30specIfIcatIonsMODEL ---------------------------------------------------- SRM-225Length w/o cutter head ------------------------------------ 1793mm (70.6 in.)Width -------------------------------------------------------- 251 mm (9.88 in.)Height ------------------------------------------------------- 328 mm (12.9 in.)Weight (dry) w/o Cutter Head---------------------------- 5.5 kg (12.1 lb.)Engine Type ------------------------------------------------ Air cooled, two-stroke, single cylinder gasoline engineBore ---------------------------------------------------------- 32.2 mm (1.27 in.)Stroke -------------------------------------------------------- 26.0 mm (1.02 in.)Displacement ----------------------------------------------- 21.2 cc (1.29 cu. in.)Exhaust ------------------------------------------------------ Spark arrestor muffler or spark arrestor muffler with catalystCarburetor--------------------------------------------------- Zama diaphragm model w/purgeIgnition System -------------------------------------------- Flywheel magneto, capacitor dischargeSpark Plug -------------------------------------------------- NGK BPM-8Y (Gap 0.65 mm (0.026 in.)Fuel ---------------------------------------------------------- Mixed (Gasoline and Two-stroke Oil)Fuel/Oil Ratio ---------------------------------------------- 50 : 1 Power Blend X™ ISO-L-EGD (ISO/CD 13738) andJ.A.S.O. M345- FC/FD, two-stroke, air-cooled engine oil.Gasoline ----------------------------------------------------- Use 89 Octane unleaded. Do not use fuel containing methylalcohol, more than 10% ethyl alcohol or 15% MTBE. Do not usealternative fuels such as E-15 or E-85.Oil ------------------------------------------------------------ Power Blend X TM Premium Universal 2-Stroke OilFuel Tank Capacity ---------------------------------------- 0.44 lit. (14.9 US fl. oz.)Starter System ---------------------------------------------- Automatic Rewind StarterClutch-------------------------------------------------------- Centrifugal TypeVibration Isolated System -------------------------------- Rubber cushion on engine mount (heavy duty). Rubber grip onfront handleOperating Rod ---------------------------------------------- 25.0 mm diameter aluminum TubeDrive Shaft ------------------------------------------------- 6.35 mm (1/4 in.) flexible shaftGear Case Ratio -------------------------------------------- 1.4:1 ReductionRotating Direction ----------------------------------------- Counter Clockwise; viewed from topCutter Head ------------------------------------------------- Nylon line head (2-line) with .095 Crossfire™ Line capacity 7m(24 ft.)Handle ------------------------------------------------------- Front - Loop, Rear Handle (w/o rubber)Shoulder Harness ------------------------------------------ OptionalIdle Speed --------------------------------------------------- 2,500 - 3,000 RPMClutch Engagement Speed -------------------------------- 3,800 RPMWide Open Throttle Speed (W.O.T.) ------------------- 7,600 - 8,700 RPM