Hi, Bob. I don't know what you've been advised up to now, but I'll relate my issues and fixes I had with my 9N and an 8N.
First the 9N... have owned it 20 years and and when I had starting issues I'd just do a tune up and it'd be good for a few years. More recently it got to the point that wouldn't work and it was running poorly if it did start. I did a complete carb rebuild (on the 8N too while I was at it). Also when putting new points in discovered a short to ground in the dizzy, fixed that and charged the battery up, new plugs also. Started right up and ran good. My battery is an older one and isn't getting enough voltage to start it, runs fine when it starts. I've been jumping with a 12V battery and it fires right up. Want to do a 12V conversion (this is a worker that has to start in all kinds of weather) so not buying another 6V battery.
The 8N, other than the carb, was the same issue, needed a tune up and did put a new 6V battery in it. Also put a new key switch in as I was hot wiring it up to then. Starts pretty well but have to crank on it a bit and giver 'er some choke and she goes.
Best advice is to follow the advice given here, carefully check everything, only takes one little issue to cause a problem on these old girls. It will go once it all works right.
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