Tao Tao Coolster 110cc Pit Wheeler Has Spark But Won't Start Motor and Compression Troubleshooting

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I rebuilt this Chinese Coolster Tao Tao 110cc youth ATV quad earlier this Spring with spare parts after it was found to have a seized crankshaft. It was running like a champ for my nephew then just died. Cranks all day with solid spark but the motor won't fire even with ether in the filter or head. What happened?
It wasn't what I thought but boy did I feel silly once I found the issue.
This one is a model 3050b. No reverse gear on this motor.
Update 1/20/2022 - I had to trim out some music audio midway through for a copyright claim. Turned out I only needed to add a link below but I can't revert the 'mute' that I did. Apologies for the dead sound spot.
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Music: The Only Girl - Silent Partner • The Only Girl - Silent...
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