225 ox 66

[fliboi21]

Folks I got a OX66 225. My problem is on start ups its smoking quite a bit and there is raw gas coming out of the exuast. The smoke clears after awile, but it still doesn't seem right. The motor is a 99, but is new to me. I just replaced all 3 low pressure fuel pumps and thermostats. I checked compression an its right on. Motor runs perfect..idles at 700 rpms with out a cough. Thinking O2 sencer...Any thoughts would be helpful. thanks

[fliboi21]

yeah, i was wondering if the oil was it. The previous owner ran merc stuff. I started running yamalube