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EMISSIONS SERVICE BULLETIN
Ref No. 10-01-R2
Issued in: Nov. 2010
Start and run the unit to warm up the engine. Engine must be at
operating temperature before completing Low speed mixture
and High speed mixture needle adjustments. Warm up engine
for minimum of 3.5 minutes
■
Low Speed Mixture Needle (B) Adjustment
by alternating between Wide Open
Throttle (WOT) for 1 minute, then idle for 10 seconds.
1) Set engine Idle Speed at 4500 +/- 10 RPM by turning Idle
speed throttle valve screw
2)
NOW
adjust Low speed
(A)
. The engine RPM should be stable in
the 4500 RPM range.
mixture needle
(B)
Clockwise (CW) Leaning
or Counter clockwise (CCW) Richening to reach Maximum engine
speed
AT IDLE
just before lean
3) If the idle speed at lean drop of is
HIGHER
than 4500 rpm. Adjust
Idle speed
drop off, where RPM just begins to
drop.
throttle valve screw
4)
(A)
Counterclockwise (CCW) down
500 RPM.
Repeat
step 2) and 3) as needed using 500 RPM step reduction,
until maximum lean drop of speed is reached and speed
AT IDLE
5) Turn
is
stable at 4500 +/- 10 RPM.
Low speed mixture needle
(B)
counterclockwise (CCW) in
1/8th turn increments and
Rich Down
the mixture 1400-1600 RPM
to reduce engine speed
AT IDLE
, down to 3000
NOTE: Engine speed must be allowed to stabilize a minimum of
20 seconds after each 1/8th of a turn adjustment of Low
speed
RPM.
mixture needle to assure accurate tachometer readings.
■
Checking Maximum RPM
Verifying Engine RPM Using Tachometer
NOTE:
High speed mixture needle adjustments are not required.
1) Accelerate engine to Wide Open Throttle (WOT).
2) Check the acceleration state of the engine speed, and make sure
that the engine speed is 9000 rpm or more.
3) If (WOT) engine speed is
LOWER
than 9000 RPM, turn High speed
mixture needle
(C)
clockwise (CW) 1/8 turns.
NOTE: Maximum RPM is controlled less than 10500 RPM by
speed governor in the ignition module.
4) After checking WOT RPM,
stop
the engine. To comply with the
Emission regulations, insert new limiter caps in the Low and High
speed mixture needle holes. Press new limiter caps deep into Low
speed and High speed mixture needle holes to prevent tampering.
5) Re-Start engine and verify engine Idle speed
6) Verify
range from 2800 to
3200 RPM.
Wide Open Throttle (WOT) engine speed range from 9000 to
10500 RPM, and the engine should idle and accelerate smoothly.
NOTE: If problem persists
ATTENTION !!! IMPORTANT !!!
, check carburetor for dirt, varnish,
gum, moisture and corrosion contamination
.
Carburetor adjustments with caps removed must be conducted by Authorized Emission Certified
Servicing Dealers ONLY. The dealer must supply the unit to the customer in the original
configuration, using manufacturer’s
TAMPERING is a violation of FEDERAL LAW, resulting in significant civil penalties (fines) of up to
$25,000 for each violation.
carburetor adjustment procedure, which includes having the
limiter caps in place before the unit is put into service . Knowingly removing or rendering
inoperative a device, element, or design installed on or in a non-road engine which is in
compliance with E.P.A. or C.A.R.B. regulations is classified as TAMPERING.
High-speed Needle (C)
Low-Speed
Needle (B)
Idle speed
Throttle Valve Screw (A)
New
Limiter Cap
Limiter Cap Tool
Idling
Full
Throttle
1st Time 2nd Time 3rd Time
Adjustment when engine activated
