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All right, I've got this mower running at about 80% now. There's something still a-miss and I don't know what it could be. So while measuring the coil resistance, I realized the boot (Briggs logo on it) measures 4.7kOhm by itself! Is that normal that the boot has a built-in resistor?

Right, so I don't need a new flywheel, as long as it holds the correct timing after being tightened (which it is, for now). What the hell is this little hole near the exhaust? It looks like the head-bolt threads go right through. Normal?

Just for a laugh I put the bent key back in but rotated 180 degrees (left-to-right), it felt tight in there. Put everything back together and tried running it. It's smoother, but not 100%. Then I undid the nut again to see if it has shifted, surprizingly it's straight as an arrow (photo is after...

That's a pity, it was a free throw-out mower, but it looks nice, nothing else broken, no rust, year 2010. I'm just tinkering with it while there's nothing to do during lockdown 2. I'll try a new key and see if it holds. Maybe move the coils 2-3 mm to the left to compensate? It's a 450 series...

I will get a new key. I was referring to the damage to the key-way (slot) in the flywheel. Maybe it won't matter if I can tighten the nut without it moving, but then you can't see if it did.

OK, I got the flywheel off. But now, is this flywheel key way too far damaged? Maybe make/file a custom key that's slightly oversized. What is your experience?

Perfect, thanks. Now I know this needs fixing to get it running right. I've tried prying while hitting the nut/shaft with a hammer. Tried gentle hitting from underneath. Tried heating it with a heat-gun (paint stripper). Reluctant to really hit it hard, I realize it's aluminium. Next I might...

Hi LawnWorld, The title says it all really. Is this bad enough to cause rough running, e.g. some pops/crackles in the exhaust, hunting idle and sometimes kickback in the starter cord? I've already cleaned the carby and tried 3 different (used) spark plugs, so I guess this is it. The flywheel...