new to forum, hi everyone

hi everyone, i'm new to the forum and to southern california. i have a 48cc boardtrack bike. i was riding it to work yesterday and the chain broke. are there any bike shops that carry parts for motorized bikes, preferably in the inland empire area. or does everyone just get stuff online? also, are you allowed to ride on the sidewalk if there is no bike lane present (even with engine on)? or is this another state with grey-area motorized bike legislation, lumped in with mopeds, carrying around proof that you aren't required to register, turning them off around cops, etc... any input would be greatly appreciated. thanks //jess

thanks MB. i'll make some calls and check out a hardware store. my original chain was 1/2 x 1/8 114. is this a common one? hmmm, i guess i better look into the CARB laws, not familiar with them. i'll have to use the pedals mostly and only gas it up the hills inconspicuously until i find out more.