Mercury 15 TwoStroke, Operation, Maintenance & Installation Manual

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NOTE: Do not mix different brands of oil. The mixing of different brands, or
different kinds even if the same brand, may cause gelling, resulting in blockage
of filter screens. This may lead to serious engine damage due to the lack of
lubrication.
Mixing ratio (1:50): Mercury or Quicksilver engine oil or recommended engine
oil (TC‑W3), 1:Unleaded gasoline 50.
ENGINE BREAK-IN FUEL MIXTURE
Use a 1:25 oil/gasoline mixture in the first tank of fuel. Use Mercury or
Quicksilver engine oil or the recommended oil (TC‑W3).
BREAK-IN
Break
‑
in period for 10 hours
Vary the throttle setting during the first hour of operation.
During the first hour of operation, avoid remaining at a constant speed for more
than two minutes and avoid sustained wide‑open throttle.
Time 0–9 min.
10–59
min.
1:00–1:59
hrs.
2:00–9:59
hrs.
10 hrs.
Method of
operation
Idling or
trolling
Throttle
open
less than
½ of the
way
(about
3000
RPM)
Throttle open
less than 3/4
of the way
(about 4000
RPM)
Throttle open
3/4 of the
way (about
4000 RPM)
Normal
operating
Conditions
Cruising at
no more
than
minimum
speed
A full‑throttle
run is allowed
for 1 min.
every 10 min.
A full‑throttle
run is
allowed for 2
min. every 10
min.
Warming Up the Engine
Warm the engine at low engine speeds for about three minutes. This allows the
lubrication oil to circulate to all parts of the engine. Operating the engine
without allowing it to warm up, shortens the engine life. Be sure to check that
water is coming out of the water pump indicator when warming up the engine.
OPERATION
eng
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