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Author Topic:   Difference between 60 and 70 hp
pist2348 posted 04-22-2001 12:31 AM ET (US)   Profile for pist2348  
I am trying to find a late model used 70hp for a recently acquired 1991 15' GLS. I can only find a 60 hp. How much of a difference of speed is their between a 60 and 70 hp Johnson. Would I see more MPH out of a Mercury or Yamaha?
lhg posted 04-22-2001 09:36 PM ET (US)     Profile for lhg    
Don't know about OMC in this HP range, but I think the 3 cylinder models are better than the 2 cylinder. But, between 60 & 90 HP, I don't think there's a Yamaha made that will keep up with the same HP Mercury. Displacement on the Yamahas tends to be a little light, compared to OMC & Mercury. For your 15, the Merc 75 is a bit much unless you want a race boat, and I'd guess a good Mercury 60 will stay with a Yamaha 70. Yamaha 70 is an excellent engine however. For a 15, don't buy an OMC unless it has an integral oil injection tank under the cover. Mercury and Yamaha definitely have this feature. Considering the OMC situation, are you comfortable with a used one? Check your local parts and repair situation first.
Lil Whaler Lover posted 04-22-2001 10:21 PM ET (US)     Profile for Lil Whaler Lover  Send Email to Lil Whaler Lover     
To first focus on pist2348's question about the difference between Johnson 60 and 70 hp engines. There are 2 series of 60 hp engines, one is a two cylinder and the other a three cylinder. The twin is a dog, based on the same block as the 40 and 50 twins. The three cylinder 60 is a very nice motor, based on the 70 block. It would probably be down a couple of mph to the 70 but the twin would be down much more. Also the triple will be as strong out of the hole as the 70 but the 2 cylinder might seem quite anemic coming out of the hole. If you opt for a Johnson 60, just be sure that it is a triple!

For Larry, I agree a purchaser might want to be cautious about selecting a Johnson at this time with the changeover to "Bomb" management. Actually "Bomb" is progressing quite nicely and I just received an order form at my dealership for new OMC engines. The form listed all sizes as available (which I doubt), but the pricing was not discounted below dealer net which it should be at this time. Can't pass on savings to purchasers at the price levels offered. The buyers in our area are returning to OMC products now that factory warranty is available. Also, the only OMC engines ever offered with and integral oil injection tank under the hood are 25 and 35 horsepower triples. Absolutely great engines by the way!


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