because it was a slippy track last night and i had no decent tyres I tried to set up the car to have as much grip at the rear, so i lowered the back and used the inner hole on the towers. This leads me to believe it could have well been bottoming out on that high angle take off ramp like southwell suggested, cant remember what pistons are in, havent rebuilt for a while.
but you mention the motor thing, which could be the case because the car did have a drag-brake feel to it. Its good learning for me to hear all these tips
P.s Chris your b4 was going great on her maiden voyage, you enjoy 2wd?
cheers