if you find no problem in gear boxes, then problems probably occurs outside gear boxes (it is nonsense , but it is the way to figure out problematic locations). such locations might be the shaft connecting front and rear gear box, swing shafts connecting gear boxes and wheels etc... all in all, you have to check through the transmission system.
how did you exactly file down the MR11? could you tell me exactly how to do it? which side to file down? there are two umbrella gear beside MR11... the oppsite side too..do i need to take care of that too? it called bevel gear L and R there.. thanks a lot c hing..
我無其他意見了.....我現在猜想...舊型車的C ring 因為"太幼"在車輪轉動時令MR15 產生遙擺....差速齒因而不能緊貼......引至"卡卡"聲...........我自己試過用手搖舊型車的MR15........它是会遙擺的..可能左右有虛位..相反新hotshot MR15用BD4大介子固定是比較緊,轉動時很貼近波箱............所以我才想出用BD4 換C ring