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You can easily put a 150 kit on with no chance of damage, it will fit right in the crankcase, thats your best bet. Then upjet your carb to somewhere around 105. 160 kits and larger dont generally fit the crankcase without machining the case. you should be able to reach 65mph. And as far as break in, you do want to reach high rpms, for short periods of time, reach your top speed and then let go of the throttle.
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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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