Originally Posted by Lgbzone

The problem is the rear of the chassis hitting the floor and bouncing up, the stock springs (which are actually orange but look red) are far too soft, change them for firmer ones, for example the red 68mm springs. now with the firmer springs it will be a bit over sprung, so it'll seem bouncy again, therefore up the weight of the oil to slow the movement down a bit. depending on the weight of your batteries; you will probably need around 8 to 10mm preload.

the springs can be seen here http://www.hpieurope.com/options.php...&partNo=103421
part number 67449 are stock orange ones and part 67452 are better red ones.

HTH