2 Cycle Starting Problem


Old 10-13-02, 05:57 PM
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Question Sear 25cc 2 cycle Gas Blower won't start

The Sears 25cc 2 cycle gas blower is more than a year old. It worked fine last season. Starting this spring, it would not start. I have replaced the spark plug. I have opened up the side where air intake filter is and sprayed inside the choke with carbureter cleaner. Still it did not start. I have tried to make some adjustment on the two screws by turning clockwise and counter-clockwise, however it did not help. I went back to the original position.
I have read one of the reply to clean up the fuel tank filter and the carb. The same would aplly or do I need to do something different.

Please let me know.


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Old 10-13-02, 07:22 PM
J A Boggan
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The first thing I would check for, is a good heathly blue spark. Also, does the engine hit at all, or will it do nothing. It could be possible that yor kill switch is bad or there may be some sort of "short" in the wireing.

'Always" consider safety when checking the spark.
Old 10-13-02, 07:38 PM
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Hello ishwardave. Welcome to our Small Engine forum.

Although you have performed some of the checks, several possibilities need to be determined, checked and rechecked.

Check for fuel flow out of the fuel tank even though you cleaned it. Check for ignition spark. The carb cleaning did not totally cleanout the fuel passages nor would it simply by spraying onto the carb venturi barrel.

When an engine simply fails to start, the cause is most likely no spark at the spark plug. There could be any number of reasons why there would be no spark.

Most likely the spark plug is defective or fouled. The easiest fix is to replace the plug with a new one and retry starting the engine.

If changing the plug fails to provide any spark and the engine still won't start, check for a grounded on/off switch or lever. Usually these parts are located on the engine and operated by the throttle speed control lever secured on the handle.

If there is spark to the plug, there may not be any fuel getting into the carb or the carb is gummed up. If this happens to be the case, remove the spark plug, add a few drops of fuel into the spark plug hole and reinstall the spark plug. Attempt to start the engine.

If the engine starts briefly and dies, the carb is gummed up or it's not getting fuel. Check the fuel lines, fuel filter and fuel flow rate by removing the fuel hose at the carb.

Allow some fuel to flow out into a container. The fuel should flow out of the hose freely. If not, check for a fuel restriction in the fuel supply system.

If fuel does flow out freely and continuously, the carb is most likely filled with stale fuel which has gummed up the fuel ports. In this case the entire carb must be removed, cleaned out and reassembled with a new carb rebuilding kit.

The rest of the information pertaining to your topic is contained within other postings on this same subject. Read the other postings and replies offered for additional help & information on this subject of 2 cycle engine starting problems.

Most likely this is not all of the potential problems. The other resident small engine service and repair professionals and moderators, may offer additional suggestions, advice & help.

Check back several times for additional replies.

Read the manufacturers web site for problem possibilities, causes and solving methods, part locations, disassembly, reassembly methods, repair procedures and instructions, pictorials and schematics, which may be available online.

If you need further assistance, use the REPLY button to add any additional information or ask another question on this topic, etc. Using the above method also moves the topic back up to the top of the list automatically.

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Old 10-13-02, 10:39 PM
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If you got a good spark and you can smell fuel in the cylinder you have a messed up carb. Buy a carb kit and take apart the carb. Clean it with solvent and blow it dry with compressed air.

They have such small carbs that any dirt will mess them up.
Old 10-28-02, 06:21 PM
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another possibility

If this machine was heavily used then you need to check the exhaust screen as well. This screen is located within the muffler (you will note the muffler is really 2 piece). If the screen is completely choked you can either "chunk it", clean it or find a replacement. Be sure to rule out fuel delivery first and if you suspect feul delivery, replace the tank filter and rebuild the carb. Both of these are easily done and parts should not exceed $10.
Good Luck

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