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Author Topic:   Outboard Horsepower Ratings c.1975
whalerron posted 12-19-2002 12:16 PM ET (US)   Profile for whalerron   Send Email to whalerron  
I have been told that in 1975, a Johnson 70 hp outboard was rated differently than outboards are rated today. What horsepower 2 stroke outboard, made today, would be equivalent to the 1975 70hp Johnson?
Bigshot posted 12-19-2002 02:14 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Well it is true they were rated at the head until 1986 or so on that particular engine. Thing is there is no real equivalent anymore. The reason I say that is theoretically you are about a 60hp in today's power ratings, maybe a 40 or 50 depending on wear but let's forget about that. The problem is if OMC still made the 60hp 3cyl it would be a great match; they do not. That 70 you have is one of the gutsiest 70's around with mucho torque, I don't think the 3-cylinder Mercury or Yamaha is comparable but your only choice. If I were to repower from a 70hp Omc and was happy with performance look at a 70 Suzuki/Johnson 4 stroke if on a 17'. If on a 15' the 60 Merc or Yamaha 2 or 4 strokes will be great.
BOB KEMMLER JR posted 12-19-2002 09:49 PM ET (US)     Profile for BOB KEMMLER JR    
Hi bigshot. It is for my now naked Rage/misfit, which I think is pretty close to a Dauntless hull, and at 1,200-lbs dry it's a porker. I'm trying to keep my new motor purchase to about $3,000. Do you think I can find a leftover motor in the 50-70hp range for that? You seem to know where the good deals are. I fish by myself a lot and I travel pretty light. While I'm sure it will be no speed demon, I think a modern 50 would be ok. What do you think? I'd like to keep the weight as close to 200-lbs as I can, so in the 70 hp range that means Yamaha or Nissan. Do you have any suggestions to the best motor in that power range? I'm looking for a two-stroke only.
whalerron posted 12-20-2002 12:02 AM ET (US)     Profile for whalerron  Send Email to whalerron     
Bigshot, that is what I had been led to believe and you confirmed it. That 70 was a 60 buy today's standards. It was a real strong engine and I don't have it any longer. It found its way to Bob and a week or so ago, it grew legs and now, it is most likely on the black market. I was asking because I want to help Bob find another motor but I wanted to be sure about what I was looking for.

Bob, you should hang a sign up that reads "To whoever stole my outboard: I have a brand new power pack for that motor that you can have if you stop by and ask." If they were stupid enough to steal the 30 year old motor, maybe they will be stupid enough to stop by.

- ron

Bigshot posted 12-20-2002 10:11 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Well...The 14 rage originally came with a 50hp Yamaha jet and she was kinda dogish. That 70 you had was about 220lbs and your boat sat pretty static. I would not be concerned with a heavier engine. Yes you can probably find a 50 leftover for $3k but Controls, etc can be very expensive. Keep trying E-Bay for deals, they are out there. Call every boat dealer/marina with 3 hours from you and see what they have. I have had very good luck with "Trade-ins" at dealers, they want them turned to cash, especially in the winter. I would look for a 90's vintage 3cyl 60 or 70 OMC since you have the controls etc. The 50 is a good engine but on a 1200lb boat....Stick with a 70.
BOB KEMMLER JR posted 12-20-2002 11:39 AM ET (US)     Profile for BOB KEMMLER JR    
I heard the 70's are'nt that good for trolling,thats why i considered the 50 2 cyl.Is this accurate or just another falsehood?I have found a "90" 70hp for $2900,and it has a one yer guarentee.So i may check that out,but i would like to know if i will havea problem with long hours of trolling.
whalerron posted 12-20-2002 12:00 PM ET (US)     Profile for whalerron  Send Email to whalerron     

the bulk of the hours on that 70 were at idle speed. I was either idling along from one crab trap to the next or I was trolling at idle speed. At idle, that motor would go about 7 hours on 6 gallons of gas and it never ever fouled a plug. I cannot imagine that motor being a problem idling for long hours.

- ron

Bigshot posted 12-20-2002 04:07 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Bob....$2900 is too steep for a 1990. I paid $1500 for a 1990 that was just rebuilt back in 1998(just the engine). Warranty was void because the shop owner just died and son was clearing out inventory. I put over 200 hours on it and sold the boat(15' BW CC). The 3cyl are pretty good at idle speeds. Not great but no 2 stroke is. The 2cyl do not foul at idle but they sure shake alot being a 2 cyl. Last year a dealer was going under and was selling new 3cyl Johnson 50's for $2800 are out there.
W E T posted 09-18-2007 07:08 PM ET (US)     Profile for W E T  Send Email to W E T     
[Changed topic to completely different line of inquiry]
jimh posted 09-19-2007 09:05 AM ET (US)     Profile for jimh  Send Email to jimh     
This is a discussion which has been dormant for five years and has now been revived to ask a question on a completely unrelated topic. This thread is closed.

To introduce new topics for discussion do not revive ones on different topics which have been dormant for five years.

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