I have been using the Husqvarna without safety switches for several years. Just put the plugs in to start then take them out to run the thing. Today the wife was using it and stopped the thing. I tried to start it the usual way which is normally no problem. Today, however the mower wouldnt start as it had been running and thought it was flooded. Not so when I checked the spark plug it was not sparking. No power to the spark plug although the engine is turning over. Where could the problem lie?
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If you have a bad coil, you have no spark at spark plug. Ignition coil(s)/Magnetos generally don't fail, but been known to. General cause for no ignition (spark) is usually caused by bad or misadjusted safety switches and possible connection issues between terminal(s) and switch. To see if you have spark at spark plug, remove the plug from cylinder head and rest the end of the plug where it is close to metal (Ground). Crank engine and see if you have spark. If you have spark, your coil is working. If you don't have spark, verify that the safety switch system is fully functional and adjusted properly before ruling out that the coil/magneto is at fault. Hope this helps.
Make sure spark plug wire is connected and that plug is not blackened and fouled out. Also check your fuel filter (plugged?), the handbar safety lever & it pull cable and make sure it is opening the breather assembly down at the motor or closing the proper switch (unsure of the setup) Those are typically the most common problems. Good Luck
I also have a YTH20K46. During last mow (last week), I tried to turn off mower and would not turn off by key. I had to put it down to choke and then stand up. It created a backfire. Today I went to start it, now won't start. It does not turn over. Hour meter has no power. Tested battery & solenoid. Power to both. Key switch works fine. Any suggestions? Just had it serviced a few months ago. Oil, gas and all other things seem fine. Checked wiring, seems fine. Nothing melted or cut. Please help!
It could be a couple of different things. A couple of things that you can check yourself before having to take it to someone to look at it:
1. Open the hood and try turning the engine by spinning the round "cheese grater" looking part that is attached to the flywheel. - it probably won't turn.
2. Remove the spark plug(s) and try again. (Be careful, if the the cylinder is full of gas/oil it will come out as you spin it by hand.) - DO NOT use the electric start to try and turn it over! This sends spark to the plug wire and could ignite any fuel causing severe burns and/or other serious injuries.
You were unable to spin the engine over by hand without the spark plug(s) in it, then you may be dealing with anything from a wedged starter gear to a seized engine. Fuel with ethanol added to it attacks the rubber/neoprene seals in carburetors and often times allows fuel to fill the crankcase and cylinder. If this has happened the above mentioned plan of action will let you know. As always, anytime the fuel mixes with the engine oil, you should change the oil to prevent the engine from locking up under normal operation.
The starting solinoid would not pull in if the safety switches were failed open. So starter would not turn. Did you replace the spark plug or test on another machine to verify spark? If so, when you replaced the coil were you careful to get the proper spacing from the flywheel. I have heard that you can use a business card to act as a feeler guage to set the coil distance from the flywheel. Too large of a distance will ensure that there is no spark.
I would start by switching plugs. Then does the wet warm one get hot and does the hot one now stay only warm. If the same plug stays wet, replace it.
If the same cylinder is not firing, check the wiring to the plug. Check the coil wiring and coil for spark to that cylinder.
You need to find out if the switches are normally open or closed, that can be done with an ohm meter. Then bypass each one at a time either by just disconnecting the switch or by putting a jumper wire between the contacts (wires off switch). For example the seat kill switch is normally open while operating (no connection) it closes (makes connection) when seat is raised (rider off) and grounds the ignition to shut down the motor. Hope this helps
Hi..my name is Keith..and to answer your question..Yes there is several safety switches that will keep your engine from starting..i would check the seat switch..the neutral safety switch and the blade engaged switch..the clutch/brake switch...if all these check good..then write me back and i will help your further