AFTER FINE TUNING! It’s not a joke mate! That’s 12,500 revolution per minute (rpm)! Actually it exceeds the top meter reading of only 12000 rpm... sorry it's a secrete mates...and the few things I could suggest is that don't throw away your kmx original exhaust down pipe, because it was computerized in Japan to suit your 125 cc engine. What the Japanese did is that they derestricted some of your kmx mechanism so that the warranty period will be reached and still the engine is in good condition. Don’t you know that 30% of the total power of your kmx can be within the exhaust system. Tips, decoked / decarbonized your original exhaust down pipe/front pipe and use shorty tail/end pipe. But remember that's only 1 of the many things to fine tune your kmx.