WHat motor should I buy please share

judah304

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Aug 16, 2001
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15
If you had to chose between a 1988 evinrude 50hp twin and a 1976 johnson 70hp 3cyl which would you buy and why. I have a 17ft MFG. Pretty light boat. I want to be able to pull a tube will the 50hp do it? PLease give me suggestions.
 

JB

Honorary Moderator Emeritus
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Mar 25, 2001
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Re: WHat motor should I buy please share

For that boat I think I would go for the 70, judah.<br /><br />Good luck. :)
 

chris in va

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May 4, 2003
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Re: WHat motor should I buy please share

The 76 still has points. Go with the 88.
 

ledgefinder

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May 2, 2002
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Re: WHat motor should I buy please share

The 76 has a self-energized, sensor-powerpack system. The last triple with points was 1971. <br /><br />The 50 twins were pretty wimpy when they first came out. I've had a 1971 & a 1974 and neither had any bottom-end power. By 1988, OMC may have gotten them squared away - anybody owned a newer one who can comment? <br /><br />Unless the 50s got stronger, I'd be leery of trying to ski or tube on a 17-footer. If you do run it, make sure you prop it right - it wants to rev high.<br /><br />The 70s are a good motor. What kind of shape is it in?<br /><br />Either motor, you want to check the compression before you buy. Ideally, you want to run it on the lake for 20 minutes or so, and get a 30 day return. Check the fluid in the lower unit AFTER the lake test. Clean the carbs & put a new impeller in it unless you're sure it's just been done.<br /><br />What happened to just running that old 60hp? If you find and fix the cause of the seizure, run the first tank of gas through it at 32/1. That should smooth out the rough spots, and it may keep running for a while. Plan on picking up another motor in October when they're cheap. I keep an old Homelite XL-12 chainsaw for a backup. It seized on straight gas 15 years ago, still runs fine & puts out decent power, though it has maybe 50% the compression it had new.<br /><br />Good luck, either way.
 

judah304

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Aug 16, 2001
Messages
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Re: WHat motor should I buy please share

Ledgefinder youve been a big help. I feel like I just keep throwing money at this gas guzzling 60hp motor that I can't tow tube with anyway. I just want a boat I can put gas in it and go fishing and not have to be constantly fixing it.
 

angus63

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May 20, 2002
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Re: WHat motor should I buy please share

I believe what your lookin' for is called "a friend's boat"!!!! ;) ;)
 
D

DJ

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Re: WHat motor should I buy please share

The 70 will do great. The trick is to NOT overprop it.<br /><br />You want it to be able to turn 6K RPM with a light load.<br /><br />I would start with a 13-1/4" X 15" prop.
 

Motor Boater Bill

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Jan 29, 2005
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Re: WHat motor should I buy please share

"I keep an old Homelite XL-12 chainsaw for a backup. It seized on straight gas 15 years ago, still runs fine & puts out decent power, though it has maybe 50% the compression it had new."<br /><br />Hey Ledgefinder,<br />What size prop do you run on that chainsaw and will it get up on plane with 3 guys in the boat?
 

Cricket Too

Lieutenant Commander
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May 14, 2003
Messages
1,732
Re: WHat motor should I buy please share

judah....Yeah I have a rebuilt 1975 70hp and it does not have points, runs great and plenty of hole shot and WOT RPM with a 15 pitch prop on a 17' Sport Craft CC.<br /><br />Good one angus, but depending on how good of a friend owns that boat, their troubles usually become yours, more than half of my experiences have been on stuff I don't even own.
 

kirkland

Petty Officer 2nd Class
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Jun 2, 2003
Messages
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Re: WHat motor should I buy please share

i've had both a 89 50hp johnson and now have 91 70hp rude ,,,big difference in boat attitude...i wouldn't go back.. just my $0.02
 

judah304

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Aug 16, 2001
Messages
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Re: WHat motor should I buy please share

Well the guy selling emailed me back and said it has 118 psi on all three cylinders. No tilt/trim but I didn't have that on the old boat. I believe the motor has been sitting for a while. What should I plan on beside carbs,water pump, lower unit oil change and plugs? Thanks guys
 
D

DJ

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Re: WHat motor should I buy please share

You've got it covered.
 

OBJ

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Dec 27, 2002
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10,161
Re: WHat motor should I buy please share

Well...OK....here's my nickels worth....I got an 84' 50hp. Used to run it on my 16ft. StarCraft SuperSport before I came across a 90hp Johnny. Now the 50 is on my toon.<br /><br />Granted my StarCraft is 16ft and aluminum and is probably a lot lighter than the MFG. But that little 50 would shove that SC up to 30mph. Pulled tubes and what not with not even a hiccup. She is still going strong on the toon. I'll probably take a beating for this....but....I'd have to go with the 50....lot newer, CD ignition and a breeze to work on.<br /><br />Course....I may be biased in my comments.... :D
 

ledgefinder

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Re: WHat motor should I buy please share

Actually, you'd know a lot better than me, OBJ - that's why I asked. I've only had a couple of the real early 40 cubic inch ones.<br /><br />OBJ knows his stuff, I suspect that 50 would do fine, particularly as it's newer motor.
 

McGR

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Jun 19, 2004
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Re: WHat motor should I buy please share

I used to have an '89 40hp on my 17' Sea Nymph GLS175. When I bought the boat I felt it may be somewhat underpowered but it was a deal I couldn't pass up (boat & motor for $1200). Surprisingly, the 40 did much better than I thought it would. On a good day it would hit about 27mph (GPS). I also would pull my kids on a tube with it - no problem. Granted, the oldest was 10 then. Nonetheless, it handeled the task. So, while the 3 cyl would probably perform best, I wouldn't necessarily rule out the twin. Heck, many moons ago I learned to ski behind a 40hp.
 

OBJ

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Dec 27, 2002
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Re: WHat motor should I buy please share

Well ledgefinder...again I'm just biased I guess. They both are loopers and the 70's are strong runners. I would also think that maybe someday when a trade in is needed, maybe the 50 would fetch a little more 'cause of it's age? In any event, he'll be getting a John/Rude....I don't think he could do better......sorry....just me being biased again :D
 
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