With a 16-inch (40-centimeter) bar, short-location features, anti-vibration system and a proven 14,000 rpm capacity, the Stihl MS250 chainsaw offers industrial-strength features at consumer prices. However, even quality products sometimes break, and when they do, it’s sometimes difficult to pinpoint the problem. Fortunately, there are several common troubleshooting tips that can help you get back to work before winter.
Engine won’t start
Sometimes, after several uses, the Stihl MS250 won’t start. The most common reason for the engine not starting is a fouled spark plug. While this is fixed by replacing the spark plug, the problem will recur if the reason for the spark plug failure is not corrected. Improper fuel mixture and clogged air filters are often responsible for short spark plug life. Correct this problem by draining the fuel from the chainsaw and filling it with freshly mixed fuel, so be sure to consult the manual for the correct mixture ratio. Inspect the air filter for malfunction or excessive dirt, and clean or replace it if necessary.
Rope has no tension and will not pull back.
If you pull on the Easy2Start pull cord and it does not retract, turn off the saw immediately. A loose pull cord can easily get caught in the saw blade and cause damage to the machine or injury to the operator. A loose pull cord usually means a broken rewind spring. Replace the rewind spring by removing the rotor from the cord, and removing the broken spring from the rotor assembly. Once everything is removed, lubricate the new coil with oil free resin, and carefully place it in the fan housing with the terminal. Push the spring in with a small screwdriver until it fits snugly and evenly. Replace the rope rotor and rewind spring tension and reassemble the outer casing.
Reduction in motor power
The most common cause of reduced engine power on the Stihl MS250 chainsaw is a dirty air filter. A blocked filtration system can reduce the combustion rate and cause the chainsaw to run less efficiently. Clean the filter by pressing in the trigger and moving the cold start control lever. Turn the twist lock counterclockwise about 90 degrees, and lift the carburetor cover, exposing the air filter. Clean off any dirt or grime and replace damaged items with new parts. Once finished, replace the carburetor and start the engine.