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Old 18 April 2007, 16:01   #11
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Country: UK - N Ireland
Town: Donaghadee
Boat name: JUST4FUN
Make: Scorpion
Length: 8m +
Engine: Suzuki 300 outboard
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I have just purchased a new Scorpion 8.1 with a new Suzuki 300 engine and it just cavitates .I have been in touch with scorpion just 2 days ago to say the the cavatation plate is sitting 3 inches above the transam ,they have told me that this is normal and explained why.They have sent me today a new prop that I tested for them this afternoon ,its giving better grip but less top speed so hopefully a 24 inch prop is on its way tomorrow that should correct the top end speed.I have found Scorpion very helpful in trying to rectify the problem and they are apologetic but have said this engine is new to them as well as this is the first 300 engine they have supplied.
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Old 18 April 2007, 16:04   #12
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Country: UK - Wales
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Boat name: Too Blue
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Length: 8m +
Engine: Suzuki DT225
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Originally Posted by Paul Williams View Post
I have just purchased a new Scorpion 8.1 with a new Suzuki 300 engine and it just cavitates .I have been in touch with scorpion just 2 days ago to say the the cavatation plate is sitting 3 inches above the transam ,they have told me that this is normal and explained why.They have sent me today a new prop that I tested for them this afternoon ,its giving better grip but less top speed so hopefully a 24 inch prop is on its way tomorrow that should correct the top end speed.I have found Scorpion very helpful in trying to rectify the problem and they are apologetic but have said this engine is new to them as well as this is the first 300 engine they have supplied.
What sorts of speeds are you getting with different props - interested in the 300 myself!!!
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Old 19 April 2007, 04:34   #13
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Country: UK - N Ireland
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Make: Scorpion
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Engine: Suzuki 300 outboard
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With the 23 inch prop 3 I am acheiving 60mph but the prop is cavatating so the accelaration is poor so trying a new prop this weekend
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Old 19 April 2007, 07:30   #14
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Country: Netherlands
Boat name: Dexels
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Engine: Evinrude 250 E-Tec
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Revolution

Hi Roy,
I own a 8.1 with a 250 E-Tec. My propeller is a Mercury Revolution 4 21" pitch.
The top speed that I have managed (1 person) so far is 90 km/h which is over 48 knots.
Since it is a 4 blade propeller, I do not have a power lift installed, I expect to go at least
5 knots faster when optimally tuned with faster prop and power lift.
The Scorpion handling is amazing, it drives easily at top speeds (no chinewalking whatsoever).
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Old 19 April 2007, 17:52   #15
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Country: UK - England
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Well the engine is now Cav plate 2 1/2 " above hull line and i am collecting a
23" by 14 1/4 pro plus competitions Yamaha prop.
as the other props where 14 this extra 1/4 should help a bit and it should rev a bit more = better top end so hopefully fingers crossed this should be it
I had the same problem when i had one of the first 250 they said the same to me new engine etc. but i would like to know what yamaha recommend there must be a maths calc to go by
It would be nice to know what others have had there engine set at
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Old 20 April 2007, 00:24   #16
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Country: UK - Channel Islands
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Make: Cougar R8 Sport
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Engine: 350Sci Verado
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Hi Roy
I have a Scorpion 8.1m with a 250 DI, using a 23 mercury s/s high 5 prop.
I was out Monday 2 adults 4 teenagers dingy, small outboard,and about 280ltrs of fuel. I achieved about 40-42knots. On my own the previous week in calm seas with 160ltrs fuel (boat empty of rubbish..) I get 46-48 knots.
In the new Sports boat and rib mag there is a catalogue showing lots of different props, i quite fancy the new Merc Enertia..
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Old 20 April 2007, 06:48   #17
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It makes me wonder how much we have to spend to achieve
4 / 5 kt more i bet that high 5 prop was not cheep
This pro plus thing i am collecting to day should have been 650 lucky for me they have taken the old one back in part ex
Things where much less complicated when i had a 560 Avon with a 100 Yamaha (cheaper to)
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Old 05 May 2007, 17:59   #18
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Well out to day
new Yamaha pro plus 14 1/4 " 23 " prop
7 up 350 lt of fuel doing 44kts at 5500 rpm WOT so i am at last happy
have not checked fuel used but it cant be any worse than before.
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Old 07 May 2007, 09:43   #19
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7 up
Is that a drink or a Snow White fantasy ?


Hi Roy, will the 250 not rev up to 6000 ?

If you're happy, that's the main thing.

ATB

Brian
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Old 07 May 2007, 17:17   #20
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No i could not get 6000 rpm
this prop thing is weird i can only get 6000rpm with a standard 23"black S/S
or 22" pro. So i thought i will keep the standard black for bad weather and water sking and the new one for cruising.
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