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ENGINE IDENTIFICATION21 67 893511104121. Carburetor2. Stop switch3. Rope handle4. Fuel fill5. Air cleaner6. Choke lever7. Spark plug8. Fuel return hose9. Fuel intake hose10. Primer bulb11. Engine Model Type Codexxxxxx xxxx xxxxxxxx12. Oil fill / dipstick13. Fuel tank13FUEL AND OIL RECOMMENDATIONSLubricationGasolineThese engines are certified to operate on unleadedgasoline. Use clean, fresh, regular unleadedgasoline with a minimum of 85 octane. Do not mix oilwith gasoline. Fresh fuel prevents gum from formingin fuel system or on essential carburetor parts.Purchase fuel in quantity that can be used within 30days to assure fuel freshness. We recommend theuse of Briggs & Stratton Gasoline Additive. (Seeyour Authorized Briggs & Stratton Service Dealerfor Part No. 5041 or the single-use pouch.)In countries other than U.S.A., leaded gasoline maybe used if it is commercially available and unleadedis unavailable.NOTE: Some fuels, called oxygenated or reformulatedgasolines, are gasoline blended withalcohols or ethers. Excessive amounts ofthese blends can damage the fuel system orcause performance problems. Do not usegasoline containing Methanol. If any undesirableoperating symptoms occur, use gasolinewith a lower percentage of alcohol or ether.Oil has four purposes. It cools, cleans, seals andlubricates. During normal operation, small particlesof metal from the cylinder walls, pistons, bearingsand combustion deposits will gradually contaminatethe oil. Dust particles from the air also contaminatethe oil forming an abrasive mixture which can causewear to all of the internal moving parts of the engine,if the oil is not changed regularly. Fresh oil alsoassists in cooling. Old oil gradually becomes thickand loses its cooling ability as well as its lubricatingqualities.Oil RecommendationsUse a high quality detergent oil classified “For ServiceSF, SG, SH, SJ” or higher. Briggs & Strattonstrongly recommends the use of synthetic oil suchas Briggs & Stratton (#100030C) or equivalent. Ifsynthetic oil is not available, Briggs & Stratton nonsynthetic30 weight oil is an acceptable substitute.No special additives should be used with recommendedoils.Do not mix oil with gasoline.5