2005 Johnson 25 30 hp PL4 4-Stroke Outboard Owners Manual

INSTALLATION
Use this procedure to determine whether or not the
boat’s  transom  height  is  correct  for  the  engine’s
shaft length:
WARNING
Set the motor on the boat’s transom and adjust the
angle so the anti-ventilation plate is parallel with the
boat bottom. Refer to Power Trim and Tilt.
Your engine must not exceed the maximum
horsepower indicated on the boat’s capacity
plate. Such overpowering can cause loss of
control.  Contact  your  Dealer  or  the  boat’s
manufacturer if your   boat lacks a  capacity
plate.
Boats designed for remote-steered engines
might  be  overpowered   by  a  tiller-steered
engine  of  the  maximum  rated  horsepower.
Ask your Dealer or boat manufacturer if you
are unsure about your boat’s suitability.
Incorrectly  matched  boat  and  engine  tran-
som heights can cause boat instability and
loss of control. Refer to Transom Height and
Shaft Length.
Prevent   lateral   movement   and   possible
engine  loss  by  using  the  mounting  hard-
ware supplied or hardware of sufficient size,
strength, and  quality. Refer to  Installing the
Engine.
The  resulting position of  the  anti-ventilation  plate
must be 0 to 1 in. (0 to 25 mm) below the boat’s bot-
tom.
IMPORTANT: If the anti-ventilation plate falls out-
side the 0 to 1 in. (0 to 25 mm) range, the installa-
tion  is  not  considered  normal.  The  motor   shaft
length must be changed or the boat’s transom must
be modified.
Lower  than  recommended  –  serious  powerhead
damage could result from water entry into the lower
engine cover or overloading from an under-revving
propeller at wide open throttle.
A mounting  surface that is  damaged or  too
thin to support  your engine while underway
might fail  during operation,  causing  you to
lose control.  Be sure the  boat’s transom  or
mounting bracket is structurally sound and
between 1 5/8 in. (41 mm) and 2 3/4 in. (70
mm) in thickness.
Higher  than  recommended  –  serious  powerhead
damage could result from inadequate cooling or an
over-revving  propeller.  Propeller  ventilation  (slip-
page) often occurs, resulting in poor boat perfor-
mance.
On a specialty hull, non-planing hull,   or on a  boat
with a curved transom, these guidelines might not
apply. See your Dealer for special installation infor-
mation.
TRANSOM HEIGHT AND SHAFT
LENGTH
The  transom  height  dimension  listed  in   Engine
Specifications, is the height of the boat transom
your engine needs. This dimension is measured at
the transom centerline, perpendicular to the bottom
of the boat.
1.
2.
3.
Transom Height
Anti-ventilation Plate
Final position - 0 to 1 in. (0 to 25 mm)
Installation - 47
Product Specification
CategoriesBRP Brand Manuals, Johnson 4-Stroke Manuals, Johnson Brand Manuals, Johnson Outboard Manuals
Tags, ,
Model Year2005
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