steve mower
New User
My '51 8n starts and has good power under load, but stumbles during fast or slow idle. Also runs rough when mowing under light load, like when going downhill. New points, cap, rotor and plugs didn't help. Rebuilt carburator 2 years ago and was running great-this stumbling is a recent development. Weird thing; idles better when idle screw is closed. I have never been able to time it, there are no timing marks visible. I just rotate distributor until I get the best engine sound at high rpm. I've had the carb apart and cleaned all ports and checked float operation. Any ideas?