Stihl MS250

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REMOVING AND REPLACING TWO DIFFERENT SIZE BARS, SAW CHAINS, AND CHAIN
SPROCKETS ON A STIHL
®
MS 250 CHAINSAW

Stihl MS250 Specifications

General

Displacement	45.4 cc
Engine type	2-stroke
Ignition system	Electronic
Fuel Capacity	0.47 L (15.9 oz)
Chain Oil Capacity	200 cc
Guide Bar Length	40 cm (16 inches)
Oilomatic chain pitch	3/8"
Bar length range	16 in to 18 in
Weight	4.6 kg (10.1 lbs) without bar and chain

Summary

INTRODUCTION

DESCRIPTION OF THE EQUIPMENTPROCESS

Describes the purpose of changing bar, chain, and sprocket on STIHL MS250.

LIST OF MATERIALS AND EQUIPMENT

DISENGAGE THE CHAIN

REMOVE SPROCKET COVER

Steps to remove the chain sprocket cover using a wrench.

REMOVE THE 14 BAR AND 14 SAW CHAIN

CLEAN THE CHAIN SPROCKET AREA

Process for cleaning the chain sprocket area of debris.

REMOVE C-CLIP AND WASHER

Steps for removing the C-clip and washer from the crankshaft.

REMOVE THE 14 CHAIN SPROCKET

REMOVE AND OIL THE BEARING

Procedure for removing, oiling, and replacing the crankshaft bearing.

INSTALL THE 18 CHAIN SPROCKET

LOCK THE SPROCKET WITH WASHER AND C-CLIP REPLACE THE WASHER COVER

Securing the sprocket using the washer and C-clip, then replacing the cover.

MOVE ADJUSTING PIN TO ASSEMBLY POSITION

PLACE THE 18 BAR ON THE SAW

Mounting the 1/8" bar onto the chainsaw, ensuring proper alignment.

PLACE THE 18 SAW CHAIN AROUND THE BAR

Routing the 1/8" saw chain around the bar and sprocket correctly.

REINSTALL THE SPROCKET COVER

TIGHTEN THE BAR

TIGHTEN THE SAW CHAIN

Adjusting the chain tension to the correct level.

CONCLUSION

TROUBLESHOOTING SECTION

Provides solutions for common issues encountered during the procedure.