RedMax HTZ 2401 Service Bulletin

2/4 Page EMISSIONS SERVICE BULLETIN Ref No. 10-01-R2Issued in: Nov. 20103. Carburetor Adjustment WITH limiter caps INSTALLED1. Start and run engine for 3.5 minutes alternating RPMbetween, Wide Open Throttle (WOT) for 1 minute and Idlefor 10 seconds.2. Adjust idle speed throttle valve screw (A) to 3000 RPM +/-200 RPM. Unit should Idle at 2800-3200 RPM. The W.O.T.(Wide Open Throttle) should be at 9000-10700 RPM.If engine does not run correctly after idle adjustment, followguidelines for “4.Carburetor Adjustment WITH limiter capsREMOVED”.4. Carburetor Adjustment WITH limiter caps REMOVEDLow and High Speed Limiter Cap RemovalNOTE (CHTZ models): Take a carburetor off an engine whenremoval of Limiter Caps and any Initial Start Settings.1. Screw Limiter cap removal tool counterclockwise (CCW) 2 turnsinto Low (B) and High speed mixture needle (C) limiter caps.2. Pull limiter caps out from, both Low and High speed mixture needleholes.NOTE: If cap is damaged and stays in the hole, use pick typetool to remove.■Initial Start Settings, if original needle settingswere NOT1.Turn throttle valve adjust screw (A)disturbedIN2.Turn Low speed mixture needle (B) OUT counterclockwise (CCW)1/8 turns.clockwise (CW) ONE and onehalf (1-1/2) turns.■Initial Start Settings, if original settings WERE1. Turn throttle valve adjust screw (A) counterclockwise (CCW) until itstip just touches throttle plate stop. Then turn the screw in clockwise(CW) Six and one half (6-1/2) turns.disturbed2. Turn High speed mixture needle (C) clockwise (CW) until verygently seated3. Turn Low speed mixture needle (B) counterclockwise (CCW)completely out until a clicking sound is heard. Then turn it inclockwise (CW) Ten and one half (10-1/2) turns., then come out counterclockwise (CCW) 2-1/4 Turns.NOTE (CHTZ models): Insert new limiter cap in the High-speedmixture needle hole then set a carburetor on an engine.4. START ENGINE USING WIDE OPEN THROTTLE5. If engine idles andto prevent sparkplug fouling.does not6. If enginedie out at idle, continue to the warm upprocedure and “Low Speed Mixture Needle Adjustment” on Page 3.Does Not Idle and Dies Out at idle, turn Low speedmixture needle (B) in clockwise (CW) 1/8 turn. Again STARTENGINE USING WIDE OPEN THROTTLERepeat step 6 until steady idle is obtained before moving to “LowSpeed Mixture Needle Adjustment” procedure on Page 3.and confirm idlecondition.NOTE: The initial carburetor settings for throttle valve idle speed adjust screw, Low speedmixture, and High speed mixture needles are intended to start and run the engine before finalcarburetor adjustments are made. Actual turns required for starting engine may vary slightly.Low Speed Mixture Needle (B)Idle Speed Throttle Valve Screw (A)High-speed needle (C)Low-SpeedNeedle (B)Idle speedthrottle valve screw (A)(B)Limiter CapLimiter Cap Tool

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