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    1999 ox66 250 lean on top end?

    Just put in new o2 sensor and replaced all fuel filters and all 3 low psi pumps. Vacuum checked after and everything looks good. Motor runs great , but when I look at the plugs after a run they are a very very light brown. Still seems a little lean to me. Anyone know for sure what they should...
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    Ring free cleaning

    Doing a full clean on 1999 250 ox66, I am seeing a lot of oil coming from exhaust and bogging at idle, also almost sounds like spark knock or out of time at cruising rpms 3800 and up. Is this normal while running ring free at full strength? One bottle to 6 gallons of fuel...
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    99 250 ox66 unstable rpm's high speed cutout

    1999 Yam 250 ox66 fuel injected is varying 300 rpms when cruising, 200 rpm's when idling, also cut out on top end 5500 rpm's but restarted normally. Checked compresson 110 to 120 on all cylinders. changed plugs and fuel filter. What next? Thanks Hank250
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