Yup, id replace that cracked/rotten section. I chased carb issues for two months to find the rubber connector from the intake to the carb was torn. The connector would seal fine and look fine when the buggy was still, but once I started riding it would open up, causing all sorts of issues. Plus, if the previous owner lived/rode at different altitudes, the carb jetting may need to be looked at. Just my two cents.. 
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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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