Driving me nuts
My 122's original K301 was getting tired and using a fair amount of oil. Planning to pull it for a rebuild, I picked up another to use in the meantime. The original's PTO started slipping last week so I went ahead and swapped engines. The replacement runs well and the PTO works fine, until it is warmed up and under load. It will be running along fine and as the governor kicks in for the load it will stumble, belch black smoke, and then die, pushing black smoke back through the carb as it does so. If I cut the throttle to idle it will stay running and I can throttle it back up. If it does stall it will start back up. I first thought that it might be a carb problem, but after adjusting it and then swapping to the one off the good running original, there is no change. Is this a sign that the cylinder is full of carbon, a valve issue, something else? I'm not sure when I will get a chance to rebuild the original so I'd like to sort this out. Any help would be great. Thanks.
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