is it a new barb? for a 72cc you should try an 85 jet. if its popping during de-accel you might need to rebuild the accelerator pump, scrappy dog has a rebuild kit now. check your pilot jet might be too small, 72cc will need a #34
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2012 Jonway X
44mm Hoca crank
52mm Hoca big bore
MMS big valve head raised ports, polished, milled .023
Hoca 26mm carb
NCY titanium valve springs
NOS wet nitrous system
Holley fuel pump
MMS variator
Naraku CDI
HT coil
4' Wheelie bar
MMG stainless slip-on exhaust
NGK "11" spark plug
UNI filter
2014 Icebear Maddog
too much to list
http://mmsscooters.com
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