Author Topic: MS250 running hot  (Read 498 times)

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Offline Carpenter Mark

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MS250 running hot
« on: October 28, 2014, 04:59:09 pm »
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  ;))

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Offline brokenbudget

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Re: MS250 running hot
« Reply #1 on: October 28, 2014, 05:05:38 pm »
what does the muffler screen look like?
when was the last time you pulled the covers and cleaned all the crud out?
are you sure the saw is tuned properly? might want to richen it up just a hair.
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Offline 660magnum

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Re: MS250 running hot
« Reply #2 on: October 28, 2014, 05:08:48 pm »
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
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Offline aclarke

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Re: MS250 running hot
« Reply #3 on: October 28, 2014, 11:40:10 pm »
Recommended carb settings are a baseline only and could mean a poor (lean/hot) running saw under certain conditions like metering needle setting or if the saws been tweaked.  Open the high speed and try it again.  Open the high speed too the stops (counterclockwise) and note how it runs.

 

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