Ok,
Bear with me here. This is probably old news to the folks that are experts on scooter and buggy motors, and I fully admit to being far from an expert in either. So, I guess before the GY6A there was a air cooled Honda motor called the KDU.. Now, Taida says they're similar but different, So lets take a look at the crank. Here we have your basic GY6 crank..
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2013 Trailmaster XRX 150 Type 86 stroker
Taida 4V head with 23/22mm valves, forged 4V piston,Taida 62mm jug,forged Taida 8200 KDU stroker crank, Koso high-flow oil pump, Taida case half w/ oil cooler ports, Setrab oil cooler,TrailTec Vapor, Mikuni VM26-606, aluminum 30mm intake, Uni filter, aluminum stack, Hammerhead racing exhaust, MotoRio adjustable CDI/HO Coil, Iridium plug, Full Dr Pulley CVT kit w/ 16g sliders, JD's Mikuni slide kit
2014 Kandi 90B
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