First, because it has so much compression, that leads me to think the
engine is flooded.
Also the further the throtle blade is open(High Idle or too much
throttle), the least likely the engine will start (Unless it's flooded,
then pinch off the fuel line and hold the throttle wide open)
With a Brand new spark plug installed, Try reducing your idle setting
to get the lowest possible idle, then set your low screw to 1 3/4. With
a choke the engine should pop within 1-3 pulls, after it does, remove
the choke and try again.
Once it's running adjust the idle screw(not the low screw) to an
appropriate idle, then readjust the hi screw for clean running on top
end.
Should be easy to start after that, unless there is a vacuum leak on
the base gasket or carb gaskets.
good luck
--
Capt. Quirk
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