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Old 20 February 2014, 17:37   #1
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Oil Mixture Evinrude 8hp 1990

Can anyone clarify the correct mix for this engine is it 50:1 or 100:1 i have read both in service manuals,,any help greatly appreciated.
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Old 21 February 2014, 14:07   #2
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Not sure on the correct mix but on an older engine like that you wont do any harm running on 50:1 even if its a 100:1 engine many were exactly the same
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Old 21 February 2014, 14:46   #3
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50:1 the manual says TWC-3 oil
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Old 21 February 2014, 15:41   #4
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Thanks guys ran engine up today with fresh fuel at 50:1 mix using Rock tcw-3 synthetic oil and now a lot less smoke,think the last owner was using chainsaw oil! Just got new plugs to fit and get some spare shear pins and i'll be heading for loch lomond a fortnight tonight with caravan,will take new Suzuki 2.5 hp just in case.
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Old 22 February 2014, 00:26   #5
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If he's been running it on chainsaw oil, grab yourself some Quicksilver Powertune and follow the instructions on the can. There'll potentially be quite a bit of carbon buildup in there.
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Old 26 February 2014, 10:09   #6
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either that or he / she was using the old "add a bit extra for good measure".....

Keep doing that with a "substantial puddle", add a bit more for good measure and the over oiled dregs keep adding to the mix too......

The guy I bought my old Yam 55 from admitted to doing the "add a bit extra for safety" - the engine ran much better after cleaning the plugs (twice!) & a good blast round the Kyles at WOT-ish with actual 50:1 to clean the soot out.
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