HCS-2810 / 3810 SPECIFICATIONSX7702248301 39© 10/21 ECHO IncorporatedSPECIFICATIONSMODEL HCS-2810 HCS-3810Length 1,055 mm (41.5 in.) 1342 mm (53 in.)Width 258 mm (10.2 in.)Height 195 mm (7.7 in.)Weight (dry) 4.7 kg (10.3 lb.) 4.9 kg (10.8 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 in.3 )Exhaust Spark arrestor muffler or spark arrestor muffler withcatalystCarburetor Diaphragm with purge pumpIgnition System Flywheel magneto, capacitor discharge ignition typeSpark Plug NGK BPMR8Y (Gap 0.65 mm [0.026 in.])Fuel Mixed (Gasoline and Two-stroke Oil)Fuel/Oil Ratio 50:1GasolineUse 89 Octane unleaded. Do not use fuel containingmethyl alcohol, more than 10% ethyl alcohol or 15%MTBE. Do not use alternative fuels such as E-15 orE-85.Oil ISO-L-EGD (ISO/CD 13738) and J.A.S.O. M345- FD,two-stroke, air-cooled engine oil.Fuel Tank Capacity 0.37 L (12.5 US fl. oz.)Starter System Automatic Recoil Starter, centrifugal typeClutch Centrifugal TypeGear Case Ratio 4.6:1Cutter Double Reciprocating Blade, Single SidedLengthBlade 710 mm (28 in.) 955 mm (37.6 in.)Cutting 589 mm (23.2 in.) 834 mm (32.8 in.)Pitch 35 mm (1.38 in.)Height 24 mm (0.94 in.)Maximum Diameter CutSoft Material 25.4 mm (1 in.)