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Old 14 April 2009, 19:44   #1
abc
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Country: UK - England
Town: Gt Yarmouth
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Make: Avon
Length: 5m +
Engine: OB 90 HP
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Optimax 90 HP outboard.
I am thinking of putting one on a 5.6 m Avon for diving use.
Are they reliable and as fuel efficient as the blurb says?
Any opinions, good or bad, gratefully received.

abc
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Old 15 April 2009, 12:02   #2
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Country: UK - England
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Engine: 50Yam/25 Mariner
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I was always a bit of 4 stoke fan till I got a boat with an opti fitted. I love it now - yes I had some minor electrical problems ( not the engine I stress ) with the battery and understand they can be 'a bit' sensitive to having enough volts to crank & spark up properly. Thats waht I was told by a couple of poeple but not sure what ' a bit' really means ! I have a 200 that pushes a heavy 7.5m boat along at 50knts WOT & if driven sensibly gives a fraction over 1lt a mile ( around 25-30 knts ish), and doesn't use much oil, doesn't smoke & is not overly noisy for a bigish engine.

The only minor thing I would say if is at lowish revs when I'm forced to go slow mines pops abit - maybe due to being the V6 ? Not a problem as such - just make me think I have broken it or its about to stop ( its not ever done either ).
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Old 15 April 2009, 13:00   #3
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Agree with the above, I have a 115 on a 5.8m and it will do 40kts and at around 25kts do 1.8miles/ltr.

A great noise and only use about 7 litres of oil over a season of about 80+ hours of use.

It does not "like" long periods of running at sub-planning speeds, as the temp rises but stays below any dangerous temps. Therefore there is always an excuse to open her up and enjoy.
Regards
Steve
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Old 15 April 2009, 20:40   #4
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I'd get the 115 opti over the 90. Same weight, same CC...
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Old 15 April 2009, 21:17   #5
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Country: UK - England
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Boat name: True Blue
Make: Humber ocean pro 6.3
Length: 6m +
Engine: Mercury 150 opti
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Quote:
Originally Posted by Nos4r2 View Post
I'd get the 115 opti over the 90. Same weight, same CC...
And based on next week new optimax prices, only a £1,500 extra price tag

But as luck would have it. I just happen to have one left at the old price.

Would a 5.4 SR be rated to take a 115?
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Old 15 April 2009, 21:26   #6
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Country: UK - England
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Make: PBS humber 5.5
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Engine: 115 optimax!!
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Very happy with my 115 opti, runs smooth, good on fuel and a 5 yr warranty
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Old 15 April 2009, 21:40   #7
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Quote:
Originally Posted by Ian Sharlot View Post
Would a 5.4 SR be rated to take a 115?
No, but abc is looking for a motor for a 5.6 Avon. If it's a 5.60 Adventure, then it's rated to 115hp.
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Old 15 April 2009, 21:43   #8
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Quote:
Originally Posted by Downhilldai View Post
No, but abc is looking for a motor for a 5.6 Avon. If it's a 5.60 Adventure, then it's rated to 115hp.
My mistake, I misread that bit
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