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Cool!
A Project.
Remove the spark plug lead just so you can't have it accidently fire.
Remove engine cowlings as necessary to get at recoil starter.
Remove recoil starter (that's the bit that the pull rope is attached to.
Dis-mantle it until you can find what is wrong. Fix or replace.
Put it all back together.
or
Take it to a small engine repair shop and pay a bunch.
I am suspecting you may have some issues inside the cylinder. If it gets easier when warm / hot. You may have a stuck ring or a ring almost stuck.
Is it hard to pull with the sparkplug removed?
Pull the muffler and with a soft wooden item (chopstick works well) push on the ring, does it move freely or is it solid?
If the pull start is stuck, it is normally because it is kinked and knotted inside the coil housing. Take the top off, pull out the spool, rewind the rope, put back together, and pull start away!
You have to find a way to push the starter. It normally gets all stuck due to grease. One push with a screwdriver on the actual starter (The thing the rope turns) should wind the whole cord up. If not, clean it. Alot of oil/chunky-ness gets trapt when your using it.
I spent a lot of time, but I found that most of the problems with this starter rope etc, are caused by the starter assembly being too tightly mounted to the motor assembly causing drag on the rope mechanism.
I fixed the problem by adding spacer washers between the starter and the engine mount (two small washers on each of the 5 or 6 mounting bolts adding about 1/4 inch of clearance.
Now even my wife can start this machine..
Assuming the rope stays on the internal pulley, it is NORMAL for the rope to require great force at points in the cranking cycle (once per revolution of the crankshaft). These are the compression strokes and the force is MANY times the initial pulling force. If the rope returns easily, then the starter assembly is probably normal. It takes a strong arm and fast movement to start the enginess via pull rope. Some units have a compression release to ease this a bit.
Basics to check:
1) Spark plug - brown or dark brown - OK a) is it carbon or fuel fouled b) is there spark
2) Muffler remove for inspection a) exhaust screen clean or plugged b) inspect cylinder wall/piston as the flywheel is slowly rotated
3) Check cylinder compression
starter coil rope is strck in the coiled position. How to get it free ?
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