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Discussion Starter #1 (Edited)
I can't seem to figure this one out so thought I would ask here.
I rebuilt a K301 and since then I get this random sputter/cough on the idle.
I have tried two different chinese carbs, new plug, points, valve adjust, condenser, sea foam, ignition coil, wiring, spun the carb needles every which way also used a tach, re-torqued head bolts.
I can dial in the high speed needle no problem it is always the low needle and idle that gives me a hassle where you wouldn't even know I rebuilt the engine with it doing the random stutter/cough thing. Sounds like a hit and miss engine but random.
Anything else you guys could suggest for me to check?
On the Chinese carb I see only one tab on the float to bend and set not the other? So I only could set float level one way.
 

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Hemlock Case Guy
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315 Posts
What I have experience with the cheap carbs is the throttle shaft is loose on the throttle linkage plate on the very top of the throttle shaft.

I have to weld them which is tricky.
 

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Discussion Starter #3
How could I test that? Touch it with my finger to see if it acts up? This problem is really driving me crazy because otherwise it sounds like new when running full throttle.
 

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If the throttle plate/arm is loose on the shaft, a temporary thing to try is to put some epoxy on it and run it. The epoxy won't last but should last long enough to tell you if that is the problem or not.
Also smear very thick grease under the throttle plate/arm to help seal the gap from arm to carb body. Again temporary but should tell you if you need a better carb or not.


Danford1
 

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Discussion Starter #5
Didn't seem to be the shaft.
The only other thing I didn't change was the GOV. I re-adjusted it a few times to see and each time it acted a little different for the worse.
How can you tell a bad GOV what are the symptoms? Mine adjust for load on the tractor so I assumed it is working right. Otherwise I have no idea what to do to fix it.
 

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Hemlock Case Guy
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There is the governor setup procedure. But, that is not an adjustment.

Then there is the governor shaft brass bushing. I have changed that on some high hour engines.

The linkage from the governor to the carb is adjustable. The only service manual that I have seen a spec on the length was in the Service manual for a John deere 214.
 
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