33 CS-310STORAGE AFTER USE* Technical data subject to change without notice.TECHNICAL DATA• Inspect and adjust every part of the chain saw.- Completely clean every part and repair if neces-sary.- Apply thin coating of oil on metal parts to preventrust.• Remove chain and guide bar.• Drain fuel tank, pull starter slowly a few times todrain fuel from carburetor.• Pour a small amount of clean motor oil into sparkplug hole, pull starter and crank the engine untilpiston reaches: TOP DEAD CENTER.• Store in a dry area, free from dust.WARNINGDo not store in an enclosure where fuel fumes mayaccumlate or reach an open flame or spark.CAUTIONDo not lend or rent your chain saw without theInstruction manual and Safety manual.NOTE• For future reference, you should keep this Instructionmanual and the Safety manual.• If this Instruction manual or the Safety manual hasbecome illegible or is lost, please purchase a new onefrom your ECHO dealer.MODEL CS-310Dimension L × W × H mm 396 × 232 × 268 (15.6 in. × 9.1 in. × 10.6 in.)Mass Power head, dry kg 4.0 (8.8 lb.) Without chain and guide barEngine Type Air-cooled two-stroke single cylinderDisplacement mL (cm ) 30.5 (1.861 cu. in.)Carburetor Diaphragm typeMagneto Flywheel magneto: CDI systemSpark plug NGK BPM8YStarter Recoil starterPower transmission Automatic centrifugal clutchFuel Mixture ratio 50 : 1 ratio with ECHO Power Blend X™, ISO-L-EGD (ISO/CD 13738) and JASO M345-FC/FD two-stroke, air-cooled engine oil.Gasoline Use 89 octane unleaded.Do not use fuel containing methyl alcohol, more than10 % ethyl alcohol or 15 % MTBE.Do not use alternative fuels such as E-15 or E-85.Tank capacity L 0.25 (8.47 US. fl. oz.)Oil Bar and chain ECHO bar and chain oil (or motor oil)Tank capacity L 0.26 (8.81 US. fl. oz.)Guide bar and See page 24 for Chain and Guide Bar Combinationsaw chainLubrication Non-adjustable automatic oil pumpEngine speed Idle r/min 2,800 - 3,150Clutch engagement r/min 4,200Wide open throttle r/min 12,000 - 13,000Standard Front hand guard, Rear hand guard,features Anti-vibration device, Throttle control lockout,Chain brake, Chain catcher, Spark arrestor muffler,Kick guard, (Spiked bumper)