i pulled my speedometer and cut the ring off to get a look inside to make sure nothing was stuck in there. the speedometer reads wrong and hangs up. if i just push the bike somewhere it says i'm going 30 mph. i got the gear out of the housing but i don't see anything that is obviously wrong with it. any one got any tips? theres a weighted dome that the needle and gear connect to that moves freely but was covered into black junk. does this need to be lubed?