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Author Topic: Stihl MS270 dies when hot  (Read 786 times)

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Offline 4lane

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Stihl MS270 dies when hot
« on: May 30, 2018, 02:38:29 PM »
I have a MS270 that starts and runs great until, it seems, it starts to get hot. After about 10mins of sawing it will stall out unless you grab the throttle quick. If it dies, it won't start until after a few minutes again, but then it will die again.

I rebuilt the carb, new fuel filter, fuel hose, spark plug. These were all the cheap fixes, but it still has the same problem. I'm thinking coil. Any thoughts?

Offline Upstatewoodchuc

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Re: Stihl MS270 dies when hot
« Reply #1 on: May 30, 2018, 03:02:22 PM »
Check compression. My stihl ms310 did exactly that until I realized it had 97psi of compression.....
Current collection: Husky 3120xp,  394xp, 365, 345, stihl 017, homelite xl12.  Ford 8n with loader and forks. 1968 Chevy C50 dump truck

Offline 4lane

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Re: Stihl MS270 dies when hot
« Reply #2 on: May 30, 2018, 03:12:20 PM »
When the compression was down, was that only when it wasn't running? Or did you check when it was running fine?

Mine runs like a boss when it's running - no hints of low compression when it's running.

Offline Upstatewoodchuc

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Re: Stihl MS270 dies when hot
« Reply #3 on: May 30, 2018, 05:50:15 PM »
It was low overall, but once hot after a couple minutes of cutting and you checked it once it stopped running, that's when I got the 97psi. If you check it cold and you have anywhere from 120-150, it's probably fine, but if you can get it running long enough it's more accurate to check hot.
Current collection: Husky 3120xp,  394xp, 365, 345, stihl 017, homelite xl12.  Ford 8n with loader and forks. 1968 Chevy C50 dump truck

Offline Vladislav500

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Re: Stihl MS270 dies when hot
« Reply #4 on: June 01, 2018, 02:50:24 AM »
Hi! Check spark on the cold saw and then on the hot one when dies and compare.
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Offline joe_indi

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Re: Stihl MS270 dies when hot
« Reply #5 on: June 04, 2018, 09:39:29 PM »
This usually happens when there is a fuel supply issue. Too much or too little
Try with a fresh pickup body after cleaning out the strainer in the carb. That should take care of the too little.
Check whether the metering level in the carb is too high.
It could also happen if you have accumulated saw dust on top of the metering diaphragm.
A wrongly adjusted L and Idle (LA)  screws could also cause it. Idle screw  turned in too much and L screw used to reduce the fast idle.
Move L screw to standard setting and adjust Idle screw to get a normal idle with hand off the throttle. Once the engine is warm, turn in L screw enough to get a faster idle and then back off Idle screw to get a normal idle


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