Originally Posted by deadmancourt

im breaking in another GX5R and so far im past the break in but kept all the shims in and have run 2 FULL races with the break in shim in and am going to run 1 more race to make sure its ready and then i will remove the break in shim and 1 more copper shim!...this is how i have done 3 gx5r motors so far for me and my teamates and they run GREAT!