New spark plug, carb cleaned, new gas.....won't start......could it be the coil?

Flush old gas. Clean or replace spark plug. Check float on carb, clean carb bowl if equipped.

CLEAN OUT THE CARB JETS AND SET FLOAT LEVELS

The voltage regulator/rectifier will not affect the starting. Pull a plug wire off, turn the key to try to start to check for spark. If it has no spark, replace the coil pack or make sure it hasn't rusted between the flywheel and the coil contact. You can get more detailed info for small engine spark and coils on you tube.

Clean or change air filter. Clean, gap or change spark plug. Empty gas tank add fresh gas with Stabil. When spark plug is removed pull rope several times to blow out cylinder. Spray starter fluid in spark plug hole before replacing spark plug. Clean outside of carb so choke works freely. Spray starter fluid into carb breather hole with air filter removed and try to start. if running replace air filter and cover. If no start disassemble carb and clean. If no start replace carb.

If plugs are dry then blocked idle jets are the most likely problem...

after a year sitting idle chances are that the gas inside the carb has degraded and the carb will need cleaning also when you filled the tank did you remove any old fuel? if not the its contaminated with the old gas
give it a full service new feul clean carb clean air filter then it should start

hope this helps

john

Remove the plugs and see if there was an overflow. Now check the spark intensity with the plug connected. If this is low then check the coils and the LT trigger on the coil.
Make sure the spark gap is good , the plugs are clean and then check the carb for blocked jet.

need to check for spark---- magneto [magnet-pulse to coil] may have rust causing failed spark can clean lightly with sandpaper but more than likely u need to clean the carb-buy a rebuild kit about 10 bucks -take off carb tear apart and let soak in parts cleaner use a carb cleaner and spray all the nooks and crannys in carb rebuild replace and try firing up because more than likely the carb is completely gummed up from the old gas

check the distributor or the mould

Not so many reasons she won't start. 4-Strokes are Simple!

Here they are:

Motor:
Fuel Tank-> Fuel Line-> Fuel Filter-> Carb-> Intake (Valve)-> Piston-> Exhaust (Valve)-> Muffler

Carb (Old Style):
Fuel Side:
Fuel Bowl-> Float-> Needle Seat-> Fuel Ports (Venturi)
Air Side:
Air Filter-> Carb Air Intake-> Butterflies (2)
(Clean 'em ALL!)

Hardware (Motor):
Rotor (Magnets)-> Magneto (Ignition Coil)-> Spark Plug Wire-> Spark Plug-> Cylinder Head (Spark Plug Ground)

Ignition:
Kill Switches (Seat, Clutch, etc.)-> Spark Plug/Ignition Coil-> Ground
Key Ignition-> Battery->Starter/Generator

If one of those fail.......= Non-Starting 4-Stroke!

Fixes-
Fuel:
You are either getting too much, or too little. Too much = Carb.
Too little = Carb. Therefore, tear down the Carb (COMPLETELY-Careful!) and clean it up.

Electrical:
Grounding out the System (Kill Switches)
Battery-> Ignition-> Starter.
Magneto->Plug Wire->Plug (Check 'em all!)