Kawasaki recommends 10W40, 10W50, 20W40 or 20W50 for these engines. Any xW30 is too light.
I originally used 20W50, found that 10W40 made shifting gears a little easier, and lately changed to 15W40 mainly to avoid the "energy conserving" additives that can cause clutch slippage.
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Bill Frazier
1982 KZ440LTD
Original owner
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