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Old 14 October 2003, 17:05   #11
Richard B's Avatar
Country: UK - England
Town: Berkshire and Devon
Make: Lodestar
Length: under 3m
Engine: Mercury 5hp
Join Date: Jul 2002
Posts: 5,015
No, no, no... apparently you have to nurse them with special oil

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Old 15 October 2003, 02:28   #12
Country: Canada
Town: Newfoundland
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Posts: 2,097
Opti's take standard TCW3 dont they? If they dont my memory is going or I was doing the wrong thing when I ran one!! (I know Fichts take hugely expensive RAM oil. Good 'ol Yams run on anything TCW3!)

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Old 15 October 2003, 05:51   #13
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Country: UK - England
Town: Gosport
Boat name: April Lass
Make: Moody 31
Length: 9m +
Join Date: Aug 2001
Posts: 4,837
Tue, as Alan said no point in changing as power produced is based on fuel burnt. The formula for carb engines is 10 hp pr gal per hour. (This is a bit rough and ready but will do).

So a 2 Stroke 75 hp engine will burn 7.5 gph flat out or say 6 gph at cruising speed if the engine was only being asked to produce 60 hp, say at 4500 revs.

Keep the 200 hp engine until you can or want to trade it in for an Opti especially if its in good nick and reliable.
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Old 15 October 2003, 07:24   #14
Country: UK - England
Town: Paignton, Devon
Make: Chinook and Viking
Length: 7m +
Engine: 150 Etec + 125 Merc
Join Date: Jul 2003
Posts: 526
Thanks everyone. I am going to keep my 200 and save for an opti of similar size.
By the way Qicksilver do a special opti oil aswell but you can use standard TCW3 oil in them.


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