Two Stroke
50 H.P.
50 HP stock
50:1 mix
it is a 485cc fan-cooled 2-stroke engine.
The correct ratio for 1991 85hp Yamaha is 1:50. 1 liter of oil for 50 liters of fuel.
no drainplug on the engine. fan-cooled 2-stroke. it has no dedicated oil sump. to drain the chaincase oil just remove the cover, wipe out all the oil, re-install chaincase cover and fill with new oil.
32:1 is standard fuel mixture for 2 stroke engines, you can use different ratios but this is the reccomended ratio by the manufacturer.
The dry weight of a 1991 model, 130 hp Yamaha outboard is 357lbs.
1991
bore 3.497 stroke 3.81
1991
1991