Rattles can come from various places:
Drop the scooter on the back wheel and see if the rattle comes from the rear
yes? Most likely the brake
Dampen the brake with your foot and drop the scooter
Rattle gone? Brake, which is common, you'll just need to stuff some Bike tube in there between the brake and the Deck.
rattle still there?
Check the Axle/Bearings
Same test for the front.
If it has a Threaded headset you'll be chasing a Loose headset problem forever- they just never stay tight.
Drop the scooter on the back wheel and see if the rattle comes from the rear
yes? Most likely the brake
Dampen the brake with your foot and drop the scooter
Rattle gone? Brake, which is common, you'll just need to stuff some Bike tube in there between the brake and the Deck.
rattle still there?
Check the Axle/Bearings
Same test for the front.
If it has a Threaded headset you'll be chasing a Loose headset problem forever- they just never stay tight.