Blade CX-Can't Hoover

[Pipes]

I can't keep a stable hoover the heli keeps going in a circle counter clock wise. do the blades need to be balanced?. Can someone give me some help.
Thanks

[eddiemoth]

Balancing blades can help sometimes but I think it might be something else if you have used all the trim. How long you have the heli? I am thinking about one of the motors is dying. Does this happen because you crashed it?

[Pipes]

I looked at the HELI and I noticed that on the bottom baldes where it connects to the main shaft there should be two plastic pins,one for each blade ,well one of these pins are broken so I will replace that part, I think thats why I was ahving this problem.
thanks for yr input.