I have a 1978 puch maxi, 70cc,stuffie crank, bitubo, 19mm phbg, 16/35 gearing. carb has w7 needle, 30 slide, 85main, 45idle. the carb is wayy too rich. it bogs when you nail it full blast. will also foul the spark plug. if you milk it its ok. i even tried a 70 main and still did the same thing. need help please!!!