I suspect that if the saw starts overheating the bottom or skirt of the piston would probably start expanding more first and scrubbing on the cylinder wall and with the saw running full throttle in long cuts milling and would do major damage trying to seize at full throttle as compared to making cuts that are not as long at full throttle and coming back to idle for few seconds, like trimming limbs or cutting firewood for example. I've had engines seize up at low rpms and stop running (due to lack of coolant and they cool down with no major damage, but a wide open throttle seize usually results in major damage, like bent or broken rods, etc.
When you start hearing small changes in the saw's rpms in the cut and thinking its the carb erratic it might be the START of the overheating and the piston seizing into the cylinder wall due to increased friction and less rpm's. Just a armchair guess, but a thought to consider.
I agree that leaning the saw will produce more power in the cut removing the 4 cycle rich setting, but you are taking chance of leaning and overheating. I would go for trying to get a adjustment where she is 4 cycling in the cut then point at just below 4 cycling when loaded and sometimes this a only a critical 1/4 to 1/2 turn of the carb H adjustment.
IMHO: I would get a IR temp @ the $17 you mentioned and monitor the temp of the cylinder in the long cut and if no overheat and the scoring gets worse or a new piston scores and the cylinder not overheating you will then be thoroughly confused????? (at least you would know the piston not scoring due to overheating and the saw is running cool)
I was really surprised how fast a saws cylinder temp will start increasing from idle to full throttle in a heavy cut when leaned out and the saw not exceeding the max spec'ed rpm's when monitoring with the IR and slight H jet adjustment and she ran cool.
Good luck to you.
What type of milling setup are you testing. I have some pine logs I've been thinking about milling into 4x4's or 6x6's is why I'm asking?
When you start hearing small changes in the saw's rpms in the cut and thinking its the carb erratic it might be the START of the overheating and the piston seizing into the cylinder wall due to increased friction and less rpm's. Just a armchair guess, but a thought to consider.
I agree that leaning the saw will produce more power in the cut removing the 4 cycle rich setting, but you are taking chance of leaning and overheating. I would go for trying to get a adjustment where she is 4 cycling in the cut then point at just below 4 cycling when loaded and sometimes this a only a critical 1/4 to 1/2 turn of the carb H adjustment.
IMHO: I would get a IR temp @ the $17 you mentioned and monitor the temp of the cylinder in the long cut and if no overheat and the scoring gets worse or a new piston scores and the cylinder not overheating you will then be thoroughly confused????? (at least you would know the piston not scoring due to overheating and the saw is running cool)
I was really surprised how fast a saws cylinder temp will start increasing from idle to full throttle in a heavy cut when leaned out and the saw not exceeding the max spec'ed rpm's when monitoring with the IR and slight H jet adjustment and she ran cool.
Good luck to you.
What type of milling setup are you testing. I have some pine logs I've been thinking about milling into 4x4's or 6x6's is why I'm asking?