With a 16-inch bar, built-in felling sites, anti-vibration system and a tested 14,000 rpm capacity, the Stihl MS 250 chainsaw offers industrial strength features at home consumer prices. Still, even quality products sometimes break down, and when they do, it is sometimes difficult to locate the problem. Fortunately, several common troubleshooting tips can help the home arborist get back to work before the winter.
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Engine Will Not Turn Over
Sometimes after several uses, the Stihl MS 250 will not power on. The most common reason for the chainsaw engine not turning over is a fouled spark plug. While this is remedied by replacing the spark plug, the problem will recur if the reason for the spark plug failure is not corrected. Incorrect fuel mix and clogged air filters are often responsible for spark plugs breaking prematurely. Correct this issue by emptying the chainsaw of fuel mix and filling it with freshly mixed fuel, making sure to consult the manual for correct mix ratio. Inspect the air filter for malfunction or excessive dirt, and clean or replace if necessary.
Rope Has No Tension and Will Not Recoil
If you pull at the Easy2Start pull cord and it does not recoil, turn off the chainsaw 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 slack pull cord usually means a broken rewind spring. Replace the rewind spring by removing the rope rotor, and removing the broken spring from the rotor assembly. Once all bits of the spring are removed, lubricate the new spring with resin-free oil, and place it carefully in the fan housing engaging the spring loop with the lug in the fan housing. Push the spring using a small screwdriver into its housing until it fits snugly and evenly. Reinstall the rope rotor and tension the rewind spring and reassemble the outer casing.
Reduced Engine Power
The most common cause of reduced engine power in the Stihl MS 250 chainsaw is a dirty air filter. A blocked filtration system can reduce combustion rate and cause the chainsaw to run less efficiently. Clean the filter by pressing down on the throttle trigger interlock and moving the master control lever to cold start. Turn the twist lock to the left about 90 degrees, and lift off the carburettor casing, exposing the air filter. Clear away any dirt or grime and replace damaged elements with fresh parts. Once finished, replace the carburettor and restart the engine.
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