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Old 04-23-2012, 05:18 PM
TONYD TONYD is offline
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Default sticking valve
I have a 125 hydro that I mow with. After I mow for a while I get popping/backfire sound. I haven't been putting any Lead additive in my gas. Could this be my problem or should I look deeper?
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Old 04-23-2012, 05:21 PM
TONYD TONYD is offline
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tonyd needs help
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Old 04-23-2012, 05:34 PM
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CADplans CADplans is offline
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It could be a sticking valve, it could be something else!!

For a sticking valve, the best remedy is to ream the valve guide.

A possible bandage fix (temporary) is to add 2 ounces of Marvel Mystery Oil to the engine oil.

The MMO may help for years.

The something else could be an old coil that is giving out, or the points could be out of time.
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Old 04-23-2012, 05:35 PM
R Bedell R Bedell is offline
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I would suggest you trying this........



Mix with your Gas and add to crankcase.
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Old 04-23-2012, 06:15 PM
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Quote:
Originally Posted by R Bedell View Post
I would suggest you trying this........



Mix with your Gas and add to crankcase.

Roland, Great minds think alike!!
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Old 04-23-2012, 06:49 PM
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Sam Mac Sam Mac is online now
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I'd also pull the tins off the engine and make sure it's clean and check your jetting. The older engines were never designed for gas with ethanol and the ethanol makes engines run lean and causes over heating.
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Old 04-23-2012, 09:26 PM
Merk Merk is offline
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Quote:
by Sam Mac
The older engines were never designed for gas with ethanol and the ethanol makes engines run lean and causes over heating.
Check page 1.5 in your Kohler service manual. There is a section that talks about Gasoline/Alcohol blends. Kohler says it is ok to run fuel with 10% ethanol/alcohol in it.

Odds are a valve is sticking.
Without knowing the Cub's past history it is hard to say when any service work such as decarboning the head or oil changes were done. Leaded fuel, fuel with MTBE and fuel over 30 days old can lead to a valve sticking.

Areas I would check:
1. How fresh is the fuel?
2. How old is the spark plug, points and condenser?
3. Plug and Point gap set per Kohler specs?
4. How old is the battery?
5. champion spark plug? I had problems with champion plugs in the past. I've had good results with Autolite spark plugs.

Kohler engines are design to run on unleaded fuel. Leaded fuel will leave deposits on the valves. As stated earlier MMO in your fuel helps to prevent carbon buildup.
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Old 04-23-2012, 10:22 PM
Vince_o Vince_o is offline
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Id listen to Dale, but what do I know?
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Old 04-27-2012, 11:23 AM
orphie orphie is offline
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I have a similair issue with my 1872. It runs fine for 30 minutes and then just quits, no running rough for a few seconds prior to quiting, it just quits. It will not start for another 30-45 minutes, and then will start and run fine for another 20-30 minutes, until we start the process all over again.

This sound like a stuck valve ?
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Old 04-27-2012, 12:59 PM
Mcamp Mcamp is offline
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You should check for spark when it quits, sounds like a coil getting hot.
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