does your zip do this?!?

[dr1zz]

i have 2 zips, and they both lose significant speed when turning to the right.....left turning is fine, and they both turn w/same radius

i thot it was wheel rub, so i removed the shells and it still slows down only with right turns.

i tried different gear sets........same
different axles........same
different tires.......same
put the matchstick mod under the rear axle........same
lube with air grease.......same
microsizer wheels all around........same
pullback wheels all around........same
different batts.....same
different motors.......same
it is very noticable with faster motors....NX3.4 and king 4.2, even 28k

anybody got a schematic of the pcb?