My 125cc 4 stroke pit bike wont start, if it does it runs a couple of seconds...

[Reuben]

...and cuts out? hi there, i purchased a duff pit bike off ebay and i just wont go i got it running it idled for 5 seconds, and cut out so then, full throttle and kicked it up, it ran on full throttle, then died i started it up on idle again but it wont rev it bogs and cuts out is this due to the carburettor?

 

[Unregistered]

Mate. Wind the screw outwards the one with the spring on. It wil click as u undo. Do it for one or two clicks and give her a try. If it improves a bit. Wind outwards more. But do not forget to count ur clicks for returnin the screw to where it ran if it makes it worse