I have and electronic ignition. I am replacing the plugs tomorrow, but this has still happened with brand new plugs. I will lean out the mixture as suggested and get back to you. I have also ordered the carburetor rebuild kit, as it is probably due for an overhaul.
I replaced the coil last year (engine was shutting down when hot, and starting up again when cool) but did not replace the plugs. I use RJ12C plugs.
No other issues with rough running, the engine starts up like a dream and I replaced the head gasket about 5 years ago. Compression in the cylinders is good to ok, with worse compression in cylinders 3 & 4, 4 being the worse but if I remember correctly should be around 95 or and the others over 100.
I have the 4 bolt late model carb and will also check for a gap tomorrow.
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