I found some decent IRC NR 77 70/90 tires and some tubes on eBay. I have read that tubes can be off by a bit...
Aaaand....I don't fully inderstand the wiki for this.
Did I get the correct tubes? It says "60/100-14 2.25/2.50-14 Tire Inner Tube fr 50cc 70 90 110 125 150cc Dirt Pit Bike" for the tubes.
See pics attached