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ok i just got a 1990 550sx and i was wondering if this ski takes oil or is it just mixed with the gas?? its my first ski dont know anything about them...i see the gen cover in the front its dry dont see a plug i want to change out all the fluids where should i start??
 

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crank lube

Most modern two strokes are set up so the fuel/air mixture goes thru reed valve straight into crankcase on piston up stroke (thus lubricating crank etc). Then on down stroke piston pressurizes mixture and forces it up thru passages and ports into cylinder. You can usually visually verify this by noting intake manifolds position on engine. Does it dump into head/ cylinder or case. Hope this helps. :)
 
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