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Motor will not start

Homelite AP 125 two stroke motor will not start fuel lines replaced and routed correct.

Spark plug replaced and has spark.

Fuel mixture 50:1 fresh batch.

choke and run switch all operating fine.

Fuel is in lines and primer bowl fuel is getting to cylinder also.

After trying to start for a minute or so fuel will run out of the carb.

Any ideas what may cause this and how to correct.


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  • dcnt1 Mar 19, 2009

    Thanks that did the trick...



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For some reason the engine is flooded. To make it start do the following: turn the choke off, hold the throttle wide open and crank it until it starts.Do not push the primer bulb first. It already has more fuel than it can burn. It will smoke more than usual until it burns out the excess fuel. You may also have a carb problem but this should allow the engine to start so it can be diagnosed.

Please rate this solution if it helps-

Posted on Mar 19, 2009


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

Here they are:

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)

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

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

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.

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

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