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It is an OHV V-twin and has two magnetos, so I'm pretty sure each plug sparks every time the magnet on the flywheel goes by. I'll be triggering the tachometer function on my DMM with a coil of wire around the spark plug cable of one of the cylinders, so I'll probably have to select the 4...

Magneto coils came in. Installed and engine running like new, or better. I say "or better" because the air gap was way off originally (about 0.003" instead of 0.010") and it sounds like it is running faster than it was right before replacing the coils. What is the RPM supposed to be with...

Checked the rocker arm clearances. Found all of them at about 0.007", so they were a whisper loose, but my T-40 Torx wrench seems to have grown legs and deferred adjusting until it finds its way back home, or I buy another one. Had both magnetos tested at a local small engine shop. Both were...

Sorry about not getting back sooner, but other stuff keeps popping up. The engine is a 40777-0170G5. The air gap on left magneto was only about 0.003", but adjusting didn't make any difference. Swapping plugs didn't make any difference. Pulling the kill wire didn't make any difference, other...

Thanks for the replies. First I'll try disconnecting the kill wire on the cylinder that dies and then lash the valves later. (They've never been been adjusted since I bought the mower in 2013 - so they definitely might be the problem. That'll get done whether it turns out to be a spark issue...

D140 - DOM 042413 - Briggs & Stratton 40 V-Twin engine - 48" deck. Runs normally for first 1/2 hour, then engine slows down. Runs slow (maybe 80% to 90% of normal RPM with throttle lever staying at same setting) for about 10 minutes or so and then goes back to normal RPM. Then alternates...

The deck clean-out hose port on my deck does seem to be very effective, or at least I don't see much water and/or debris spraying out of the grass chute. After running the blades for a minute, the area on the ground in the exit path of the chute is barely damp, so I was wondering if the hose...