Yamaha EK40G, Service Manual

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6H95G11 1-10
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Break-in
During the test run, perform the break-in
operation in the following 5 stages.
1.
10 minutes
a
at the lowest possible
speed. A fast idle in neutral is best.
2. 50 minutes
b
at 1/2 throttle (approxi-
mately 3,000 r/min) or less. Vary engine
speed occasionally. On an easy-planing
boat, accelerate at full throttle onto plane,
then immediately reduce the throttle to
3,000 r/min or less.
3. 1 hour
c
at 3/4 throttle (approximately
4,000 r/min). Vary engine speed occa-
sionally. Run at full throttle for 1 minute,
the allow about 10 minutes of operation
at 3/4 throttle or less to let the engine
cool.
4. 8 hours
d
at any speed, but avoid oper-
ating at full throttle for more than 5 min-
utes at a time. Let the engine cool
between full-throttle runs. Vary engine
speed occasionally.
5. After the first 10hours. Use standard pre-
mix ratio of fuel and oil. Refer to page 1-
6.
å
Hours
After test run
1. Check for water in the gear oil.
2. Check for fuel leakage in the cowling.
3. Flush the cooling water passage with
fresh water using the flushing kit and with
the engine running at idle.
Predelivery checks
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