I think I need to change the transmission fluid in my 2001 Tomos Targa, since it makes quite a bit of noise before finally shifting from first to second gear, and it won't shift going uphill. I found the drain plug on the underside of the tranny, but where do you add the new oil? I took off the plastic guards, but still couldn't find a fill point. Do I have to strip off the carb or something? Please help!