Test Run; Break-In; After Test Run; Adjusting The Engine Idle Speed - Yamaha F2.5A Service Manual

Test run

1. Start the engine, and then check that the
gear shift operates smoothly.
2. Check the engine idle speed after the
engine has been warmed up.
3. Operate at trolling speed.
4. Run the outboard motor for one hour at
2,000 r/min or at half throttle, then for
another hour at 3,000 r/min or at 3/4
throttle.
NOTE:
The test run is part of the break-in operation.

Break-in

During the test run, perform the break-in
operation in the following three stages.
1. One hour a at 2,000 r/min or at approxi-
mately half throttle
2. One hour b at 3,000 r/min or 3/4 throttle
and one minute out of every ten at full
throttle
3. Eight hours c at any speed, however,
avoid running at full speed for more than
five minutes
0 1 2
È Hour

After test run

1. Check for water in the gear oil.
2. Check for fuel leakage in the cowling.
3. After a test run and while the engine is at
idle, flush the cooling water passage with
fresh water using the flushing kit.
69M3E11

Adjusting the engine idle speed

Adjust the idle speed after completing the
break-in period.
With the smallest engine and lowest output,
the idle speed tends to rise by the reduction
of the engine internal friction due to the
break-in.
1. Warm the engine up for 5 minutes, and
then turn it off.
2. Attach the special service tool to the
spark plug wire 1.
3. Start the engine, and then check the
engine idle speed. Adjust if out of specifi-
cation.
10
S69J1240
Predelivery checks
Digital tachometer: 90890-06760
Engine idle speed:
1,800–2,000 r/min
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