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I put one of the ProTek wakeup kits on the Yamaha 650 motor that was in my old 93 Boston Whaler Rage jet boat and when I pulled the head off it was one of the cleanest motors I've ever seen. I was worried that the mods would hurt the motor but it actually started easier and ran better with the mods. I always ran 93 octane pre mix in it though. That really doesn't look too bad overall but it obviously needs help. Were you or the previous owner running regular gas because the piston looks pretty clean?
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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