Surging on Murray go kart with Tecumseh OHH60

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  #1  
Old 09-29-08, 06:01 AM
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Surging on Murray go kart with Tecumseh OHH60

I am working on a 5 year old Murray with a OHH60 engine.

It would not start, but after cleaning the carb almost all appears fine and it seems to run well under power.

However, the governor seems to be commanding a continuing engine surge, about one vrooom per second at what is supposed to be idle. I can hold my finger on the butterfly and it will seem to idle without dying, but as soon I let it loose the surging starts.

All the springs seem to be right. What is the next step in resolving this? Is the governor stuck or something?
 
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Old 09-29-08, 06:22 AM
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It sounds like the carb. seeds a little adjusing. I'm not familiar with that engine. Can you adjust the high and low speed jets?
 
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Old 09-29-08, 11:31 PM
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Old 10-01-08, 10:07 PM
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Originally Posted by Pilot Dane View Post
It sounds like the carb. seeds a little adjusing. I'm not familiar with that engine. Can you adjust the high and low speed jets?
There appears to me to be no adjustment to the jets - the carb is rather clean.

I also had the book below but it does not seem to address this issue.
 
  #5  
Old 10-02-08, 05:23 AM
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Here's a link to a service manual on Tecumseh engines. It downloads in PDF format - pretty comprehensive. It may have about the same information as the posting by "imliljim".

http://www.cpdonline.com/692509.pdf

Most surging (or hunting), assuming linkages to the governor/carb are tight, comes from a lean mixture. That could be an adjustment, as Pilot points out, or a jet that has a partial blockage. If you can even out the surging with a partial choking of the engine = lean mixture causing the problem.

Check the bottom of the float bowl for a needle adjustment. That would be for the main jet. If adjustments don't work for you, I would think about taking the carb apart and cleaning it.
 
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