Does any one know what to do to start my mercruser 5.7 L after winterizing.
I have done the following:
1. replaced the fuel in ~ 90% of the tank
2. removed and cleaned all eight spark plugs and there is a spark while the starter is cranking
3. removed and cleaned the carburetor it is back in place and I can see two streams of gas shooting down into the both Barrels
I still can not start the engine, knowing that I did not change any original adjustments. Last October when I bought it, it was working but now there is gas coming in and there is a spark but it just does not work.
Please help!

Do you have a kill switch, if so is it hooked up? No I am not kidding or being a jerk.....It happens to most of us at one time or another.

Pump the throttle three times, crank for 3 seconds with throttle closed , pump 3 more times,crank for 3 seconds in idle positon. Continue till it fires. It may take 3 or 4 tries.

By the way spring came and went.

did you check for spark at the plug(actually using plug)? if not replace plugs. cleaning most times is not enough

open it up to 1/4 throttle and crank for 5 seconds at a time untill it starts.Also put new plugs in.

kill switch is up, if it was on, there would be no spark when I try to start the motor, right?

yes sir

Do you have spark?

if you fogged the hell out of it, pull the plugs, replace them, crank, pull nclean the plugs repeat a couple times, replace filter/seperater

Yes I do have spark and gas shooting in