I have replaced filter before attempting to start the engine, then I checked spark plugs, cleaned them and adjust the gap to 0.035"
I have checked the spark only on one plug!
Although I have checked, and cleaned Distributor Cap and Rotor,
the engine has very little run hours, mostly just sitting on the salt water or marina spat.
Then I was told that the gas must be old so I puled out ~ 20 gallons and put a fresh in, and it still wont start

remove dist. cap and crank motor check if rotor is turning. make sure coil wire isn't going to light up when cranking.

Something doesn't add up, you have fuel and spark but won't start...

Timing?
Low Voltage?

It sounds massively flooded to me. I would hold the throttle wide open and crank it until it starts. If you pull a plug out after cranking is it fuel soaked?

I understand you have spark, however:

BT may be correct. Try what he says then if nothing still:

1) replace plugs. They can get oil soaked from the fogging you did for the winter. Cleaning won't cure this. New plugs and gap to .035"-.040"
1a) if cap/rotor is electrically eroded, cleaning will not repair them.

2) If still no start check voltage to coil. Should be battery voltage.

3) Do you have a fuel shut off valve ? Did your fuel pump schit the bed ? Carb may still have fuel in bowls (not for long though) and tease you.
3a) Make sure choke is not stuck closed. As mentioned above, putting throttle to WOT should fully open choke. Of course, if engine fires bring throttle right back down. No need to blow up engine on trailer.

4) Do a compression test.

5) Check for nests/animals/insects (ie:blockage) in your fuel vent and exhaust pipes. Damn critters !

6) Check your fuel. Smell with nose and if it does not burn your nose and has almost no aroma, it's weak and won't light.

Had you done anyh other boat (not justg engine) work after winterization ?

Yes
I have replaced all gauges just like ther were before.
I have replaced Shift Cable, all bellows and gaskets.
I have replaced gas in the tank, and fuel filter/water separator
I have cleaned up the carburetor and replaced ignition coil with spark plugs.
I have checked solenoid, and kill break is working,
It is still not starting!!!
I have ordered the Distribution Cup with router, and spark plugs wires set.
I just can not see the timing to be changed, HOW???
I have replaced the water hoses but not the belts!
If I will screw something up with wiring then there will be no spark!
Oh!
THERE IS THE SPARK, BUT I THING IT IS NOT TOO STRONG!
The spark on the spark plug looks fine, but on the special tester where the minimum spark length should be around 3/16" - it is not present!
It shows up on on the gap distance around 1/32"
So, I am going obsess!
I have 40 years of mechanical back grand in different fields, but this is still amazing to me!!!
There is a gas and the spark, and the timing is untouched , so what a heck is it???
Krzychu
PS
I did not check jet for clogged vents!

You know if I had a dollar for everytime a guy could not get his engine to start, and I jumped in and did what I said above and whala, fires right up.... well, I'd have at least 10 dollars :p Did you try this yet?

BT :cool:

If you have HEI ignition and it won't jump 3/16 I would think that is a problem. Maybe you left the key on too long at some point and burned up your coil. At this point you can bring it to a shop, try a new non resister coil or PUNT.

Man i hate to be negative, but if you did ALL that already, there really isn't much left. I have this eery feeling that when you do find the problem, it will be so simple that you'll just about kill yourself.

The only thing I can think of, is timing. By reviewing your responses, it seems like that is the only thing you have ASSUMED to be good. I've learned to never assume anything!
You never know. I had a ford 390 once that ran perfect until is was shut off one day, the next day it would not start. Turns out the roll-pin that holds the gear on the dist. shaft sheared, and the timing was off by 40 degrees. Never hurts to check.\

Nick

I one time flooded an engine so bad it washed all the oil off the rings and created low compression, too low to start. I had to go through each spark plug hole and squirt 10w30 on top of the piston to get the compression back up before it would start.

Do you smell fuel in your motor oil?