RedMax HTZ 2401 Service Bulletin

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EMISSIONS SERVICE BULLETIN
To:
Subject:
Emissions Carburetor: Walbro-Model: WYA- 67A - PART # 848-F0G-8101 (511354201)
PRODUCT MODEL
Hedge Trimmer:
HTZ 2401(L)/ HTZ 2460(L)
CHTZ 2401(L)/ CHTZ 2460(L)
The carburetors on the listed model have been factory preset to C.A.R.B. Tier III and E.P.A Phase II
emissions 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 with
emission regulations. The Low-speed Fuel mixture needle adjustment controls the Fuel/ Air mixture at
idle and mid-range engine speeds. The High-speed Fuel mixture needle
mixture 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 with
C.A.R.B, and E.P.A, emission regulations.

1. REQUIRED TOOLS

Carburetor adjustment screw driver 2.5 mm flat tip, Limiter cap removal tool, Electronic digital
tachometer 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 cutting
blades during adjustment otherwise serious bodily injury may occur.

2. PRE - ADJUSTMENT CHECK LIST

IMPORTANT: Before performing carburetor adjustment, the following areas must be inspected
and 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.
● 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 clear
of carbon.
● The fuel must be fresh (> 89 Octane or higher: RON+MON/ 2) and
properly mixed at 50:1 ratio with RedMax or (ISO-L-EGD/ JASO
FD) registered 2-stroke oil
All RedMax Distributors and Dealers
Emission Carburetor: Low Speed/ High Speed Mixture Needle and
Altitude Adjustment Procedures
From:
All units listed with above carburetor models.
0.026 inch (0.65 mm)
.
ENGINE SERIAL NUMBER
adjustment controls the Fuel/Air
0.026 in
（0.65 mm）
Cutting Blades
Ref No. 10-01-R2
Issued in: Nov. 2010