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That is normal.
To negate this you can loosen/remove the timing chain adjuster.
However it is not necessary to do this.
What I would suggest (just to be sure) is to remove the spark plug, and verify that you are actually at TDC on the piston when your cam marks are aligned.
May just be that one of the fellas at the factory was fighting with his boyfriend, came in to work drunk, and thought he'd have some fun with the scooters.
Just verify TDC, and you're good to go.
Another tip to double check the adjustments is to spin the crank thru its stroke, and verify each valve indivualy at full close.
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