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Re: jd 2010 runs only with choke slighty pulled out

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Author  [Modern View]

06-12-2013 21:54:46

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Hmmm. I do know that when I shut the fuel levers on both my model A and my G they pick up rpms when they lean out right before they run out of gas. An engine that needs choke is usually because there's either a vacuum leak or a lack of fuel. If it wasn't for the high idle issue I'd guess that there was a clogged fuel passage in the carb but that intermittent high idle makes me think its a fuel delivery issue. How's the screen in the sediment bowl? When you pull the fuel line and turn on the fuel does it run pretty good? If so it probably is the float setting. I shove a piece of small clear weed eater/chainsaw gas line into the drain cock and run it up alongside the bowl to check the actual fuel level. If that's not it a fuel cap that isn't venting could also be suspect.
This post was edited by clampdaddy at 21:59:56 06/12/13.

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Hugh McKinney

06-13-2013 09:44:11

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 Re: jd 2010 runs only with choke slighty pulled out in reply to clampdaddy, 06-12-2013 21:54:46  
I agree with the vacuum leak scenario: one way that you can diagnose a vacuum leak on a spark ignition engine is to take a propane torch, DON'T LIGHT IT! But take the torch and open the valve and hold it in various locations near the carburetor/intake manifold gaskets while the engine is idling. If a leak is nearby, it will suck the propane into the airstream going into the engine and it should smooth out and no longer require the choke to run smoothly. It's an old trick from mechanics who have long passed on, but it works!

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