STIHL MS 500i
The STIHL MS 500i is a powerhouse professional chainsaw known for being the first fuel-injected model in the industry, delivering unmatched acceleration, torque, and cutting power for heavy-duty forestry and logging work. Featuring a 79.2 cc engine that produces about 6.7 horsepower, this saw is designed to handle extremely large timber with ease, making it ideal for felling massive trees, bucking large logs, and even chainsaw milling. It supports bar lengths from 16 to 36 inches, though most professionals find 25–30 inches to be the sweet spot for balance, reach, and cutting efficiency. With this range, the MS 500i can cut through logs well over 30 inches in diameter, depending on wood hardness and technique. What sets it apart is its electronic fuel injection (EFI) system, which automatically always adjusts fuel delivery for perfect combustion; there’s no carburetor to tunes, it starts easily in all weather and maintains peak power at any altitude. For best performance and efficiency, always pair it with a sharp chain, a properly matched bar, and high-quality fuel (preferably 89-octane or higher, non-ethanol if available). Let the saw reach full RPM before cutting and feed it steadily through the wood rather than forcing it this keeps the chain speed high and reduces bogging or vibration. Keep the air filter and intake area clean, especially since the 500i’s high airflow design tends to collect fine sawdust quickly; clean it daily in dusty conditions. Regularly check chain tension, bar groove, and sprocket wear, as loose or worn components can lead to performance loss or safety hazards. Common troubleshooting issues include slow cutting (usually caused by a dull chain or clogged filter), hard starts (most often from stale fuel or a hot engine; let it cool briefly), and chain loosening (from improper tension or bar wear). The MS 500i also benefits from letting it idle briefly after long cuts to cool down evenly before shutting off, which helps protect internal components. To maximize efficiency, use fresh fuel and good two-stroke oil, keep the chain oiled adequately, and clean the saw regularly to maintain airflow and lubrication. Despite its size and power, the saw is well-balanced thanks to STIHL’s anti-vibration system and excellent weight distribution, making it surprisingly comfortable for extended use. Overall, when used correctly, the MS 500i delivers extraordinary cutting performance, superb fuel efficiency, and reliability, excelling at demanding professional tasks where speed, power, and precision are essential.
Wood size capabilities & recommended uses
The MS 500i is a high-displacement professional chainsaw: it has a 79.2 cc engine (≈4.83 in³) producing approximately 6.7 bhp (≈5.0 kW) according to STIHL.
It weighs about 13.9 lbs. (≈6.3 kg) for the powerhead only.
The recommended guide-bar length range is listed as 16″-36″ (40 cm-90 cm).
In practical terms , that means:
- This machine is aimed at serious harvesting, large-tree felling, heavy bucking and milling type work, not just light limbing or small tree removal. With the option of up to a 36″ bar, it can handle large logs.
- That said, its capacity will depend on wood species, green vs dry, binding conditions, chain sharpness and bar length. A 20-25″ bar would be a very capable all-round setup; 30-36″ bars would be for very large logs or milling.
So in summary:
Use it when you have logs in the large-diameter category (20″+, maybe 30″ and above depending on conditions) and you need serious cutting power. For smaller diameter (say under ~12-18″) it will work, but might be overkill in terms of size, cost and setup. Its best use is as a heavy-duty machine for professional or high-volume work.
Easy troubleshooting tips
Here are some common issues and how to address them when using the MS 500i:
Problem: Slow cutting, bogging, or lack of full power
- Cause: dull or incorrect chain, improper bar length/chain size for the job, or filter/air intake issues. Ensure you are using the correct chain pitch, gauge and a sharp chain. Some users note that using too long a bar or pushing too hard can reduce efficiency.
- Cause: air intake clogging; this saw “eats air” and depending on usage (dusty, dry wood, heavy duff) the filter must be cleaned often.
- Fix: Keep the air filter and intake clean; ensure chain is sharp; choose a bar length matched to the job so you’re not over-loading the saw.
Problem: Hard to start (especially warm starts) / stalling
- Since this saw uses an electronically controlled fuel injection system, there are fewer manual carburetor adjustments needed. But some users report warm-start issues, possibly due to vapor lock or fuel system heat.
- Fix: Use fresh fuel, make sure fuel cap vent is clear, inspect fuel system if warm starts are recurrent. Also, follow the proper start-procedure as per the manual (primer, choke, stop switch, etc.).
Problem: Chain loosening or rapid wear
- Ensure proper tension: side-access chain tensioner is provided on this model for convenience.
- Ensure you’re using the correct bar/chain combo and that the rim of the bar and sprocket are in good condition. Incorrect combinations cause wear and may cause loosening.
Problem: Excessive vibration / fatigue
- While the MS 500i has an anti-vibration system, some users found the vibration still high when using very long bars or heavier bar/chain combos, especially for limbing.
- Fix: Choose a bar length appropriate to your purpose; ensure you maintain proper grip and body posture; consider breaking up heavy jobs into intervals to reduce fatigue.
Best practices for efficiency
To get the most out of the MS 500i and use it efficiently:
- Choose the right bar length for the job. If you’ll be cutting mostly large trunks, a 25″–30″ bar might be appropriate. But if you’re doing a mix of tasks or want better maneuverability, a 20″–25″ bar may give you a better balance. The spec sheet supports 16″–36″ range, but longer bars demand more from the saw and operator.
- Keep the chain sharp: A sharp chain cuts faster, reduces engine load and fuel consumption. Monitor chip size: large wood chips = good; fine sawdust = dull chain.
- Proper feed technique: Let the saw run at full throttle and feed it steadily; don’t force the saw through large cuts quicker than it can handle. Over-feeding causes bogging, higher vibration, and wear.
- Air filtration & maintenance: Since the 500i draws high airflow and is used for heavy work, clean the air filter at appropriate intervals; daily if in dusty/dry conditions. Also keep bar groove, sprocket, chain oil feed, and cooling fins clean so the saw stays cool and lubricated.
- Lubrication and chain oil: Use a good quality chain oil and monitor the oil delivery. The MS 500i supports the Ematic™ system when paired with Ematic bars, which is helpful for heavy duty use.
- Fuel quality: Because the engine has EFI (electronic fuel injection), it’s more sensitive to fuel quality. Use high-octane (minimum 89 AKI) gasoline, avoid high ethanol blends, and consider using fuel stabilizer if stored. This reduces bad starts or inconsistent performance.
- Allow proper warm-up and cool-down: Let the saw idle for a minute after heavy cutting before shut-off, and let it warm-up before heavy cuts to ensure everything is at working temperature and oil is flowing properly
- Respect the saw’s limits: Even though this is a very capable saw, every machine has its limits. If you’re doing constant 30″+ hardwood mills or extreme conditions (very binding wood, heavy stumps, etc.) consider bigger setups or staged cuts. Pushing too far reduces lifespan and efficiency.
- Operator fatigue and ergonomics: With heavier bars and long sessions, fatigue will reduce cutting quality and safety. Use proper stance, two-hand grip, break up sessions, make sure your body is aligned, keep tools at good working height.
