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I have a Murray 17hp b&s 425007x92a This mower runs pretty well great, other than the occasional misfire that occurs, and not being able to run it under 25% throttle, or else it backfires and stalls out. I thought I'd take a look under the valve cover, and honestly, I dont know what to look...

Hello, I finally got my mower up and running, but there's a catch. I need to know if its possible to put the spark plug in too deep? If I put it in, almost all the way, the spark plug gets smacked, and it closes the gap on it. As far as I can tell, this is the correct spark plug for this mower...

It just won't start! I've replaced the starter, solenoid, battery, and now key switch! I can cross it over at the solenoid and it'll start and run just fine. What else can I check? It has never started with the key as long as I've had it and I want to finally fix it, I hate crossing it over like...