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I tried putting the brand new coil on upside down with no difference.....the spark plug wire had to be rerouted but reached the plug.....the kill wire had to be jumped to reach. Also tried a good used coil and trigger by themselves and in all combos with the newly purchased OEM ones. I’ve...

Update. We purchased a good used engine (Fc420v-cs00) and installed it to basically get the John Deere mower out the door and back to the customer. With Spring around the corner and the pressure to repair the mower off, the problem with the “old” engine may take a back seat to more pressing...

I didn’t do the valve job but saw the aftermath after re-removing the head. We removed the intake valve entirely, checked the lapping surface and reassembled....nothing of note. The gasket for the intake at the carb is oversized and not brand new but appeared to be sealing. I had to remove...

Definitely backfiring out the carb....tried another carb and another fuel supply (day tank) with same results. Video is a possibility....shop owner is more tech savvy than me. Supposed to be getting another small engine mechanic visiting today for another opinion...we’ll see what he has to...

A local JD dealer suggested that the intake valve seat came out so we took the head off again and rechecked the valve job we had done....no loose seat and both valves looked good. Then we removed the engine and took off the sump, the cam timing marks were aligned but we wondered if possibly the...

Nothing tells me the engine was rebuilt although it’s a customers so who knows. Another mower shop verified the coil and trigger numbers purchased from Deere since that was the original diagnosis. A true puzzler.....the shop owner can’t figure it out and he’s about as sharp as they come. I’m...

Checked the flywheel key on the original flywheel, when the good used flywheel was tried and again when the original flywheel was reinstalled.....all looked fine.....even unplugged the stator since somebody on another forum said they corrected their problem by doing that (although I still don’t...

Oh yeah.....forgot I did leakdown and compression test. Minimal leakage through carb/exhaust/rings and 67 psi with compression release. Good spark but apparently not at the right time although the valve openings/closings look okay. Grrrrr"...

Final remedy? I have the identical problem and have thrown every conceivable part/diagnosis at it with no resolution. Tried new JD coil and trigger, new plug. Swapped good used carb, coil, trigger, flywheel, ignition switch. Valve job and reset valves...many times. Removed engine and sump...