Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

Hey guys looking for a little help here. 16hp briggs in a national tractor looses spark after warming up. Cools off and then it will restart, Sometimes it acts as if it is throwing spark at the wrong time also as it backfires when trying to resart after it dies (kinda acts like a bad ignition module or something) Not sure how this ignition is set up so looking for  little guidence or if there is something common on this model. Thanks

Also want to add when shutting the key off it doesnt shut off immediatly.. Takes a few seconds then shuts down?

Ok, That engine should have a fuel shut off solenoid that kills the fuel when the key is shut off allowing the rest of the fuel in the jet to clear out and burn so that there is no back firing when shut down. Located on the side of the carb. Now for the spark issue. Remove the coil and clean the mounting surface at the post and on the coil where the screws mount. Engine heat has been known to expand metal right? So a poor connection there can cause it to loose a ground, when it cools down (boom) its grounded again. Also pull the carb apart just to see if any water as entered within the bowl area. Are you forsure losing spark, or is this fuel related. (solenoid) Let me know what you find. And don't forget to clean all battery termanals and engine grounds to frame. Good luck!