tank urban sporty 2005 50cc 4-stroke engine, and hold the bad comments on that. New spark plug, clean air filter, clean carb, no hose leaks. I used to get it to about 40-45 on average(50-55 downhill with wind!) and only slowed to about 35mph uphill. Now, I have to drive it forever, like it has to warm up for eternity. If I let it warm up for 5 minutes, it will pick up decently( not the greatest) to about 30 luckily, and it just slows til about 10mph until i let the throttle go and it will die out. Then I start it again, and it will do the same thing. Usually the 3rd or 4th time it wont slow down near as much(10mph), and will pick up a little faster, and will have a slightly higher top speed- maybe 35mph. After riding for about 7 miles or so, it will eventually do 40 sometimes but never much more even downhill!!! I just don't get it. And for some reason it will slow down to about 20mph or 15mph for awhile. Its like this- Start- ride dies out, Start again ride dies out, Start ride and wont die but goes about 10mph for awhile- get to stop sign and no matter how much gas i give it, it will die out. Repeat last sentence. Start ride and wont die picks up nicely gets to about 35 for about a 1/4 mile or even a mile, and then it slows to about 20 mph. It seems like once it slows down to 20mph and then i stop it wants to die. But once i take off and accelerate again it gets up to 35 again- BUT IT NEVER STAYS AT SPEED IT WAS BEFORE(40-45MPH) or THE SPEED IT HAS BEEN LATELY(35MPH) cuz it slows down to like 20-- not just uphill... ON FLATLAND. I hate this c**p. Im eventually gonna take it in to get fixed, but just don't want to pay the 200 dollars to have him look at it(charge) and fix it(another charge). New fuel filter i bought, carb jets are clean.
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