Author Topic: MS181 Running problem  (Read 76 times)

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Offline pg877

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MS181 Running problem
« on: August 09, 2017, 06:39:40 am »
About 6 months ago I got a second hand 3 year old MS181 C and the first few times I tried it it seemed to run ok. It then started to exhibit the following problem. At first I set the control lever to its lowest position and pull it over until it burps, then lift it one notch pull it again and it starts and runs well at a fast idle speed and it will continue to run in this condition with no problems. Once warmed up I gently squeeze the throttle and the lever lifts up another notch and the saw goes into its regular idle speed, but after a few seconds it gets slower and slower until it cuts out. If I try to rev it up it won't and sounds like its bogging down and then cuts out. I can then only restart it a couple times more before it won't start again until it has fully cooled down and each time it cuts out very soon. So far I have fitted a new air filter, cleaned the carb and fitted new gaskets and diaphragm, cleaned the tank breather and checked the fuel filter is not blocked and owing to a high resistance reading on the primary coil have fitted a new ignition coil. The spark plug seems to spark well so have not changed it yet, maybe I should. I have also altered the High / Low and idle settings according to the manual.
The saw still has exactly the same fault every time I try it.
Running out of ideas with this now, can anyone help please.

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Offline Cut4fun .

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Re: MS181 Running problem
« Reply #1 on: August 09, 2017, 01:00:03 pm »
You covered my first WAG's. Have you pulled the muffler for a look at the piston and rings?
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Offline 660magnum

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Re: MS181 Running problem
« Reply #2 on: August 09, 2017, 02:15:29 pm »
If nothing suspicious is found pulling the muffler, looking at the muffler screen, the piston walls, rings, and cylinder walls, the seals are very easy to replace if you remove the engine unit and take off the bottom pan.
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Offline pg877

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Re: MS181 Running problem
« Reply #3 on: August 09, 2017, 05:59:12 pm »
I have removed the muffler and cannot see anything wrong with the piston and rings. The muffler doesn't seem to have a removable screen that I can see.

Offline 660magnum

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Re: MS181 Running problem
« Reply #4 on: August 09, 2017, 06:22:12 pm »
someone may have already removed the screen? I don't live in an area that requires a screen and that's the first thing I take off the saw.
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Offline blueberrymuzik

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Re: MS181 Running problem
« Reply #5 on: August 09, 2017, 09:43:16 pm »
The next time when you start it, let it run until it stops. Then, remove the spark plug and see if it is wet. If it is, your carb is passing too much fuel and flooding out the engine.
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Re: MS181 Running problem
« Reply #6 on: August 09, 2017, 11:06:58 pm »
Yep my guess would have been the spark arrestor but if there is none then I would change out the fuel filter even though you think it is ok.   I have been faked out by the fuel filter before.    Also one other thing you could do is loosen the fuel cap to see if it stays running because of the tank vent.   
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Offline pg877

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Re: MS181 Running problem
« Reply #7 on: August 12, 2017, 08:44:35 am »
The muffler on mine appears to be a sealed unit with no visible spark arrestor or anywhere one would fit. The attached diagram for it shows two types of muffler one with a screen and one without which I assume is the one I have.
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Offline 660magnum

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Re: MS181 Running problem
« Reply #8 on: August 12, 2017, 02:45:56 pm »
You're located in England and the mufflers do not have spark arresters there
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