Rocketman1959:

Well, the Marui guys have found sometimes one track scrapes. check inside the track guards on both sides, and see if one track is rubbing anywhere. you may need to remove some styrene to get it to rotate freely.

An extreme way to check if its the motors is to swap them about, but thats not a very fun task. It ~is~ do-able without soldering, as you unplug the connectors from the board plugs, AFTER you note which ones went where, and checking what polarity they were (with a meter if you can)

If the problem switches sides, its the motors. Not much you can do though you CAN get replacement motors (and ones that sloe the tank down)

The guys here know the full trouble-shoot: http://groups.yahoo.com/group/MaruiTankGroup/

Hope that helps ya out.

WhiteWolf