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Old 20 November 2011, 16:30   #11
Country: UK - England
Town: Plymouth
Length: 6m +
Join Date: Mar 2011
Posts: 2,693
Originally Posted by sburt10
The merc shafts are a little over 20"

The transom is approx 20"

The only other options are to go for a short shaft at 15" (approx)
Won't get a short shaft 90hp

Long shafts are 21,

Peter ~ Boatsandoutboards4sale ~ ~ 07930 421007

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Old 20 November 2011, 17:30   #12
Country: UK - England
Town: Gloucestershire
Boat name: Osprey
Make: Osprey Vipermax
Length: 5m +
Engine: E-tec 300 G2
Join Date: Dec 2006
Posts: 4,008
Originally Posted by sburt10 View Post
No, its not an XL shaft guys.
if its a 20" transom and a 20 or 21" leg then how can it be hanging 3" below?

Chris Stevens

Born fiddler
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Old 21 November 2011, 02:45   #13
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Country: UK - England
Town: Southampton
Boat name: Hissing Sid
Make: Ross Smith Cobra
Length: 6m +
Engine: 200HP Optimax
MMSI: 235038046
Join Date: Jun 2002
Posts: 3,803
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Old 21 November 2011, 03:34   #14
Country: UK - Scotland
Town: Glasgow
Boat name: Baby B
Length: 5m +
Engine: Evinrude
Join Date: Aug 2011
Posts: 30
Guys, give me a break here, I did not have a measuring tape when we took the boat out of the water, lets say its 2" under to allow us to progress this conversation.
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Old 21 November 2011, 03:53   #15
Country: UK - England
Boat name: Scorpion
Make: Avon
Length: 5m +
Engine: Mercury 90HP 4stroke
Join Date: Oct 2011
Posts: 43

I guess I may be stating the obvious here but without seeing it is hard for anyone to assess exactly what the problem is. If it was bought as a new package I would get straight back to where it came from! A dealer should know what engines suit which boats and they may have sold you an incompatible partnership! Otherwise I would suggest the easiest solution may be to get it along to an experienced marine engineer at your local boatyard to look at it and he may possibly need to take it out for a sea trial.
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Old 21 November 2011, 06:24   #16
Country: Ireland
Town: Castlebar
Boat name: Clewless
Make: Valiant DR 490
Length: 4m +
Engine: 60 hp ETEC
MMSI: Awaitng one
Join Date: Oct 2007
Posts: 1,117
What make is the rib? and how is it set up wrt seating. How many on board?
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Old 22 November 2011, 07:24   #17
Country: UK - Scotland
Town: Glasgow
Boat name: snagglepuss
Make: Shetland
Length: 6m +
Engine: 90 hp Outboard
Join Date: Nov 2011
Posts: 562

you could take the easy option and bring it down to us or depending where you are in Glasgow I could pop down as I live near the fort shopping centre.

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Old 22 November 2011, 07:53   #18
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Country: USA
Town: Connecticut
Make: Zodiac
Length: 5m +
Engine: 75hp ETEC
Join Date: Nov 2009
Posts: 461
engine issues

When I mounted my new engine on my Zodiac I had the same issue. The boat was rated for an engine with a 20" shaft so that is what i ordered. The transom was actually a little short, around 19" and the motor a little long, actually 22" so between the two there was a bit of an issue. This is really not all that uncommon. I jacked my engine up three holes and the water spray went away and performace got better. My cavitation plate is now a hair plus or minus above the bottom of the boat.
Unfortunately there is no law on actual produced lengths at least not in the US on transoms or engines so you will find variances. I've found brand 20" shaft engines with measurements anywhere from 18.5" to just over 22".
Best of luck with it !
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Old 23 November 2011, 05:50   #19
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,538
Other thing to check - the trim of the engine.

If it's PT, did you motor it all the way down & leave it there? Yopu will very likely need to wind it back up a bit once on the plane. Most Rib transoms aren't perfectly vertical. You may find it's in line if you wind the trim back out a bit. I have my "trim pin" three holes up to stop me accidentally trimming too far in (which causes spray like that).
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Old 30 November 2011, 15:30   #20
Country: USA
Town: Anchorage
Boat name: Big Red
Make: Achilles
Length: 4m +
Engine: Tohatsu 50
Join Date: Nov 2011
Posts: 26
I would say raise it up a hole or two. Id shoot for somewhere in the 1/2" to 1 1/4" below keel.

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