No spark at sparkplug checked switch when blades are dis-engaged whats next ?

Push PTO switch to OFF. Carefully trace the blue wire from PTO clutch to PTO switch. Likely you will find an abrasion of the insulation allowing contact with chassis (battery negative). You can verify PTO blue wire is shorted to chassis with an ohm meter or use an incandescent automotive test lamp referenced to battery positive.

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Check all of your spindles to make sure no bearings are seized..also check all idler pulley bearings....good luck

Check your ground wire. Follow the wire from your engage switch and or button. The ground wire may need tightened. I had a john deere and this problem was intermittent then if finally didn't work at all. I called the dealer and he walked me through the problem. sure enough the ground connection was not only loose but needed cleaning and tightening. Never had the problem again. hope this helps solve your problem.

Check the belt routing. I've had a belt that was a little stretched out grab the pull incorrectly and the force stopped the engine.

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Computers don't have blades to dis-engage. You should re-post in the correct section.

First check for spark at any of the sparkplugs,if you have spark next check fuel pump fuse and relay then check fuel pressure.Turn ignition switch on and listen for pump it should come on for 2 seconds then shut off.

what color is the spark at your sparkplug? If it's red, it's weak,if it's blue it's hot, clean the magneto contacts with sandpaper and wd40 and clean the coil too, let me know how you did!

The common cause of this problem is that one of the safty switches has come dis-connected or has failed since most every newer mower has a electric clutch controlling the mower deck PTO there are safties bilt in under the seat and in other locations to make sure everything is ok before the blades engage, easiest way to test this is to run a jumper from the positive post of the battery to the input wire on the electric clutch assembly making sure all other wires ade dis-connected from the clutch and see if the blades engage if so then usint a continuity tester check all the wires and switches to this item to check for a faulty switch or broken wire. Thanks Don

first check for a blown fuse (owners manual will tell location) next try checking the blade engage switch next check the electric clutch good luck

If the engine runs ok when the blades are not
engaged then the engine is all right. Maybe its a faulty safety blade switch or a wire to the switch is stripped and is earthing to the body. Stephen