| waarblin, rule number 1 please give your engine time to run-in, i hope you are doing this. the run-in mix should be 25 to 1 non synthetic oil. use atleast 4 tanks of fuel before opening up the throttle fully. then go to no more than 40 to 1 using full synthetic oil [motul 800 or simular] fit an ngkbm7a sparkplug then you can change your front engine sproket to a 7 tooth, a 68 tooth on rear should be ok. by the way change your stock fuel filter and hose with something better than the chinese rubbish. | 
