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Old 03 October 2018, 02:50   #1
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Country: UK - England
Town: Surrey
Boat name: ocean pro 6.3
Make: Humber
Length: 6m +
Engine: 140hp suzuki
Join Date: Feb 2004
Posts: 504
Engine options for Humber Ocean Pro 6.3m

Hi all,

I currently have a 6.3m Humber ocean pro from 2004. At the time itís rating was 200hp / 200kg Max. I currently have a 140hp Suzuki, also from 2004, on it weighing probably in the region of 180kg.

New ocean pros of the same model and size are rated to 200hp but the weight allowance has increased to 245kg. Contacting Humber they advised to stay to the original weight limit as the layup may have increased for the new models to take the extra weight.

Iím not looking to change the engine now ... mainly because sufficient £££ís arenít available right now, but do like the idea of increasing the hp at some stage and had liked the look of 175hp and 200hp engines, mainly to cope better when the boat is full with 4-6 people seated. I was feeling positive that I could when the funds allow make that change but cannot see what engine beyond the current 140 Suzuki that would get close to being under the 200kg weight limit. The new Yamaha 200 is 227kg so close but still over. 175s seem to be based on the larger models so still exceed 200kg. Even the 150hp Suzuki is over the weight.

Any thoughts?
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Old 03 October 2018, 03:27   #2
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Country: UK - England
Town: Surrey
Boat name: ocean pro 6.3
Make: Humber
Length: 6m +
Engine: 140hp suzuki
Join Date: Feb 2004
Posts: 504
Reply from Humber with engine weights from 2017 engines it’s not good reading, looks like 140hp is the only option to stay with until technology produces a sub 200kg engine at higher hp than 140. Or buy a newer boat at some stage... don’t particularly think it’s a good idea to go beyond the hull rating ...

140HP
Suzuki 179kg
Yamaha 174kg
Mercury no comparable model
Honda 217kg

150HP
Suzuki 236kg
Yamaha 218kg
Mercury 206kg
Honda 217kg

175HP
Suzuki 232kg
Yamaha 219kg
Mercury 231kg
Honda 270kg

200HP
Suzuki 235kg
Yamaha 221kg
Mercury 231kg
Honda 267k
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Old 03 October 2018, 03:30   #3
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mercury 150 is probably your best bet but it is still just over your limit, i think it is 202kg, check out their website. Unless humber will replate your transom (ask them?) then you may be stuck with it.

Btw don't be concerned about only going up 10hp, the merc 150 will pi$$ all over a suzuki 140 without question, that is one of the "weakest" engines for its HP on market as it is basically a stretched smaller HP motor. the good thing about it is it is light so goes on boats that have no chance of getting a 150 on it.
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Old 03 October 2018, 03:34   #4
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Country: UK - England
Town: Southampton
Boat name: SMH Rib / War Shot
Make: Ribtec / Scorpion
Length: 4m +
Engine: 10hp Yam / 150hp opt
Join Date: Sep 2003
Posts: 1,935
RIBase
The 175hp Optimax for sale on this site is less than 200kg......
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Old 03 October 2018, 04:08   #5
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Country: UK - England
Town: Surrey
Boat name: ocean pro 6.3
Make: Humber
Length: 6m +
Engine: 140hp suzuki
Join Date: Feb 2004
Posts: 504
Thanks Xk59D, yes I think you are right - definitely something to consider. Might be a couple of years until funds allow for a new motor but maybe by that time either a 150 Mercury or another motor depending on advances by the manufacturers.

Sea rider - yes I like that motor, would buy it now but don’t have the funds, just the wrong timing for me - even next summer may have been a possibility to allow for the potential price of it.
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Old 03 October 2018, 05:38   #6
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if you do exceed the weight best call insurance before you part with your cash to make sure they are happy. it isn't an uncommon thing so they may be okay with it.
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Old 03 October 2018, 07:17   #7
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Country: UK - England
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Boat name: ocean pro 6.3
Make: Humber
Length: 6m +
Engine: 140hp suzuki
Join Date: Feb 2004
Posts: 504
Agree Xk59D. Can’t see they would have a major objection as within a degree of tolerance presumably it’s not really an issue if the weight limit is exceeded slightly (within reason). In addition to the main engine plenty of things add weight to the transom, A frame, towing from U bolts and an Auxiliary which can add 50kg. Suspect, again within reason and not exceeding degree of tolerance, the main issue is the power. Of course if a very heavy engine is on the back which is way over and above the recommended weight then it will adversely affect performance and be unsafe - saw a YouTube video of a 4.5m rib somewhere abroad with a 150hp Yamaha on back, was constantly porpoising and chime walking... scary stuff!
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Old 03 October 2018, 07:29   #8
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yes i have seen the same video, was pretty pointless excersise as couldn't use any of the power, i suspect the weight was more the issue than power as it was quite an angle it was sitting at.
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Old 03 October 2018, 13:19   #9
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Quote:
Originally Posted by xpertski View Post

New ocean pros of the same model and size are rated to 200hp but the weight allowance has increased to 245kg. Contacting Humber they advised to stay to the original weight limit as the layup may have increased for the new models to take the extra weight.

Any thoughts?
That seems a bit vague coming from a manufacturer, surely they know the build spec of their boats both past and present?
Why not go back to them and ask what the diferance is as you would like to upgrade your transom to the later spec
Id susspect the difference is little if anything and me be a simple case of adding extra layup or stiffeners
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Old 03 October 2018, 14:21   #10
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Country: UK - England
Town: Surrey
Boat name: ocean pro 6.3
Make: Humber
Length: 6m +
Engine: 140hp suzuki
Join Date: Feb 2004
Posts: 504
Yeah I agree, will go back asking for more detail. I suspect it was someone in sales who responded, will ask if they can get more detail from those involved in the build process. I canít imagine there is much difference as you say and the difference between a 200kg outboard and one which is 227kg is fairly minor, even less for the Mercury 200hp which is about 216kg.

Will see if I can get more detail from Humber and report back
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