I've searched through the old threads of puting lifan 90's, 110's and even the 125cc engines, but they have a new 138cc lifan engine that is oil cooled, and I was wondering if this would clear the front fender and wheel. Would there be room for the oil cooler, or is the 125 as big as you can go? Also, are the honda ATC70 pistons interchangable if you can find the right bore size?