How to identify my pit bike engine .the engine numbers dj152fmi

is the bike a2 stroke or a four stroke? regards Ray.

You sure can..

you cant

check to see if the trottle cable is attached to the throttle lever, the piece on the engine

I'd start by hooking the motor back up to the frame then lift it up so you can put the top engine mount bolt in and then u just have to tighten the motor down and hook the lines back up and electrical and ur good to go.

driveshaft or chain

You didn't say what year model, but really not much has changed on the GPX over the years. Which makes this engine swap a snap. You can try ebay for a used engine or possibly someone parting out a bike. Also, a company called Factory Powerhouse, they sell bolt in (pit bike) engines.
Here is the link, i hope this helps.

http://www.factorypowerhouse.com/Pit-Bike-Engines-s/50.htm

you may be able to get parts for your pit bike at, www.bitzforbikes.com or www.wemoto.com you might find that you've got a Honda engine in it alot of them do. Good luck

it has a centrifugal clutch
its spring loaded shoes engage the drum when the engine revs are increased !
Cheers Rob