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I have an 2000 Ultra 150, I assume same motor as 2000 STX. I always premix about an ounce of oil to the gallon in addition to the what is provided by the oil pump, just for insurance when running at high rpm, because I understand the pump to be variable with speed but I worry about it providing enough oil at max rpm. Is there something unique about the triple cylinder Kawasaki from the 2000 era that you can't premix it? On my 1995 Yamaha Waveblaster 1 I removed the oil pump, installed a block off plate, and went to premix at 40:1 and ran it 13 years without any problems.
 

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The ultra 150 is the same engine as the Stxr. It's a completely different animal than the 1100 or the ultra 130 (which is the same as the stx1100 Di). No, you can't premix it that easily as it also feeds oil to the crankcase. The failures with the injection systems is normally lack of maint. to the lines. They become old, hard, and brittle.
 
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