all i can say even if the meshing is correct,if you push it hard and bash hard it doesnt matter how its set up its going to strip spur unless you got the slipper clutch way to loose for anything to run good,i,ve got mine tightened all the way because i found the slipper clutch doesnt work for me to begin with.
ORIGINAL: adz06
steel spur gear reduce your speed quite a bit and may cause ur clutch bell to wear i woul stick with the plastic just get mesh correct