MODEL AQ, AQSHO SERIES
ASSEMBLY INSTRUCTIONS
YAMAHA 200-250 HP, V6, 2 STROKE, 3.1 L
200-250 HP, V6, 4 STROKE, 4.2 L
3
MAINTENANCE AND LUBRICATION
See last page.
CAUTION
V4 and V6 Drives
It is important on high HP installations to mount the motor at the correct height and t o use the power tilt
properly.
Power tilt is convenient for drifting and when operating at low throttle in very shallow area. When under power
however, the engine should not be tilted out in an effort to gain speed as is done with propellers.
The engine driveshaft should be vertical when planing or tilted toward the boat in order to provide a scooping
angle on the water intake grill. Tilting the motor out beyond a vertical position reduces the scoop angle and can
cause impeller slippage and cavitation burns on the impeller blades.
When running in a bay, lake or wide river in windy conditions, particularly when running with the wind the jet
can suck in air when jumping across the wave crests. This will result in overspeeding and causes sever strain on
the driveshaft when the engine is suddenly brought back to normal speed as the impeller once again grabs solid
water.
If your boat is used frequently under these conditions, the engine height should be set lower than normal to
minimize overspeeding. Running at reduced throttle will help when winds are strong. You can also experiment
with a plate extending from the hull bottom to the top of the leading edge of the water intake as shown in
paragraph 7 of the owner’s manual. This tends to reduce air intake as well as to reduce spray.
A water intake fin kit, part # 1726 will soon be available. The purpose of these fins is to ram more water into
the intake and to shield the forward sides of the intake from the entrance of air. There is a noticeable reduction
of engine overspeeding when running with the wind on a heavy chop. To a lesser degree, the fins provide some
rudder effect when operating at low speeds. This is not a cure all for cavitation and it is still necessary to set the
engine height and angle properly and to minimize obstructions or imperfections in the hull ahead of the intake.
GOOD BOATING AND HAVE FUN!
Specialty Manufacturing Company
Outboard
Jets
2035 Edison Avenue
San Leandro, CA 94577
