2009 Honda 40 hp, pushing a 1650 Rebel. Seems like I don’t gain any speed from 3000rpm to 6000prm, just tops out at 23 mph. I have a 13.1 X 11 prop….I can go up to a 14.1 X 11 or a 15.1 x 11….do I need to go up to get a higher top speed, or should I look at options of going down.
You don’t want to increase the dia of the prop just increase the pitch 12 or maybe 13. but you have to watch the rpm’s on the motor. Honda should have test specs on that motor.
I hope this helps you. 
take a look here: http://www.honda-marine.com/performancetest.aspx
They have a test of a 40EFI on a 16′ Alumacraft, using a Solas 11 x 13″ pitch alum 3-blade, got 28+mph.
HRG
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