I don't have much experience with them myself. I know it's an old school 2 stroke design engine with basic fuel injection, but I believe the ox66's used an oxygen sensor mounted in the powerhead in the top of the exhaust port to provide air/fuel data to the ecm to help eek some milage out of them. I know I've read the O2 sensors were problematic in them and required frequent cleaning. Otherwise they're supposed to be some of the best engines Yamaha turned out.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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