Mike
You can always take the back flame arrestor off and try choking by holding your hand over the carb throat while you use a remote starter switch or someone else in the cockpit starts the engine. This should help narrow down whether you have a choke issue or not.
How do you have the choke adjusted? The movable arm needs to swing through its entire range and not hit the fixed arm or anything else such as the outer cover in the hold down bracket.
Also, is the poppet valve on the choke plate somehow not right?
TRUE GRIT
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