Author Topic: more power MS250 stihl  (Read 3569 times)

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Offline 660magnum

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Re: more power MS250 stihl
« on: July 23, 2014, 10:58:05 pm »
To mod the muffler . . .

Remove the muffler from the engine by removing the two nuts.

Lift the spark screen cover from the muffler.

There is a rectangle depression in the main muffler body underneath the spark screen.

This depression typically has a 12mm hole in it. Open the hole up with a round and rectangle file to be as big as the flat part of the depression.

On the side of the muffler body that fastens to the engine, there is a cage in there with several 5mm holes. Open up all these to a larger size that you can.

Be sure to remove all the metal filings from the muffler by washing and blowing it out with a air hose.

Re-install the muffler with the bolts first, then the shield, gasket, muffler, cover, and nuts.

You must re-tune the carb with the mesh air filter and air filter cover installed.
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