need help plz
 

hi i have the k1 it keeps riping the spur gear to sreds can anyone help thanks

Make sure your pushing down on motor when meshing and tightning also make dure the recess in the chassis is clean

If you are ripping the spur to shreds, you've either got the motor and main shaft misaligned. I.e. not parallel. Or you haven't meshed the pinion/spur correctly. (Or possibly the wrong pitch pinion)
All are easy to fix.

Or your bodyclip retaining your battery strap is hitting the spur gear...