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Old 17 March 2018, 19:22   #1
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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
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johnyp
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Old 17 March 2018, 21:47   #2
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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, 09:58   #3
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9.9

thanks I will dig out he manual and have a look
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Old 18 March 2018, 10:51   #4
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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
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Old 18 March 2018, 11:12   #5
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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, 11:24   #6
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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, 12:23   #7
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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, 12:33   #8
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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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