In my case, I had 4 taxis. Three ran at the same speed, the forth was Mr. Zippy. I tried weights but it didn't work on the light weight EZ Street taxi. I concluded it was due to motor variation as Stan stated in item (1) above. I' guessing Mr. Zippy was from a different lot of motors. I bought Mr. Zippy as a separate purchase from a different retailor. The other 3 taxis I purchased on single order and most likely came from the same manufactures shipping carton.
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