ADJUSTMENTS
Trim Tab
Carburetor
High speed fuel calibration is maintained by the
fixed high speed jet in the carburetor. Fixed jets are
not adjustable.
Low speed fuel calibration is set at the factory with
a range of adjustment provided. If your engine dis-
plays poor running quality at low speed or idle, ask
your DEALER to perform the necessary adjust-
ments.
WARNING
Improper trim tab adjustment can cause dif-
ficult steering.
Steering Friction
A propeller will generate steering torque when the
propeller shaft is not running parallel to the water’s
surface. The trim tab is adjustable to compensate
for this steering torque.
The steering friction was set on your new motor be-
fore it left the factory. After the first 10 hours of ser-
vice, check to see that it is still correct. A slight drag
should be felt when turning the motor. If adjustment
is necessary, turn the adjustment screw:
IMPORTANT: A single trim tab adjustment will re-
lieve steering effort under only one set of speed, • Clockwise to increase friction; or
motor angle and load conditions. No single adjust-
ment can relieve steering effort under all speed,
motor angle and load conditions. If the boat pulls to
the left or right when its load is evenly distributed,
adjust the trim tab as follows:
• Counterclockwise to decrease friction.
With the motor shut OFF, loosen the trim tab
screw. If the boat pulled to the right, move the rear
of the trim tab slightly to the right. If the boat pulled
to the left, move the rear of the trim tab slightly to
the left.
1
1.
Steering friction adjustment screw
WARNING
DO NOT overtighten for “hands-off” steer-
ing. Reduced steering control could result.
Tighten the trim tab screw to a torque of 60 to 85 in.
lbs. (7 to 9 N·m).
Test the boat and, if needed, repeat the procedure
until steering effort is as equal as possible.
High motor installations — The trim tab might
be above the water when the motor is trimmed out.
Steering effort might increase. Steering effort will
be reduced if you trim the motor in and submerge
the trim tab.
Maintenance - 35
| Categories | BRP Brand Manuals, Johnson 2-Stroke Manuals, Johnson Brand Manuals, Johnson Outboard Manuals |
|---|---|
| Document Type | Boat Motor Manual. Marine Operator's Engine Guide. |
| Tags | Johnson 25 hp, Johnson 30 hp, Johnson E, Johnson EL |
| Model Year | 2004 |
| Download File |
|
| Document File Type | |
| Publisher | johnson.com |
| Wikipedia's Page | Johnson Outboards |
| Copyright | Attribution Non-commercial |
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