Set up help needed.

[loose]

Hi, I've got a B4 which I run indoor, usually at York and soon at Batley. Being pretty new to racing I'm still coming to terms with setting it up right. I've found it handles much better when set up pretty soft, especially the rear, but the problem is the jumps. The motor cover isn't hard enough to totally protect the motor so on the jumps it copping for some of the impact. Its fine usually but I've had the occasional problem with the motor either dislodging slightly so the pinion doesn't mesh right, or even lost a motor screw altogether.

Should I just set up harder, or are there stiffer motor covers available? I notice pretty much everyone grounds over the jumps, does anyone have similar problems.

Basic question I know, but any tips appreciated.

Cheers.