| 3-piece forged & machined crankshaft |
Forged, machined and balanced to withstand 540,000 RPMs/hour(9,000 RPMs @ 60 minutes). |
| Air baffle |
Efficiently channels cooling air from the flywheel across the cylinderfor better engine cooling. |
| Carburetor with high-speed check valve |
Provides efficient fuel delivery at full throttle and insures a smooth idle. |
| Cast iron machined piston rings |
Like pro saws, the two piston rings are machined to a gap of .008" - .010" |
| Cooling plate |
Deflects muffler heat away from cylinder. |
| Crankshaft bearing |
Constructed to turn 1 million revolutions in 2 hours at 9,000 rpm. |
| Dowel pins in ring lands |
Prevents the rotation of piston rings. |
| Easy-access spark plug |
Makes spark plug maintenance easy – just remove the insulated high-tension lead and use the combination wrench to access the spark plug. |
| Easy-service starter pawl |
Independent from the starter rope pulley, enabling easy maintenance for longer pulley life. |
| Emmisions Standards |
This engine meets EPA exhaust emissions regulations for 2010. |
| Floating wrist pin needle bearing |
Reduces wear on wrist pin. |
| Forged connecting rod |
Like pro chain saws, the connecting rod is forged instead of stamped for a longer service life. |
| Formed flexible intake manifold |
Connecting the carburetor to cylinder, the manifold is flexible to isolate it from engine vibration and the interior contains a rough surface to atomize fuel/air mixture and prevent fuel puddling. |
| Fuel tank filter |
Easy to replace fuel filter with an 80-micron rating. |
| Gear driven oil pump |
Pumps oil only when the chain is moving, reducing oil waste. |
| High-impact polymer engine housing |
Manufactured by STIHL, the engine housing is sonically welded and pressure tested. |
| High temperature spark plug |
Fires 200 times per second at 9,000 RPMs. |
| Integral impulse-driven fuel pump |
Designed to limit fuel permeation into the atmosphere for fewer emissions. |
| Integrated fuel tank |
Designed to limit fuel permeation into the atmosphere for fewer emissions. |
| Isolated fuel tank |
Isolated from the engine so the fuel remains cool. |
| Isolated carburetor |
Isolated from the engine to prevent fuel from vaporizing and to maintain proper fuel-to-air mixture. |
| Large cooling finned flywheel |
Large design and 16 cooling fins help keep the engine cool. Balanced and spin tested to 22,000 RPMs. |
| Larger cylinder |
A more robust cylinder with a larger cooling surface area than the MS 230. |
| Limited high-speed mixture screw |
Permits altitude adjustments for peak chain saw performance. |
| Long life fuel pump diaphragms |
Mylar fuel pump and woven silk-coated metering diaphragm resists fuel corrosion for a longer service life. |
| Machine-tooled steel alloy wrist pin |
Ground to a tolerance of .004mm (.00015") to fasten the piston to the connecting rod. |
| Meets ANSI standards |
This saw meets ANSI B175.1 standards. |
| Needle bearings on connecting rod |
A large surface of needle bearing sets help carry the vertical motion load of the piston and connecting rod. |
| Oil tank filter |
Filters out debris in oil tank to keep lubrication flowing. |
| Oval-shaped barrel piston |
Narrower at skirt end, fitting the cylinder as it heats up. |
| Positive sealing vent tank |
Reduces emissions into the air while enabling proper fuel flow. |
| Precision-milled piston |
Piston and Cylinder are machined with very tight tolerances. |
| Solid-state ignition |
The solid-state capacitor discharge ignition module is reliable in all weather. |
| Staggered spaced cooling fins |
Staggered spacing reduces vibration and noise. |
| UL listed |
This saw is listed by Underwriters Laboratory. |
| USFS fire-safe muffler with spark arrester screen |
Baffled and tuned for more tolerable sound. |
| Vented oil tank |
Designed to prevent oil spillage and waste while allowing the easy flow of lubricant. |