STIHL MS 500i Fuel Injected Gas Chainsaw (79.2cc) - 28"

The STIHL MS 500i is a professional gas chainsaw built for felling and bucking crews who need class-leading power without the extra weight. Fitted with a 28" bar, it's suited to processing large timber where speed and manoeuvrability both matter.

The first electronically fuel-injected STIHL chainsaw

Rather than a traditional carburetor, the MS 500i uses electronic fuel injection to meter fuel precisely, so the engine starts easily and holds consistent power across changes in altitude, temperature, and fuel quality.

Class-leading power-to-weight ratio

A 79.2cc engine produces roughly 5.0 kW (6.7 hp) in a power head that weighs about 14 lb before the bar and chain are fitted, giving operators strong cutting power without the bulk of a heavier saw.

Built for demanding professional use

Manual decompression eases starting, side-mounted chain tensioning speeds up field adjustments, and a tool-free fuel cap keeps refuelling quick during long shifts.

Key features

• 79.2cc engine with electronic fuel injection
• Approx. 5.0 kW (6.7 hp) power output
• 28" guide bar with 3/8" pitch, .063" gauge chain
• Manual decompression valve for easier starting
• Side-mounted, tool-free chain tensioning
• Tool-free fuel cap

Specifications

Frequently asked questions

What fuel does the MS 500i use?

Like other STIHL gas chainsaws, it runs on a 50:1 mix of unleaded gasoline (minimum 89 octane, no more than 10% ethanol) and STIHL two-stroke engine oil, fed through its electronic fuel injection system.

Why does it use fuel injection instead of a carburetor?

Fuel injection meters fuel more precisely than a carburetor, which helps the MS 500i start reliably and maintain consistent power across different altitudes and temperatures.

Who is the MS 500i designed for?

It's built for professional fallers and forestry crews handling large-diameter timber who want strong power in a comparatively light, manoeuvrable saw.

What is in the box

The MS 500i ships with the powerhead, a 28" guide bar, a 3/8" pitch saw chain, a bar scabbard, the onboard tool kit, and the owner's manual. Fuel and bar oil are sold separately.