What Is The Stihl 029 Super Engine? (Engine Specs)
The STIHL 029 Super is a gasoline-powered, single-cylinder, two-stroke chainsaw with 56.5 cm³ (3.45 cu in) displacement and about 3.0 kW (4.1 bhp) rated output. Its commonly cited engine speeds are 12,500 rpm maximum and 2,800 rpm at idle. Use fresh 50:1 fuel mix, and verify bar and chain fit before cutting.
Putting straight gasoline in a two-stroke saw can deprive the engine of needed lubrication and cause severe damage, including piston or cylinder seizure. That is why I separate the 029 Super’s engine specifications from setup assumptions: the engine size alone does not determine the right bar, chain, or cutting task.
STIHL 029 Super engine specifications
The 029 Super’s engine is a 56.5 cm³, air-cooled, single-cylinder two-stroke. Displacement describes the volume swept by the piston; it helps identify engine size, but it is not a direct measure of cutting speed or a guarantee that a particular bar is suitable.
| Specification | Reference value |
|---|---|
| Engine type | Gasoline, single-cylinder, two-stroke |
| Displacement | 56.5 cm³ (3.45 cu in) |
| Bore × stroke | 46 × 34 mm |
| Rated output | About 3.0 kW (4.1 bhp) |
| Maximum engine speed | About 12,500 rpm |
| Idle speed | About 2,800 rpm |
| Fuel mix | 50:1 gasoline to suitable two-stroke oil |
The bore is the cylinder’s inside width. The stroke is the distance the piston moves inside it. Together, those measurements help describe engine size, while rated output describes power under specified test conditions.
The speed figures are service-reference values, not instructions to adjust the carburetor by ear. Actual tuning must follow the correct model-specific service procedure and tool instructions. If the saw races at idle, stalls, or the chain moves while idling, stop using it until the cause is checked.
Fuel mix and engine basics
A two-stroke engine completes its power cycle in two piston strokes. In this type of saw, the gasoline and oil are mixed before use, so the fuel also supplies lubrication to engine parts. The specified mix for the 029 Super is 50:1, but always check the saw and oil instructions.
At 50:1, mix 50 equal parts gasoline to one part suitable air-cooled two-stroke oil. For example, that is 100 mL of oil for 5 L of gasoline. Use fresh unleaded gasoline and oil intended for air-cooled two-stroke engines. Do not use straight gasoline, and do not guess at the ratio.
Mix fuel in a clean, suitable container and label it clearly. Follow the oil maker’s directions and the saw manual for fuel handling and storage. If you are unsure what is already in the tank, do not start the saw until the fuel has been identified or replaced safely.
Bar and chain fitment
The bar is the guide that supports the chain. The chain’s pitch, gauge, and drive-link count must match the bar and drive sprocket; a mismatch can prevent correct fit or operation. The saw’s displacement does not, by itself, confirm that a given bar and chain will fit.
The 029 Super is commonly set up with a 3/8-inch chain pitch. However, the chain gauge and number of drive links depend on the bar and sprocket actually installed. Do not assume a .050-inch or .063-inch gauge. Read the bar markings and verify the sprocket and chain specifications.
| Fitment detail | What to check |
|---|---|
| Pitch | Match the chain, bar, and drive sprocket |
| Gauge | Match the chain to the bar groove |
| Drive links | Match the chain length to the bar |
| Bar length | Confirm it is approved for the saw and task |
Many setups use 16- to 20-inch bars, but this is not a fitment guarantee. Check the model’s bar-and-chain chart or the saw’s instructions. If a bar has been changed, verify its markings rather than relying on the saw’s original configuration.
For example, if a replacement chain fits around a bar but its gauge does not match the bar groove, do not use it. If the pitch differs from the sprocket, the parts are still incompatible even if the chain appears to sit on the bar. Check all three parts before cutting.
Equipment Setup and Safety Preparation
Before using the 029 Super, check the saw, protective gear, and work area. A sound engine does not make a saw safe by itself; the chain brake, controls, chain condition, lubrication, and site all matter. If a safety part is damaged or does not work, do not operate the saw.
Wear a helmet with face and eye protection, hearing protection, chainsaw-protective legwear, gloves, and boots. Check the equipment instructions for fit and care. Inspect the chain brake, throttle lockout, chain catcher, bar, chain tension, and chain lubrication system before starting.
Look over the work area. For cutting or felling, assess the tree’s lean, overhead hazards, wind, nearby people, and possible escape paths. Set a clear work zone and plan where you can move if the tree or material shifts. Felling requires skill and a sound assessment; get trained help if you cannot judge the hazards or plan the cuts.
Field Cutting Operation
Safe operation means starting the saw as instructed, keeping a firm two-handed grip, and using a sharp, compatible chain without forcing it. The guide-bar nose is a key hazard area: contact at its upper quadrant can cause rotational kickback, which can throw the bar rapidly toward the operator.
Engage the chain brake and start the saw on firm ground using the prescribed cold- or warm-start steps. Do not drop-start it. Keep the brake engaged until you are ready to cut, then hold the saw with both hands and release the brake only when positioned to work.
Keep the guide-bar nose away from wood and other objects, especially its upper quadrant. Do not cut above shoulder height. Keep the bar clear of the ground, and let a sharp chain do the work rather than forcing the saw through a cut.
Stop if the chain becomes dull, loose, or poorly lubricated. Check the instructions for the correct tensioning method, and allow hot parts to cool before maintenance. Follow applicable ANSI Z133 and OSHA requirements for chainsaw work; felling should be done only by someone competent in site assessment and proper notch and hinge technique.
Maintenance, Sharpening, and Tuning
Routine checks help the engine and cutting equipment work as intended. A dull chain can make cutting harder and tempt you to push the saw; stop and sharpen or replace it instead. Use the correct chain specifications and sharpening method for the installed chain.
With the saw switched off, check chain tension and inspect the cutters, bar groove, and lubrication areas. Clean debris from the air-intake and bar-groove areas as directed in the manual. Confirm that the chain receives oil; a dry-running chain and bar can wear quickly.
Treat idle and maximum-speed figures as references, not targets for casual adjustment. Carburetor tuning can affect safe operation and engine life. If the chain moves at idle, the engine will not idle steadily, or it runs poorly, stop and follow the model-specific troubleshooting or service instructions. Have a qualified technician check it if the cause is not clear.
After cutting, engage the brake, switch off the saw, and let it cool before cleaning or inspecting it. Refuel only with the engine stopped and cool. Keep fuel away from hot parts and follow the manual’s handling directions.
Storage and Seasonal Care
Prepare the saw for storage according to its manual and the fuel and oil makers’ directions. Fuel condition can change during storage, and old or unsuitable fuel can cause starting or running problems. Do not assume a saw is ready to use just because it ran well before being stored.
Before the next use, check the bar and chain fit, chain tension, lubrication, controls, and safety parts. If you find damage, a fuel leak, or a safety feature that does not work, do not start the saw until the problem is addressed.
Conclusion
The STIHL 029 Super is a 56.5 cm³ two-stroke chainsaw rated at about 3.0 kW. The key ownership points are simple: use the correct 50:1 fuel mix, treat speed figures as service references, and confirm the bar, chain, and sprocket match. Check the manual and safety equipment before operating.
Frequently asked questions
What is the displacement of a STIHL 029 Super?
It is 56.5 cm³, or about 3.45 cubic inches.
How much power does the 029 Super make?
Its rated output is about 3.0 kW, or 4.1 bhp.
What are the bore and stroke?
The bore is 46 mm and the stroke is 34 mm.
What is the fuel mix for a STIHL 029 Super?
Use a 50:1 mixture of fresh unleaded gasoline and suitable air-cooled two-stroke oil, subject to the saw and oil instructions.
Can I run the 029 Super on straight gasoline?
No. The two-stroke engine needs oil in the fuel mix for lubrication. Straight gasoline can cause severe engine damage.
What are the 029 Super’s idle and maximum engine speeds?
Common service-reference figures are about 2,800 rpm at idle and 12,500 rpm maximum. Use the model-specific tuning procedure rather than treating these numbers as adjustment instructions.
What chain pitch does the 029 Super use?
Three-eighths inch is a common setup, but verify the installed bar and drive sprocket. Pitch, gauge, and drive-link count must all match.
Can I use a 20-inch bar on the 029 Super?
Some setups use bars in the 16- to 20-inch range, but that does not confirm compatibility. Check the saw’s bar-and-chain chart and the installed parts.
Why does the chain move while the saw idles?
A chain that moves at idle can signal a fault or incorrect adjustment. Stop using the saw and follow its service instructions or have it checked by a qualified technician.
What is the main kickback risk?
Contact with an object at the guide-bar nose’s upper quadrant can cause the bar to move rapidly back toward the operator. Keep that area clear and hold the saw with both hands.
(This article was written by one of our staff writers, Evan Bradley. Visit our Meet the Team page.)
