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    new o2 sensor for 2002 ox66 250

    just ordered a bunch of new parts for my engines and when i opened the package noticed that the o2 sensors had something like grease on the threads which spread to the sensitive protion of the sensor. any problems with this?? should i clean them before install and if so with what? thanks in...
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    2002 ox66 250 won't idle down after warmup

    i have a 2002 ox66 250 yamaha (sx250txra) that normally would idle around 1100 rpms for 2-4 minutes when first fired up, then idle down to 500-600 rpms. the last two times i took it out it will not idle down until i take the boat up on plane for a while. after i get the engine warm it's fine...
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    2002 ox66 250 oily exhaust residue below exhaust holes

    i have a pair of these on my boat, and recently the port engine has had a significant amount of oily discharge just under the holes that exhaust is supposed to exit. it comes out from under the edge of part of the housing surrounding the lower part of the powerhead. the other engine does not...
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    2002 ox66 250 losing rpms over 4500rpms

    i have a 2002 ox66 250 that runs fine at lower rpms and then feels like it loses a cylinder or two as i push it harder. boat is a 27 contender with twins and other motor is fine. engine does not die only loses 200-400 rpms. i have replaced the fuel pump and the plugs, but still have the...
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