Try to find an icat spark enhancer, I may have gotten the last one, it came out of Alaska. The icat acts like an after market ignition,and if your jetting is off it makes the bike more rideable. The 05-07 cr125 load up, you have to ride them hard, mid to top. I put a Rad valve in my 06 cr125, Boyeseen suggested jetting ,pilot 50-stock, stock needle, 410 main-leaner, I took the rad valve apart and polished the internals, I rode it 2 minutes in the grass, it,s snappier,noticable improvement low to mid. I would have to check my 06, I think I have a 37.5 pilot in it, stock needle,410 main, 110 leaded, 32.1 , I,ve been tuning my 04 cr151 lately.