No need to fix something that isn't broke man. I have seen WAY to many Ka's last to 175,000 miles and beyond to even begin to think of a rebuild at a mere 130k. Hell....mine has close to 140k....perfect compression (as of 4,000 miles ago), burns no oil, gets 25 miles to the gallon, and I beat the living shit out of it almost every chance I get.....but...you can rebuild if ya want...if throwing cash away is your thing
-Bill