Re: big help needed
Before you go randomly replacing things and spending lot's of money, let's try and narrow down what the problem is. Best place to start is checking for spark. Find where the plugs are, remove them from the head, reconnect the wires and have someone crank the engine while the base of the plug is touching the engine block. You should have a nice bluish white spark across the gap. If so, check the plug gap for .030" and reinstall the plugs.
Next thing I would do is put some properly mixed 50:1 clean fuel into a small squirt bottle so you can squirt a little into the carb intake. Once you squirt in a 1/2 a teaspoon or so, try cranking and see if it will fire. If so, then fuel isn't getting to the engine. remove the fuel line from the carbeurator inlet fitting and hold the hose into a tin can or cup. Squeeze the primer bulb, does fuel come out of the hose? If so, have someone crank the motor and see if fuel squirts out in little spurts, if so the fuel pump is working.
If everything is good to this point, I would suspect plugged jets and passages in the carb requiring dis-assembly. Do a search for cleaning carbs on this forum, there is lot's of good info here. Don't overlook your fuel and oil mix. Too much oil and it can foul the plugs preventing running, and too little and you wreck the engine. carefully measure it out. For a 6 U.S. gallon tank it takes 1 pint (or 1/2 a quart) of oil.
