Gas smell

[cray]

My 2007 Mercury 40 4stk has developed a strong gas smell when I start it up. It doesn't happen after the motor has been running for a while.

I checked under the hood several times and found no gas leak there. I have not had the valves adjusted yet. Could the motor be spitting unburnt gas out the exhaust because of the valve thing?

Any ideas?

[ranger20]

when the motor is running does the water by the motor have the rainbow looking color??

[cray]

Yes. There was a small slick the last time I ran it.

[jeffreyd]

check the oil to see if you have gas in the crankcase. Could be leaking into crank and then blowing out exhaust.