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Please help, I am new to these bikes, I bought an Agility 125 City and it's ok except that if I ride on full throttle and above 50mph after about a minute of riding fine... it cuts acceleration, taking the throttle off and back on puts it back on but then it cuts again, and again, and again until going about 30mph! It's driving me crackers! It has only done 1500km from new, anyone any idea please? I've spent hours looking for an answer to this online, to no avail.