Justin Bieber Blazin' Again ... But Not Like That

12/19/2014 12:40 AM PST
EXCLUSIVE

Justin Bieber was caught speeding in the valley and it's cost him thousands ... which is just how he planned it.

Biebs was down for a little late night go-kart action Wednesday night for a bud's b-day ... and dropped a few grand for an after-hours, all-access adrenaline session at MB2 Raceway.

We're told ... JB arrived with a dozen friends -- including Hailey Baldwin. We're told he dropped $2,700 ... the cost of burning rubber for 2 hours.

The staff gladly stuck around ...  Justin threw them an extra $500.

Go Biebs Racer ... Go!