wot for 74 85hp johnson

[chad lester]

Hello all just wondering if anyone could tell me the wot rpm's on a 1974v4 85hp johnson? The tag on the motor says 85hp@5000 rpm's was just wondering if this was wot or if it was 5500 like other outboards I have owned.

 

[iwombat]

Re: wot for 74 85hp johnson

5500 or higher. Actually, 5800 is probably what you should target.

 

[tashasdaddy]

Re: wot for 74 85hp johnson

the reason being the lousy gas we have today, compared to them.

 

[ezeke]

Re: wot for 74 85hp johnson

5000 RPM is the RPM at which the motor was rated at 85HP.

In the factory manuals the specifications will say "Horsepower (B.I.A. -certified.........85 hp at 5000 rpm" and, "Full throttle operating range...........4500 to 5500 RPM"

As iwombat said, you will want to prop the motor to peak at 5800 RPM at WOT.

 

[chad lester]

Re: wot for 74 85hp johnson

Thank's for all the reply, but was just wondering if anyone knew if it has 85hp @5000 then what would be the actual @5500-58000, and what would be a safe wot rpm for this motor I mean if I run it in the high range is it more likely to blow something or is that just the redline so to speak????

 

[chad lester]

Re: wot for 74 85hp johnson

sorry but one more thing I think the motor may be too low in the water! How far should the anti cavitation plate be below the bottom of boat? It is currently on a 15 yankee tri-hull about two inches bellow bottom of boat.

 

[iwombat]

Re: wot for 74 85hp johnson

Should be 1"-2" above the keel. Just to start you out - keep raising it on the transom until it starts to cavitate in the corners, then go down a notch.