The play in the shaft that your flywheel is causing your issue-you need to find the reason for that 1/2 inch wobble, although the most obvious would probably be a rear main bearing.or a bent (?) crankshaft...ask your rebuilder to double check the bendix gear operation on the starter, but it sounds like your problems are not the starter based on your description.
The 1995 Triumph Thunderbird is known for Sprag Clutch failure. The sprag clutch acts as a one-way clutch to allow the starter motor to
drive the crankshaft and thus start the engine. Once the engine starts,
the crankshaft is turning faster than the starter motor can, so it
basically "free-wheels." Also, while you are in there, take not of whether you have the 51 tooth gear or the 53 tooth gear. The 51 tooth gear had problems, so Triumph changed them for a 53 tooth gear. I would recommend obtaining a service manual for this bike before attempting to replace the Sprag Clutch.
I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514
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u know that this is a motercycle right ?
this is a triumph motorcycle not a car
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