Oset 16 24V Dullpower

[brem83]

Hi,can anybody shed some light on where I should start with my sons 07 24v 16 oset, it dos'nt seem to have the same power as his 12.5.

I fitted a new set of batteries and this has made a great difference to the length of time he can ride but the actual power the motor puts out for him getting up climbs etc seems to be lacking. Ive tried disconnecting the limiter but this makes no difference, I'm now thinking,new brushesin the motor or a new motor?

Can anybody point me in the right direction or had a similar problem?

THANKS