you could also have a plugged air cleaner inner mesh [common] so try running it with the air cleaner disconnected & see if it gets better, if so pull the air cleaner can & clean & boil it out....

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Lee

05-09-2003 00:31:01




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 Re: 70 Smokes. Need Help! in reply to Matt, 05-08-2003 17:52:23  
Sure sounds as if your hi-speed or 'load' mixture adjustment on that carb is a little rich. Don't know about 70s but on my 43 A I would turn in the right mixture screw a turn and flip the throttle open to test it. You want a little black smoke as going for no smoke at all often means it wants to die and backfire when you hit a real load. Going to too lean on idle mixture screw also will affect load screw setting, so sometimes its a real juggling act between a smooth idle, no smoke on throttle open and actually lugging down and hammering strong on a real load. Not smoking while sneaking the throttle open is normal.

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