I must be in the twilight zone. Never have I heard of, performed, or seen anyone do a compression test on a warm engine, ever. Probably because it's the wrong way to do it, but I guess this IS the internet, so...
Anyway, my bike is ridden every weekday. Don't know where the weekend came from, as the original post says weekday.
I will adjust the valves and perform another cold compression test, as performing one warm would be useless.
When an engine is warmed up, unless it has just one cylinder, the compressions will vary in cylinders due to uneven heating, physical material distribution, etc. Especially in a carbureted engine. Especially in a 40 year old carbureted engine.
When cold, all the metal shrinks down allowing for a more accurate test of what's really going on with compression. This is why many (not all) engines require the engine to be cold to adjust the valves. This is also why we do leakdown tests on a cold engine.
I have never, EVER heard of anyone in the car business doing compression tests on warm engines because it just isn't done that way. Sorry.
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