I gotta get on my S16 too, it needs a little help. I haven't run that one yet this year. I wound up taking the snowblower off the GT 19 and putting the deck on it. That is the most work the 19 has had to do since I have had it.
Need to put the other deck onto my other GT19 and pull the tiller off, and give it a workout, too.
But really I need to work on the 16 and the NH and soon. I
quit running the 16 last year when it started dieseling badly. When I shut it down it'll keep running and running and running like a diesel and I have a hard time getting it to stop rolling. Sounds weird without the ignition on. I have had the head off within 100 hours (at very most) definitely shouldn't be Carboned up already. I'm hoping it'll be something easy like the points needing adjustment or worn out points pushrod. I did stick a battery in it earlier in the spring and tried to run it, it acted like way over advanced timing as it cranked. Points too close or worn out pushrod would retard the timing.
I didn't try hard or long to see if it would fire.
It ain't the battery cuz I then put that battery into my cub 129, which started right up and has, every week since.