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Sears ss16 Onan engine is hunting at half and full throttle


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#1 ratnestss16 OFFLINE  

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Posted May 27, 2015 - 07:58 AM

My 1972 Sears ss16 is hunting at half and full throttle. I have messed with the governor some , still nothing. She idles fine . If anyone has any suggestions let me know . Thanks.

#2 boyscout862 ONLINE  

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Posted May 27, 2015 - 08:13 AM

Download the manual from our Manuals Section(3 for free per day). Check for a vacuum leak. Tighten carb and manifold bolts. Check govenor springs and linkage for wear. If it is real loose it will not hold steady. Clean plugs. Check ignition wires. Adjust carb mixtures. If it still does it: pull each needle valve(idle and highspeed) and shoot some carb cleaner into their holes. Replace needle valves and try adjusting again. If the problem persits it may be a blocked passage in the carb and the carb will need to be rebuilt. Good Luck, Rick


Edited by boyscout862, May 27, 2015 - 08:14 AM.

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#3 larrybl OFFLINE  

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Posted May 27, 2015 - 08:42 AM

I chased a hunting issue down on a Kohler once. it was due to a worn throttle shaft bushing allowing air passage when the shaft was turned to 1/2 or full throttle. Idle was fine.


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#4 ratnestss16 OFFLINE  

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Posted May 27, 2015 - 09:22 AM

My manifold bolts will not tighten down due to worn threads. This may be the culprit. Thought it might be ok, like it is, but I'm sure there's a a leak. Gonna fix that and go from there. I'll let y'all know. Thanks.
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#5 larrybl OFFLINE  

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Posted May 27, 2015 - 10:43 AM

Look up "helicoil" this should fix your manifold bolts, and if they won't tightned, most likely causing the hunting issue.


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#6 ratnestss16 OFFLINE  

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Posted May 27, 2015 - 11:01 AM

Ok thanks, helicoil is what I was going to try.

#7 TAHOE ONLINE  

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Posted May 27, 2015 - 11:23 AM

your tractor would be a 73 at the earliest, Sears didin't make a SS16 in 72.

 

If the manifold bolts don't fix your issue, those are also bad for the 2 piece intake manifold to separate and suck air. Many guys drill out the rivet area, separate intake, seal with RTV, then use samll bolts/nuts to put it back together.


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#8 ratnestss16 OFFLINE  

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Posted May 27, 2015 - 12:50 PM

I ment 73 model. I'm glad you mentioned that about the intake. I have RTV silicone on it it's probably bad been a while since I pieced it together with the RTV silicone. I'm going to try that also. Thanks
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#9 ratnestss16 OFFLINE  

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Posted May 27, 2015 - 12:52 PM

Carburetor has been cleaned thoroughly the ignition components have also been redone.




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