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07-11-2011, 11:56 AM
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#1
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Registered User
Country: United Kingdom
Location: Dorset
Occupation: Marine Engineer
Interests: Driving boats fast, wakeboarding and boating to pub
Boat name: none
Boat make: Ring 20, 17ft Plancraft Sabre
Engines: Mariner 200 2.5, Yamaha 115 V4
Cruising area: Poole
Join Date: Aug 2009
Location: Dorset
Posts: 70
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correct oil mix
Hi, i have a mariner 200 2.5v6 year 2000 carbed model, just wondering what the correct oil/fuel ratio i should be running it on should be?
Oli.
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07-11-2011, 01:23 PM
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#2
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Registered User
Country: Guernsey
Occupation: Postie
Interests: Heavy Heavy Metal
Boat name: Slayer II, Slayer, Pen15
Boat make: Phantom 19G-R, Bernico F2 Extreme, Ring 15
Engines: Evinrude 115HO, Yam 90
Cruising area: Channel Islands
Join Date: Aug 2009
Posts: 1,460
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I ran 40:1 Merc Premium Plus in mine. Some people use 33:1 but unless you're revving the hell out it there's no benefit, just more expense!
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07-11-2011, 01:29 PM
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#3
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Senior Member
Country: UK
Location: Devon
Occupation: Garage Proprietor
Interests: PowerBoat Racing
Boat name: If Only
Boat make: Bernico F3 OCR, Bernico Prototype Inboard, and some Ribs
Engines: Yamaha Pro V 115
Cruising area: UK, France
Join Date: Jan 2005
Location: Devon
Posts: 3,095
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Standard 200 should only be 50:1 on a good TCW3 oil !!
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If Only
National Outboard Immersed Propeller Mono Record 103mph
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07-11-2011, 02:52 PM
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#4
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Registered User
Boat make: Phantom 23
Join Date: Mar 2006
Posts: 1,693
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32:1 On xr2 I'd run no less than 40:1
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07-11-2011, 02:54 PM
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#5
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Senior Member
Country: UK
Location: Devon
Occupation: Garage Proprietor
Interests: PowerBoat Racing
Boat name: If Only
Boat make: Bernico F3 OCR, Bernico Prototype Inboard, and some Ribs
Engines: Yamaha Pro V 115
Cruising area: UK, France
Join Date: Jan 2005
Location: Devon
Posts: 3,095
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Who mentioned XR2 ?
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If Only
National Outboard Immersed Propeller Mono Record 103mph
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07-11-2011, 03:02 PM
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#6
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Registered User
Boat make: Phantom 23
Join Date: Mar 2006
Posts: 1,693
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thought it might be simular as there both 200hp, steel lined & carbed
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07-11-2011, 03:59 PM
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#7
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BananaShark Member
Country: UK
Location: Salcombe South Devon
Occupation: Racer and builder
Interests: Winning races
Boat name: BananaShark
Boat make: BananaShark 34' Race
Engines: Twin Yanmar BY 260's
Join Date: Mar 2004
Location: Salcombe South Devon
Posts: 4,638
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Different RPM's, CC's and probably a load of other stuff as well!
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Cookee
British Champions! RIB Formula 1 2005
National Speed Record Holder at 90.15 (still)
www.bananasharkracing.com
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07-11-2011, 04:02 PM
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#8
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Registered User
Boat make: Phantom 23
Join Date: Mar 2006
Posts: 1,693
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Quote:
Originally Posted by Cookee
Different RPM's, CC's and probably a load of other stuff as well!
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Well I guess my post was about as useful as yours then lol 
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07-11-2011, 04:21 PM
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#9
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Registered User
Country: Channel Islands
Location: Guernsey
Occupation: Plant Operator
Interests: Cars/Boats/Bikes/Women/Beer
Boat name: Paranoid
Boat make: Phantom 20
Engines: Merc 2.5
Cruising area: Herm/Sark
Join Date: Jul 2009
Location: Guernsey
Posts: 269
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i run 32.1 on quicksilver premium plus for piece of mind, revving around 6800 rmp, no smoke, screams like a banshee! its up to you what you feel comfortable with.
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07-11-2011, 11:11 PM
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#10
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Registered User
Country: UK
Location: Weston Super Mare
Occupation: Electrical Engineer
Join Date: Mar 2004
Location: Weston Super Mare
Posts: 6,351
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Quote:
Originally Posted by Paul E
I ran 40:1 Merc Premium Plus in mine. Some people use 33:1 but unless you're revving the hell out it there's no benefit, just more expense!
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 plus you are actually running lean if you over oil!!! 40:1 unless consistently above 7k
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08-11-2011, 12:01 AM
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#11
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Registered User
Country: United Kingdom
Location: Dorset
Occupation: Marine Engineer
Interests: Driving boats fast, wakeboarding and boating to pub
Boat name: none
Boat make: Ring 20, 17ft Plancraft Sabre
Engines: Mariner 200 2.5, Yamaha 115 V4
Cruising area: Poole
Join Date: Aug 2009
Location: Dorset
Posts: 70
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i expected about 40:1, many thanks for your advice guys.
oli.
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08-11-2011, 10:00 PM
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#12
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Trade Member
Country: United States
Location: South Texas. USA
Occupation: Own JSRE ( Jay Smith Racing Engines )
Interests: ACCELERATION (anykind )
Join Date: Jan 2006
Location: South Texas. USA
Posts: 244
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I never run a large bored outboard ( 3.500" bore ) motor less than 40:1 . Never seen a situation where you make power or add longevity by short cutting a motor of oil...50:1 is great on the smaller bore sized Mercs
( 2.4/2.0 liter ) but not the 2.5.....
My rule of thumb on my 2.5's is :
8000 rpm or less mix at 40:1
8000 rpm or more mix at 32:1
I also NEVER run a fully syn oil in any steel sleeved motor only a BLEND and then after its completely broke in..
Jay @ JSRE
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