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Engine Surging

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Posted August 31, 2012 - 07:12 PM

My 10hp Tech is surging. I have tried to adjust the card with no luck. I put a new kit in the carb when and used the service main jet. This is a new old stock engine so nothing should be worn out yet. The carb shaft is tight. It starts great but just surges. Any suggestions?

#2 Ryan313 ONLINE  


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Posted August 31, 2012 - 07:22 PM

I would think it is the carb. Is there enough use that something could have gotten plugged? Even if it has only a few hours on it I would take it off and clean it. Make sure the lines are clear and everything else also.
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Posted August 31, 2012 - 08:07 PM

This same problem came up a while ago and it turned out to be a low FLOAT level setting that was the cause.
Check the float level and adj if needed.
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#4 johndeereelfman OFFLINE  

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Posted August 31, 2012 - 08:30 PM

Is the spark plug tight? I know, it sounds stupid, but I had the same problem too, and it drove me crazy trying to find it. Turned out the spark plug threads in the aluminum head were stripped, which gave me intermitten spark, and caused the engine to surge.
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#5 cookiemonster OFFLINE  


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Posted August 31, 2012 - 10:04 PM

I vote fuel and carb. A clean or new carb will quickly go to surging if it's getting crud down the lines. Fuel filter is a good idea, too.
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#6 JDBrian OFFLINE  


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Posted September 01, 2012 - 05:14 AM

If the carb issues don't pan out I'd check out the governor A lot of slack in the linkage or a broken spring can cause problems with the governor. It will then exaggerate any tendency for the engine to surge.
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#7 ckjakline OFFLINE  



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Posted September 01, 2012 - 05:34 AM

I had that problem with my dads 10 a couple weeks ago.The spring for the fuel bowl screw is shot and i have to adjust the level every so often until i can get a spring.
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#8 HDWildBill OFFLINE  


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Posted September 01, 2012 - 08:06 PM

Have you checked for air leaks around the manifold? Spray some carb cleaner around the manifold while it is running if the surging stops or smooths out some then you have an air leak. I have a Tech 5hp in the shop now doing the same thing. I couldn't get a new gasket right away so I tried cheating and using the old one.
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