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Old 17 July 2015, 21:04   #1
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Country: UK - England
Town: Horley
Make: Yamaha 3.1 STI
Length: 3m +
Engine: 9.8 Tohatsu 2 stroke
Join Date: Sep 2013
Posts: 246
Yam 310 sti=confused

Just got the above sib an upgrade from my honwave, I currently have a 5 hp 2s tohatsu and was thinking of upgrading the outboard to a bigger one
The plate on the transome reads 8hp but Yamaha recommend a 9.9hp on there web site, is the plate wrong ?

Overall length
2.4 m
2.72 m
3.06 m
Beam
1.47 m
1.58 m
1.58 m
Max. Persons
3
3 + 1 (adults + child)
4
Max Engine Power
2.9 kW / 4 hp (Recommended by Yamaha)
7.3 kW / 9.9 hp (Recommended by Yamaha)
7.3 kW / 9.9 hp (Recommended by Yamaha)
No of air chambers
2 + 2
3 + 2
3 + 2
Floor material/type
V-inflatable
V-inflatable
V-inflatable
Stowed Dimensions
112 cm x 58 cm x 32 cm
112 cm x 58 cm x 32 cm
112 cm x 58 cm x 32 cm
Hull weight
25.5
32.5 kg
36.8
Max load capacity
400
500 kg
600
Max Tube Diameter
41 cm
44 cm
44 cm
Shaft Length
Short
Short
Short
I
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Old 18 July 2015, 12:29   #2
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Country: UK - England
Town: St Helens
Boat name: Wine Down
Make: Maxum
Length: 8m +
Engine: Inboard
Join Date: Apr 2012
Posts: 934
A picture of the plate would help.

Its possible that someone has switched the plate, but I doubt it.

Not sure what age it is, if its not new, did that model have a lower engine size for previous model years ?

In practical terms I can see no issues with using a 9.9hp on it, with the obvious exception of insurance issues.
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Old 18 July 2015, 13:35   #3
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Country: UK - England
Town: Horley
Make: Yamaha 3.1 STI
Length: 3m +
Engine: 9.8 Tohatsu 2 stroke
Join Date: Sep 2013
Posts: 246
It's a 2012 model
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Old 18 July 2015, 17:14   #4
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Country: UK - England
Town: St Helens
Boat name: Wine Down
Make: Maxum
Length: 8m +
Engine: Inboard
Join Date: Apr 2012
Posts: 934
The older models are have a more conservative max HP.

IMHO a 3.1m airfloor can easily take a 10hp 2 stroke. The Yam is based on the Zodiac 310 which has had a 10hp max for the last 35 years at least.

But Zodiac started to get very stingy with the max engine size from the start of the Millenium, mainly because of the increasing weight of 4 stokes.

It looks like you have a choice, find a decent 8hp to go with it (The Yamaha 2 stroke twin 8c is excellent and light) or go for a 10hp, but make sure your insurance are OK with it.
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Old 18 July 2015, 18:00   #5
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Country: UK - England
Town: Horley
Make: Yamaha 3.1 STI
Length: 3m +
Engine: 9.8 Tohatsu 2 stroke
Join Date: Sep 2013
Posts: 246
Thxs for the input, I was just confused as Yamaha recommend a 9.9hp, but not an issue as I would be very happy with a nice 8 hp yam 2 stroke if I could find one, but would happily go for a 9.8 tohatsu 2 stroke either new or a really nice second hand unit
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