I have 450 miles on mine and I get a top speed of 61mph ever since breakin time over. I weigh 250# so I guess that is a good speed.
I wanted to put a YOSHIMURE exhaust muffler on the bike. They have had one for the 50cc super8 but not the 150. This past mo. they came out with one for the 150 but after talking with thier tech dept. today I will pass on buying a quote "preformance muffler" from them.
I asked the tech for a dyno print out to see if it really would do any thing (preformance wise) for the $350 price tag... I was told that it was "to small to fit on the dyno?" there for no preformance results were aviable or would be in the future !!!
I said wow so i pay 3 1/2 bills for a muffler that does nothing and they said " its for looks and sound only !!
Oh wow a do-nothing $350 piece of junk, just what we need ,right...
I was told by the shop I bought my scooter at that YOSHIMURE EXHAUST was the hot ticket item in racing/preformance mufflers.
I guess we as scooter riders don't qualify as a market that needs a little added zip in our bikes.