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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Hi Troy, the link below is a short YouTube video showing the right colour spark and it should spark over the top of the centre electrode... How to check for Spark Plug Fire in any engine If it doesn't spark then check the solinoid.... How to test lawn mower solenoid shows all safety switches disabled.... Disable all lawnmower safety switches
But if it sparks then it's a fuel problem. You need to pull your carby off and unscrew the bottom half from the top, 1st sign of a needle stuck inside the seat is a dry carby There you'll find the float, push the float up and down and see if the needle above the float slides up and down from the seat, If the needle stays up then it's stuck and NOT letting the fuel into the carby, Just pull it down with your fingers to loosen it up..I hope this helps.... CHEERS..
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!
Put switch in 'on' position, remove the spark plug and connect it to the HT lead and earth out the side of the spark plug, pull over the engine to see if you are getting a spark. Check the timing gap between the ignition module and the flywheel. 0.25 filler guage
If you pull off each plug wire and use a test light or plug (one at a time) you should be able to see spark jump. Check all cylinders. This should clear up your suspicions about getting spark or not.
If it is not getting spark, the flywheel may be too rusty for the magneto to pick up a pulse. If you have points, they may be pitted.
I can't tell you which is #1 cylinder, but to set the timing you put #1 to the high point and turn the base plate to close points. The base plate has a set screw to unscrew to move the plate.
Hopefully it will run before that. Good Luck
With your model number I could see if it has a low oil safety switch I have seen them go bad (check your oil level )
With all wires un plugged from the coil you should have spark
if not coil is bad .
Use another spark plug to test for spark, ground the side of the plug by holding it against some-ting metal on the engine , spark
plug wire hooked to the plug. leave a spark plug in the cylinder
head so gas wont fly out and hit the test spark plug catching fire (seen it done).