I don't think you need to change the swingarm in order to run a 130 tire, so I wouldn't bother. Unless, you wanted to go with somethin like an alluminum one to look cool. In that case I have kinda looked on ebay at CR125 swingarms and they might be able to be made to work.
As far as rearets go, get out the search function on this board case they have been discussed plenty of times and there are lots of good ideas already posted.
Ken
AHRMA 412
Vintage racing - old guys on old bikes
As far as rearets go, get out the search function on this board case they have been discussed plenty of times and there are lots of good ideas already posted.
Ken
AHRMA 412
Vintage racing - old guys on old bikes