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

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Offline 660magnum

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Re: more power
« on: July 22, 2014, 09:53:59 pm »
The 42.5 mm is the biggest you can go with that family. The engine is a clamshell design with the cylinder and the upper half of the crankcase as one piece. Not a whole lot you can do with them. Most of the 025/MS250 is plastic with a metal engine unit sandwiched inside.

The 026/MS260 is a engine with a separate cylinder and crankcase. The crankcase serves as part of the frame of the whole chainsaw.

The MS250 responds well to opening up the muffler (Muffler Mod), Installing a WT215 Walbro carb ($22.45) but with most of them you will also need a tank vent/needle valve guide to match the WT215 with it's needle valves close together. Most MS250's came from the factory with a Zama carb with the High speed needle at the back of the carb and the low speed needle down low at the front of the carburetor.

Most of the aftermarket flocked air filters are very restrictive. You can get a aftermarket nylon mesh filter that lets them breathe better.

In spite of the MS250 normally coming with a 18" bar, .325 / .063 chain, I like the 16" bar with Stihl RS chisel (Yellow) chain.

Set up this way, they are a pretty hot little limbing saw.
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