two cell & a pcb mod
 

i have put two batteries in my zip and am thinking about the pcb mod (jumper wire to bypass resistors) is it working for others.
If it were to fry something would it just be the motor or something in the pcb.

I have two cells and the PCB mod, i removed the two resistors from the foward part of the H-bridge circuit. It's really fast, and opens the way to higher motors like the DKS ones.

which two resistors did u remove, are there any diagrams or pics avaliable, and what is dks (I'm fairly new to these things)

Check the "Bit science" forums here. DKS is www.driftkingshop.com, where i got 2 batteries and some special motors. The DKS "Monkey Rotor" is my favorite.