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Old 17 March 2018, 15:22   #1
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Country: UK - England
Town: barnsley
Make: excel
Length: 3m +
Engine: 15 hp ob
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Posts: 24
9.9hp mercury

Hi everyone just got another boat after a few years its a 3 year old zodiac 310
with a 3 year old 9.9hp mercury four stroke std shaft I have been told the only difference between a 9.9 and a 15 is the carb or carb jets can anyone confirm this.
And if it is correct what it entails to convert to a 15
Regards
johnyp
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Old 17 March 2018, 17:47   #2
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Country: UK - England
Town: East Anglia
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Mariner 9.9 4-stroke
Join Date: Nov 2007
Posts: 4,258
Assuming your motor is a 4-stroke not a hookey 2-stroke...

In your manual check your engine cc. I think around the age of yours the 8 & 9.9 were basically the same motor with a capacity of just over 200cc. The 15 & 20 were then similar motors based on the 323cc (or thereabouts) powerhead.
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Old 18 March 2018, 05:58   #3
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Country: UK - England
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9.9

thanks I will dig out he manual and have a look
regards
johnyp
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Old 18 March 2018, 06:51   #4
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Country: UK - England
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9.9 mercury 4 sroke

hi yes it is a 209cc so looks like its not doable to upgrade to 15 hp
thanks
johnyp
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Old 18 March 2018, 07:12   #5
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Country: UK - England
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Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Mariner 9.9 4-stroke
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Posts: 4,258
As long as you don't carry a heavy load a 9.9 should be fine on a 310.
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Old 18 March 2018, 07:24   #6
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Country: UK - England
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9.9 mercury 4 sroke

that's the problem I am approx. 14 stone but my mate is approx. 18 stone lol
and then all the gear I think I will have to leave him at home ah
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Old 18 March 2018, 08:23   #7
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Country: UK - England
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Join Date: Nov 2007
Posts: 4,258
All SIB and OB combos perform slightly differently but my experience with 10hp on 3.1/3.4m SIBs has been they will plane fine with two adults total 28 stone (plus fuel and kit)... or one adult and two children total 28-30 stone. Once we tried two adults and one child getting up to 35 stone it became harder to plane.
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Old 18 March 2018, 08:33   #8
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Country: UK - England
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Posts: 24
I know I think maybe next year I will upgrade to a bigger boat and engine not sure to get air floor or ally
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