Hi Robsta,
Could be one of the following things if you bought this as a used car.
1. Remove one of the wheels on your car, When you can see the drive axle stub, there should be a small metal pin that goes through the stub - this locates into a recess in the back of the wheel - without it The wheels will turn when you hold the car up in the air but when you put it on the ground you will have very little or no drive.
Check the other 3 wheels for same. The pins are cheap or can be very easily made from a short length of piano wire - available from most model shops. These pins can drop out very easily if your wheels are not tightened up properly - and the problem can be a pain to find (Been there and done it !!!)
Next thing to check is:
2. You may have worn clutch shoes, They are generally only plastic and do wear down after a while. You will need to remove the engine and the drive gear to check the clutch shoes. They are cheap and very easy to replace.
And last but not least - if the above 2 have not cured the problem - the last thing to check is:
3. You may have a worn Diff - Again this is cheap enough to replace as a whole unit.
If you need the parts diagram for this car let me know and I will paste it up - very handy for obtaining new parts as it has all the part numbers on it.
Hope this helps and Happy running !!
Regards.......Mark.
