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Just a thought without looking at it but could be loose wires involved with the coil. Bad coil wire.[burnt or worn on inside] Can you see spark jumping from pug wire. If so try tape on wire, and if that helps ,replace wire ,and coil if inseparable. Also check wiring coming from magneto, points or cdi . Electrics are the mechanics worst problem to solve.
It's likely to be either spark or fuel.
Remove the spark plug and inspect it. There are pictures of good and bad plugs on line, the plug can tell you a lot about the fuel mixture and how well the motor is running.
Check that there is a spark jumping the plug gap when you turn the engine over (the plug body metal must be touching the engine metal to complete the spark circuit).
It's worth trying a new plug in case the old one has failed, even if the spark looks ok, sometimes a plug only fails when under pressure.
If there is no spark, check the ignition wiring (particularly connectors), kill switch, key switch, coil etc. You might have to get an expert to test these things for you.
If there is a good spark and a new plug makes no difference then it could be fuel. Easiest way to check is to get a can of Easy Start or similar and spray it into the air intake as you try to start, if it starts then look for a fuel problem.
Make sure there's enough fuel in the tank, the tap is on (try on reserve too), the hoses are not kinked or blocked.
If it's a blockage in the carburetor it's probably best get a mechanic to check/clean it.
Good luck.
Check fuel lines and the spark plug wires for cracks or rips. The plugs may have been damaged when you hit the tree. Check fuel pump connections for loose or broken connections. Sounds like no fuel to the plugs to keep it going. If you hit the tank, check the fuel pump operation was not damaged.
Troubleshooting
If
Check
Engine will not start
·Battery has low voltage.
·Loose or corroded battery connections.
·Fusible link is melted.
·Spark plug wire is loose or disconnected.
·Faulty spark plug or coil.
·Fuel shut-off valve turned off (if equipped).
·No fuel or improper fuel.
·Plugged fuel filter.
·Defective starter solenoid.
·Open-circuit in wiring.
Then either the fuel is bad or it's flooded. Dry the plug, crank it without the plug to fry the cylinder & start with starter fluid to replace fuel. If it starts. Clean & blow out the entire fuel system, lines, pump,carb. Good luck.
Have you checked the Spark Plug ? No Spark & No Fuel means not going to start and run. If you are getting fuel then your Spark plug may need to be cleaned or replaced or even re-gaped. Spark plugs have a tendency to get fouled out. Meaning oil gets on it and it can not throw a good spark. If you do have a good spark then check the choke and or the float in the carb.
if thats all the info you have you need to take it to the dealer.
those have way to many possible problems.
1. bad spark plug seal, dirt fills up the entire spark plug hole especially sand.
2. they have fuel pump pressure issues due to poorly constructed fuel pressure regulators.
3. fuel pump itself
4. if intake or exhaust is modified it may overheat after it shuts off (engines get much hotter after they are shut down) will not start if too hot
5. one of the three ignition coil might be failing
6. CDI may have failed
7. Spark plug might be hot fowled.
Not starting issues are usually spark or fuel problems. If you have gas getting to the carb then check your spark. First check all the wire connectors and plug wire to make sure everything is connected. If you find a loose connection fix it then try it. If not, then remove the spark plug but leave it attached to the plug wire set it on the cylinder head and turn the engine over. You should see a bright spark. If you have a really weak spark or none at all, then it may be your ignition coil or a related ignition part.
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