I bought a 2004 3d and first day out it seemed to run really good. The next time a week later having hard time to get up on plane from lack of power like 1/4 power at full throttle. The front plug looks great but back plug is way more black looking. Compression 150 psi both cylinders. Fuel is fresh 91 octane premium fuel. Should I maybe run regular fuel 87 octane is what owner manual says? The same as day before other than adding 10L more 91 octane premium fuel. I changed both plugs with new plugs and same results just will not rev out pike 1/4 throttle. Stars extremely good and idles great. So any idea or help. Thanks.
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