how to change barrels on runner ?

ok i need to change the barrels on my runner 125 2stroke but aint got a clue how to do it. i have taken the green bit off the back of the barrels but when i try to pull the barrels out they seem like its hitting something? some help cos its getting on my tits now lol cheers

 

actually dont worry bout that i worked out how to get them out n that but now when i put my new barrels in the key just spins - i have pushed the little clip all the way down but it still spins

 

it isnt pushe in enough with the clip in can you pull the barrel out still

 

sounds liek your steering lock bit in your barrel is buggers, often happends when a bike gets barreled and pricks stick screws in the barrel to try rip it out.

 

ah i descovered the prob i was puttin the clip in rong bit. thanks for ur help dudes ! sorted now