Yamaha F25B, T25B q we, PROPELLER SELECTION

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EMU01395

			PROPELLER SELECTION
			The performance of your outboard motor
			will be critically affected by your choice of
			propeller, as an incorrect choice could
			adversely affect performance and could
			also seriously damage the motor. Engine
			speed depends on the propeller size and
			boat load. If engine speed is too high or
			too low for good engine performance,
			this will have an adverse effect on the
			engine.
			Yamaha outboard motors are fitted with
			propellers chosen to perform well over a
			range of applications, but there may be
			uses where a propeller with a different
			pitch would be more appropriate. For a
			greater operating load, a smaller-pitch
			propeller is more suitable as it enables
			the correct engine speed to be main-
	12-1/4 x 9 - G		tained. Conversely, a larger-pitch pro-
			peller is more suitable for a smaller oper-
	q we
			ating load.
			Yamaha dealers stock a range of pro-
			pellers, and can advise you and install a
			propeller on your outboard that is best
			suited to your application.
000601			NOTE:
			At full throttle and under a maximum
			boat load, the engine’s rpm should be
			within the upper half of the full throttle
10-3/4x17-F			operating range, as listed in “SPECIFICA-
			TIONS” on page 4-1. Select a propeller
1 23
			which fulfills this requirement.
			If operating under conditions which allow
			the engine’s rpm to rise above the maxi-
			mum recommended range (such as light
602016			boat loads), reduce the throttle setting to
			maintain the rpm in the proper operating
			range.
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