Neil, I do not have a solution, but however have the same exact problem. Son got an E300 for Christmas. My daughter also received an E200. The E200 works fine, but the E300 makes a clunking noise when the throttle is engaged. Also the E200 can make it easily up the drive way, but the larger and more powerful E300 can not. Any help with this would be greatly appreciated. Thanks, Ron -
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