check compression when hot?
Funny thing, my XLT would start up and run great for about 30 minutes and then it would bog out and die. Limp it back to the garage, let it just sit inside a heated garage for 30 minutes, it would start right up and run fine for about 30 minutes again and then bog out and die. Drove me crazy. Cleaned the carbs about 5-6 times each. Always had good compression. Spark was there. Then the last time I took it out, it ran great for that 30 minutes and then bogged down. I limped it back to the garage and immediately yanked the carbs off. All three carbs had a bowl full of ice.
See, each of the other times, I'd get it back to the garage and let it sit for a while to cool off before working on it. Well, the motor would cool, but the carb bowls would warm up and melt the ice.