Chainsaw Repair

I have a MS250 w/18" bar that gets really hot after 10-15 mins of cutting. You can smell the heat and when it does get hot it has to be completely cold before it will start again. I run premium gas with Stihl 50:1 oil but don't use additives. I've re-set the carb to recommended settings but it still gets hot.  Yesterday I felled a 20" ash but was only able to cut up the first 15 feet before the saw got too hot and I had to shut it off. Is this typical? (yes the chain was sharp, saw didn't bog too much  )

I have three of these saws and you can run them all day without over heating.

You need to remove the starter and examine for debris around the fins of the flywheel and cylinder?

You also need to run them to where at wide open throttle, they four stoke out of the cut.

Also 50:1 gas oil ratios are a emissions compromise and not necessarily good for the engine. 40:1 would be better for the engine. I run 32:1