Originally posted by pau_kacang
. . . buttttttttttttttttttttt always got problem with 2nd speed. i already used mtx3 in 2 race, each race got same problem. . . . . .
I presume the 2 speed is locking itself in 2nd. gear, yeah?
What happens is that without sufficient gap between the shoes, the adaptor over rotates and immediately strips the grub screw threads.
Here's the fix as told to me by one of the local fast guys (rjl).
Using some new shoes (don't even bother with the old ones), tap the grub screw holes nearly all the way through so that there is a proper thread formed.
Install the grub screws and set the gap between the shoes to approx. 0.5mm each side.
Lightly lubricate the 3mm balls where they sit on the adaptor.
Use a little CA to lock the grub screws in position and don't touch them again.
Install the adjusting cap screws, springs etc. and adjust for proper engagement of 2nd. gear at the track.
We haven't had a problem since adopting this method. Good luck.