A new RM125 would be better! I always liked the idea of an elderly 125 class, no punks. But to have one and race it, sounds like some high maintenance. Then add in a vintage model with questionable parts availability. It sure bummed me out on the 370, but that crank should last longer! It takes a certain amount of finesse to make a 125 scream in the meat of the power-band for 20 minutes. I could last to the 3rd corner! It would take a lot more seat time to get comfy racing it. Hence the big bore fleet accumulating. AHRMA racing in Michigan? Vintage Bob