Do these motors build compression?

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fundreamer1

New Member
Dec 6, 2010
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Oklahoma
When I was riding today, the motor was getting progressively harder to start. Once the motor turned over it would start easy enough, but it was getting harder to turn the motor. The last time I started it, I almost couldn't the motor seemed almost impossible to turn, when I popped the clutch the bike stopped! I had to peddle it very fast before I could get the motor to turn enough to start.
My question is can the compression build up enough when the motor is warm to do this, or could it be something else?