The compression button is usually just pressed in and locks until the engine fires. Try starting the engine with and without the release actuated, you will immediately feel the difference. When the engine is cold, it requires pumping the primer bulb about 6 times, then set choke and engine fast idle. Some saws do both automatically when the choke is set, while others require two separate operations. When the engine is warm, it may not require pumping or choke at all.
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The compression button is usually just pressed in and locks until the engine fires. Try starting the engine with and without the release actuated, you will immediately feel the difference. When the engine is cold, it requires pumping the primer bulb about 6 times, then set choke and engine fast idle. Some saws do both automatically when the choke is set, while others require two separate operations. When the engine is warm, it may not require pumping or choke at all.