Yamaha VX250B, Owner'S Manual

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E
3-5
EMU01788
Run the engine under load (in gear with a
propeller installed) as follows.
1)
First 10 minutes:
Run the engine at the lowest possible
speed. A fast idle in neutral is best.
2) Next 50 minutes:
Do not exceed half throttle (approxi-
mately 3,000 r/min). Vary engine speed
occasionally. If you have an easy-plan-
ing boat, accelerate at full throttle onto
plane, then immediately reduce the
throttle to 3,000 r/min or less.
3) Second hour:
Accelerate at full throttle onto plane,
then reduce engine speed to three-
quarter throttle (approximately 4,000
r/min). Vary engine speed occasionally.
Run at full throttle for one minute, then
allow about 10 minutes of operation at
three-quarter throttle or less to let the
engine cool.
4) Third through tenth hours:
Avoid operating at full throttle for more
than 5 minutes at a time. Let the engine
cool between full-throttle runs. Vary
engine speed occasionally. Avoid oper-
ating the engine at 2,000 r/min and
below for more than 1 hour at a time.
5) After the first 10 hours:
Operate the engine normally. Use only
straight gasoline in the fuel tank. The oil
injection system provides proper lubri-
cation for normal operation.
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