Stihl MS 500i Chainsaw

STIHL MS 500i: The World’s First Fuel-Injected “Game-Changer” Chainsaw

The STIHL MS 500i is a revolutionary milestone in forestry equipment, standing as the world’s first production chainsaw equipped with electronically controlled fuel injection. Completely discarding the traditional carburetor, this 79.2cc professional powerhouse delivers an unbelievable acceleration curve—spooling from 0 to 100 km/h in just 0.25 seconds. By utilizing a specialized sensor network to continuously monitor ambient temperature and crankcase pressure, the internal ECU calculates the precise fuel ratio up to 230 times per second, adapting instantly to altitude or weather shifts without manual choke settings. Generating 6.7 bhp / 5.0 kW while weighing only 6.3 kg (bare powerhead), the MS 500i boasts the industry’s best power-to-weight ratio (1.24 kg/kW). For arborists, loggers, and commercial forestry crews handling heavy timber harvesting or limb reduction, it provides immediate throttle response, low exhaust emissions, and unmatched cutting efficiency.

• Choke-Free Direct Injection (STIHL Injection): Eliminates the carburetor and cold-start choke levers entirely. Starting requires just a few purger primes and a pull of the cord, delivering immediate high-torque throttle response in any temperature.

• Real-Time Sensor-Controlled Engine Calibration: Built-in internal pressure and temperature sensors constantly stream ambient conditions to the engine control unit (ECU), ensuring optimal fuel metering and ignition timing under heavy load or changing weather.

• Compact Generator Power Supply: Powered by an integrated internal generator rather than flywheel magnets, allowing for a smaller fan wheel, lower rotational mass, and ultra-compact engine housing.

• Radial-Seal HD2 Air Filter: Built with high-density PET material featuring a radial airtight seal. It traps micro-fine dust particles before they reach the engine, extending filter life and safeguarding internal components during dry wood felling.

• Plunge-Cutting Laser Housing Markings: Features dedicated directional sightlines embedded directly into the fan housing, giving operators accurate visual guides when executing plunge cuts or complex felling techniques.

• Optimized Radial Bumper Spikes: Extended tooth geometry designed around tree trunk contours, allowing the saw to bite firmly into timber when bucking or felling heavy hardwood stems.

• Captive Sprocket Cover Nuts: Designed with retained bar nuts on the lightweight sprocket cover, making field bar and chain replacements quick and preventing lost hardware in forest undergrowth.

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