I've sent a request E-mail to a supplier of the BX 125 for pricing and availabilty of the sprocket drive, and do they carry different tooth counts. My assumption was that the Howhit GY6 motors were made made by Lin Hai, the BX 125 says it's supplied from HSP DKM ? Haven't figured out who makes it yet. But I can definiely verify that you can swap these sprockets and that the increase was just over a mile an hour per tooth and only took 5 mins. to do. Also I can't feel any difference in the torque when climbing the hills on our trails either. The 125 motor is only rated @ 6.5 hp. By the way the sprocket drive is #27511-DP200 from the BX 125 parts breakdown list. I'll post the price and availabilty as soon as I get a response for anyone else that wants this mod.
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