Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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When you try to start it do you hear any kind of noises? Clicks, hums, buzzes? It does sound like the solenoid may be going bad, sometimes it works and others it doesn't. The easy way to check this is with a volt meter and go to the starter post and see if you are getting any voltage to the starter when it is not working. If you are not getting voltage then the solenoid is bad and not pushing voltage to it, if you are getting voltage then the starter may have a bad spot in it creating the problem. My thought however is that the solenoid is bad since it works sometimes and not others and you aren't having to do anything else in order to get it to work.