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Also some big bore kits have a piston that sits entirely too high, seen in a lot or mortch and growsun pistons, once the connecting rod heats up and expands the piston actually starts hitting the head, if you have this problem you would hear a pinging and instantly lose power, took me over 2000 bore kits and 5 years to find a good brand that wouldn't do this. Are you sure the valves are adjusted right, and adjusted TDC AFTER the compression stroke?
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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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