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Author Topic:   Suzuki/Johnson 140hp 4-stroke on '89 18 Outrage
Tom2697 posted 04-01-2003 05:24 PM ET (US)   Profile for Tom2697   Send Email to Tom2697  
Has anyone tried this combination before? Will it perform much differently from the '89 150hp Evinrude I have? (ie - holeshot and top end)
toni posted 04-01-2003 06:22 PM ET (US)     Profile for toni  Send Email to toni     
I went from twin 150 Johnsons to twin 140 suzuki.(23' walkaround) Top end seems to be a couple mph less and I have to run at a little higher RPM to maintain the same speed as before. Overall performance seems good.


Bigshot posted 04-02-2003 09:52 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Holeshot and top end will suffer some but MPG should about double.
andygere posted 04-02-2003 10:50 AM ET (US)     Profile for andygere  Send Email to andygere     
I believe that Dan Firth (Cruz Control, Cetacea Page 16)is running this setup on his Outrage 18. You may want to look him up and send him an e-mail.
hauptjm posted 04-02-2003 11:07 AM ET (US)     Profile for hauptjm    
My buddy has an early 90's two-stroke 140 Suzuki/18 Outrage combo. I've run with him many times and the hole shot and top end is much less. His fuel economy is slightly better, but I don't think it's great enough to compensate for the lack of power. A four-stroke will give you much better economy, but at even more of a performance deficit. I wouldn't discourage you from the rig if absolute performance isn't paramount.

p.s. I run a 1995 Johnson 150.

Tom2697 posted 04-07-2003 01:54 PM ET (US)     Profile for Tom2697  Send Email to Tom2697     
Thanks all. I decided that I wanted better efficiency so I went with this engine. Hole shot is a little slower (as expected) but I also never replaced the Dowl-fin that I had on. I will be curious to see how it performs if I decide to install it. Top end was 36 mph at 5200 rpm....I obviously need to re-prop. However, during the break-in period, I ran 60 miles and only burned 10 gallons! I hope this won't change after correcting the prop issue.

Thanks again!

Bigshot posted 04-07-2003 03:01 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Probably get better. What size prop are you running? I would want that to spin at least 5800 wot with light load. I believe redline is 6100 right?
Bigshot posted 04-07-2003 03:02 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Ps make sure throttle is fully opened at WOT(linkage). If holeshot is good your linkage may not be set up right, you can check that yourself.
Tom2697 posted 04-08-2003 09:53 AM ET (US)     Profile for Tom2697  Send Email to Tom2697     
Prop is an 18" pitch with a double cup on it (used a lot down here in S. Texas on tunnel-hulled flats boats). The dealer and a prop shop are both recommending I go with a 17" uncupped prop.
lhg posted 04-08-2003 04:10 PM ET (US)     Profile for lhg    
Un-cupped props are completely obsolete and not recommended at all. Mercury has not made uncupped props, any line, since about 1975.
Cupping improves both holding and acceleration, since cupping effectively increases pitch by two inches. For instance, a 19" cupped prop will hold the same throttle rpms as a 21" uncupped prop, but the lower pitch allows it to accelerate faster.
Perry posted 04-08-2003 06:37 PM ET (US)     Profile for Perry  Send Email to Perry     
I have a stainless steel Solas Saturn prop that isn't cupped. I also own cupped props. The solas out accelerates all of them and gets the same top speed as the Rapture (same pitch). This Solas is the best all around prop I own.
Bigshot posted 04-09-2003 09:14 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
depending on setup, uncupped(which still has a little cup will work better due to slip, kinda like a stall converter.
sternman posted 04-14-2003 11:41 PM ET (US)     Profile for sternman  Send Email to sternman     
I had an 89 Evinrude 140 on my 89 Outrage 18 for 11 years and repowered with a Honda 130 in 2000.Hole shot is a little slower but top end is a little faster and fuel consumption is about 50% less with the 4 stroke.The Suzuki should do at least as well,probably a litle better than the Honda.I'll never own another 2 stroke.

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