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@Teddy: I've never claimed to have a secret 63. I've never been able to verify that myself. There is a chance that I have a larger than 49cc displacement, but don't know if it's 63cc. From the manual I have a 55,7cc. On paper it's a 49cc.
@TDSJ: Yes, same motor, perhaps same CVT too. Though many users who bought their AMT50's with build after 09/2012 have said to easily reach speeds over 42, and I've found 3 other people who's speedometer indicated speeds of greater than 48MPH (the speedometer below the blinker light on the dash).
However, going from 35MPH to 40 takes time, and even longer to go to 45MPH.
And only on a good day will you be able to get to 50+ MPH (like little wind in back).
I've noted that the ATM, when it warms up, it gets faster to those speeds. I've also noted, that it warms up faster with acceleration to top speed, engine brake to standstill, and repeat that process for a few times. On my rides, I often was riding on a 40-45MPH road top speed, and by the time I reached top speed, had to (engine brake) to the next red light. Do that 3 or 4 times, and the ATM accelerates much faster, and can get to 50+MPH within 1 minute.
I say 53MPH, but it's rather ~52 or 51MPH GPS verified.
I got these results using 10W40 oil, BP Premium gasoline (by which I swear it adds at least 10%,if not 20% of performance compared to other gasolines out there), and reduced my spark plug gap to 0.10"(0.254mm) (from stock 0.25" (0.635mm) spacing).
I do have a windshield installed, but I don't claim any speed gains with it.
I personally did not needed to change anything on my ATM50. The spark plug shows no signs of running lean or rich, does wear out a bit every 1000 miles, but it's easy to adjust the gapping, the belt is as good as new after +2k miles, probably can run 6 or 8k miles with the stock belt. Hoses are still good after 6+ months in the elements (hot Florida sun and rain).
Can't speak for VIP, but on the ATM it's entirely unnecessary to replace carb or belt (at least on mine).
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