Yamaha VX150A Owner's Manual page 70

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Flushing with the Flushing Attachment
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Avoid running the outboard at high
speed while on the flushing attachment,
or overheating could occur.
1) Remove the top cowling and silencer
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cover. Remove the propeller.
2) Install a flushing attachment to the
lower unit. (A flushing attachment is
available from a Yamaha dealer).
3) Run the engine at a fast idle for 10~15
minutes supplying water.
4) Just prior to turning off the engine,
quickly spray "Yamaha Stor-Rite
Engine Fogging Oil" (Part No. LUB-
STRRT-12-00) alternately into each
intake manifold. When properly done,
the engine will smoke excessively
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and almost stall.
5) Remove the flushing attachment and
wipe off any excess water.
6) Install the silencer cover and top
cowling. Install the propeller.
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