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No spark 1996 McClaine lawnmower 5 hp GXV140 Honda engine has no spark , changed plug and checked oil lvl. I have no manual

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  • dderwin May 27, 2009

    I solved this. Pull the pull starter off top. 3 -10 mm nuts hold it on this one. Remove the gas tank. Good time to check the fuel line for any cracks or brittleness. This exposed the entire engine to work on. My flywheel was clean , no rust, and magnets felt strong. There were 2 wires coming from the magnito ( coil) I disconnected the small wire, this went to the dead man switch. Still had no spark. The other large wire goes to the spark plug. I removed spark plug and attached a wire with 2 large aligator clips to the plug threads and then to the engine cooling fin to ground the spark plug. I reattached the pull starter so I could turn the engine over fast. Still no spark. I removed the magnito (coil) . There were 3 small surfaces to the magnito , shaped like a horse shoe around a small box, that actually are set about .010 away from the flywheel. All 3 were completely covered with thick heavy rust. There was no rust on the flywheel. I used 100 grit sandpaper to remove the rust and hooked the magnito back on setting it with a soft matchbook cover. The matchbook cover was about .012. I figured close enough for now. I hooked the spark plug back onto the sparkplug wire and pulled the starter rope to see a bright blue spark jump the .030 sparkplug gap numerous times. I couldn't see this rust blocking the connection between magnito and flywheel until after I had removed the magnito. Hope this helps someone else.



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Try sanding ends of magnito and check the wire from magnito to sparkplug and see if its broke.

Posted on Sep 18, 2010


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