RedMax HTZ 2401 Service Bulletin

1/4 PageEMISSIONS SERVICE BULLETINRef No. 10-01-R2Issued in: Nov. 2010To: All RedMax Distributors and DealersSubject: Emission Carburetor: Low Speed/ High Speed Mixture Needle andAltitude Adjustment ProceduresEmissions Carburetor: Walbro-Model: WYA- 67A - PART # 848-F0G-8101 (511354201)PRODUCT MODEL ENGINE SERIAL NUMBERHedge Trimmer:HTZ 2401(L)/ HTZ 2460(L)CHTZ 2401(L)/ CHTZ 2460(L)From:All units listed with above carburetor models.The carburetors on the listed model have been factory preset to C.A.R.B. Tier III and E.P.A Phase IIemissions regulations. The Idle-speed adjustment is controlled by idle speed throttle valve screw.The HIGH-speed and Low-speed mixture needles have been preset and sealed to insure compliance withemission regulations. The Low-speed Fuel mixture needle adjustment controls the Fuel/ Air mixture atidle and mid-range engine speeds. The High-speed Fuel mixture needle1. REQUIRED TOOLSadjustment controls the Fuel/Airmixture at wide open throttle (WOT) speed. Extended operation above 4000 ft, or after carburetor rebuild,requires readjustment of idle screw and mixture needles to insure the engine continues to comply withC.A.R.B, and E.P.A, emission regulations.Carburetor adjustment screw driver 2.5 mm flat tip, Limiter cap removal tool, Electronic digitaltachometer with sensitivity capable to within 10 RPM increments, and Two (2) Limiter caps.WARNING!!! DANGER!!!Always operate unit in a well ventilated and clear work area. Keep hands clear of the cuttingblades during adjustment otherwise serious bodily injury may occur.2. PRE - ADJUSTMENT CHECK LISTIMPORTANT: Before performing carburetor adjustment, the following areas must be inspectedand in good working order.● Correct spark plug set to specified gap must be used.Spark Plug: NGK-CMR7H Gap:● Standard cutting blades must be installed properly.0.026 inch (0.65 mm)● The air filter must be clean and properly installed.● The carburetor and carburetor insulator block screws must be tight.● The fuel filter must be clean and properly installed.● The muffler spark arrestor screen and exhaust port must be clearof carbon.● The fuel must be fresh (> 89 Octane or higher: RON+MON/ 2) andproperly mixed at 50:1 ratio with RedMax or (ISO-L-EGD/ JASOFD) registered 2-stroke oil.0.026 in（0.65 mm）Cutting Blades

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