Muffler Mod on Stihl MS250--Removing Limiter

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WarmGuy

WarmGuy

Minister of Fire
Jan 30, 2006
519
Far Northern Calif. Coast
I'm about to pull the trigger on a muffler mod on my Stihl MS250.

My understanding is that I enlarge the muffler hole, open up the muffler baffle holes with a screwdriver, and eliminate the limiter for the high-speed adjustment.

To remove the limiter do I cut off the metal extension (red arrow) or remove or deform the plastic thing (yellow arrow)?

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Thanks,
 
Correct, Look over on Arboristsite in the chainsaw section and you'll get detailed info. Just know if you go there, you have one saw now-you will soon have several=CAD, I warned you :) I had two, then all the sudden seven...
 
The answer is that you pull off the plastic thing indicated by the yellow arrow. Place a small screwdriver between the plastic thing and the body of the carburetor and twist. It will come out a bit, and then you can pull it off with a pair of needle-nosed pliers. It slides off easily.
 
And it worked great. Started right up. I set the high speed adjustment based on this video:



Made a small change to the idle, too.

Definitely more power, and the saw is behaving perfectly. I should have done this years ago. I used to think maybe I should have bought a bigger saw. Not any more.
 
I have a MS250 and a 440 Magnum. Both are good saws but are monsters to get started. The 440 Magnum was the worst and I would often turn myself into a blue froth pulling on the cord. They have allways been hard to start and I just thought that was the nature of the beast. So I took your advice and opened up the muffler exhaust ports. So now they both started on the first pull using last years gas and they ran like a champ. Your thread was my motivation to do this and I can only say thank you for the instructions. I should have done this years ago. David
 
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