Set Your Chainsaw Coil Gap PERFECT Every Time! @TheRepairSpecialist

Uploaded January 2026 | Updated September 2026, 1 week ago

It’s vital to set the air gap correctly between the flywheel magnets and the ignition coil on a chainsaw because this gap directly affects spark strength and ignition timing. If the gap is too wide, the magnetic field isn’t strong enough to generate a reliable spark, which causes weak running or no-start issues. If the gap is too tight, the flywheel can actually rub the coil, damaging both parts and throwing off the timing.

A quick, practical way to set the air gap in the field is to use a business card as a spacer. Place it between the flywheel magnets and the coil legs, let the magnets pull the coil down, then tighten the coil bolts before removing the card. This gives a good working clearance that’s close to spec.

For the most accurate setup, though, the correct method is to use a set of feeler gauges. Most chainsaws call for a gap in the range of 0.2–0.4 mm (0.008–0.016 inch), and a feeler gauge ensures you’re right within the manufacturer’s specification every time.

Getting this simple adjustment right means a stronger spark, easier starting, and longer life for both your flywheel and coil.

Have a great day

Craig

Set Your Chainsaw Coil Gap PERFECT Every Time!

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$POWER STROKE on a 4 Stroke Engine! (by Craig Kirkman) Here are some interesting facts about the power stroke in small four-stroke engines: Combustion Event: The power stroke is where the actual combustion occurs. Following the compression stroke, the air-fuel mixture is ignited (in gasoline engines) or self-ignites (in diesel engines), resulting in a rapid expansion of gases that drives the piston downward. Energy Production: The energy released during combustion pushes the piston down with significant force, converting the chemical energy of the fuel into mechanical energy. This is the primary action that produces the engines power output. Pressure Peaks: During the power stroke, cylinder pressure can reach very high levels, often exceeding 1,500 psi (pounds per square inch) in small engines. This high pressure is essential for maximizing the force exerted on the piston. Crankshaft Rotation: The downward movement of the piston during the power stroke is converted into rotational motion by the crankshaft. This rotational motion ultimately powers the vehicle or machinery the engine is attached to. Duration: The power stroke occurs over a relatively short duration compared to the other strokes. The actual combustion and expansion take place in a fraction of a second, leading to a rapid change in pressure and temperature. Exhaust Valve Timing: The timing of the exhaust valve opening is critical. It needs to be carefully coordinated to allow the exhaust gases to exit the cylinder without hindering the power stroke. Poor timing can result in back-pressure, reducing overall efficiency. Turbocharging Benefits: In turbocharged engines, the power stroke can be enhanced by forcing more air into the cylinder, allowing for more fuel to be burned. This can significantly increase the power output without increasing engine size. Vibration and Noise: The explosive nature of combustion during the power stroke generates vibrations and noise. Engine design often includes dampening systems to reduce these effects, improving comfort and longevity. Fuel Quality Impact: The quality of the fuel used can affect the efficiency and smoothness of the power stroke. Higher-quality fuels can burn more completely, resulting in better performance and fewer emissions. Heat Dissipation: A significant amount of heat is generated during the power stroke, requiring effective cooling systems to prevent overheating. Proper cooling helps maintain engine integrity and performance over time. Understanding the power stroke is crucial for appreciating how small four-stroke engines generate the power necessary for various applications, from lawn mowers to generators. Have a great day Craig Kirkman (Owner and Creator of The Repair Specialist Channel)$

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