Unfortunately all my brochures and texts dont give a fuel oil ratio,So I Couldnt tell you Of SB,s specific ratio,"Grumpy" might be able to tell you more precisely,But its just a normal 2 stroke so id use the ratio given by most manufaturers for the period of 25:1 I wouldnt lean it out really because of its age.So 25:1 should be just fine. As for your Jolt yeah it would still pack a punch its a coil! lols But seriously until you lift the lid you wouldnt know whats underneath,it may have the earlier engine/coil combo that never used the magister,might explain the starter too,who knows?.