my 80 hp 4 stoke yamy
Submitted by petermac on Thu, 2014-04-17 21:00
on a glassed of day I can get 6500 rpm out of my yamy I don't think I should be able to pull those rpm am I under or over propped , I also suffer from cavitation if I nail it from zero to flat out
iana
Posts: 652
Date Joined: 21/09/09
Recommended Max RPM 5500-6000
Recommended Max RPM 5500-6000, slightly under propped.
outdoinit
Posts: 1009
Date Joined: 05/10/12
+ 1
slightly under propped
I've spent half my life fishing.. The other half I have wasted..
Doooma
Posts: 791
Date Joined: 05/12/09
I have a 60hp yami four
I have a 60hp yami four stroke and only pulling around 5000..
Paul H
Posts: 2104
Date Joined: 18/01/07
My 70 pulls 5900 (5800-6300)
My 70 pulls 5900 (5800-6300) on 70 so spot on. 6500 on 80 is under propped either change prop or dont pull those revs - wouldn't be good for the motor.
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Jason P
Posts: 521
Date Joined: 16/02/13
My 100 Yamaha used to run a
My 100 Yamaha used to run a 17 pitch at 6200 (std yamaha ali)about 58 kph, then went to a 19 which brought the rpm down to about 5800 and 62 kph (std yamaha ali) then broke that to went for a aftermarket ali prop in a mercury style lobed blade in a 19 as well and now get max rpm of 5500 and 64 kph also seems to have better take off and control than the yamaha props. I didn't go to a stainless steel prop as cost and would rather sacrifice prop than gearbox but people do have different opinions between ali vs ss.
DM306