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Generally on a 50cc you will want light weight sliders (or rollers, but sliders are preferably), regardless of whether or not you are on a hilly terrain.
A 50cc can always use better acceleration.

Most 50cc's do with 5gram sliders (at least, that's what they recommended me for my ATM50).
There's really no need for any heavier sliders or rollers, unless you want better fuel economy, or are happy riding the 50cc at very low acceleration (like in a city with a lot of traffic jam).

However a stock 50cc engine performs 'fine' when it's accelerating above 6,5k RPM all across the line.

Just make sure you tighten the exhaust bolts. It works with a vinyl locking nut. On my 250cc, the vinyl would melt. On these ones atm they don't.
I have ~800km on mine, don't ride it a lot, I want to save it when I can.

I suppose you'd have to specify in the title that it's for a 150cc. 250cc's usually run farther and longer than eg: 50cc's.
Like some people have recorded almost 48k Miles on their 250's.
And I've seen many with 13+k miles on their TaoTao ATM50's. I myself am only at just under 3000 miles with only the blinkers as problems.

Too bad your EVO wasn't done well. Mine was done very well, save for front tire bounce which reduced after a good 150 miles riding.

+1

It takes nearly everything for a 150cc to get to 60MPH. You need to be in the torque band or else you won't even be able to get to 60.

Lower RPM's are only good to save on gasoline, if you're NOT in need of fast take offs, hill climbing, or high top speeds.

There's a sweet spot somewhere. If you install too tall gears, your top speed will go down. Too small and it will go down as well.
Since you want to go 60, and need faster take off / hill climbing, I can only hope you have a fuel injected scoot, or have a very lightweight body and scoot.
Most (stock) Chinese 150's reach only 55-58MPH. With some tweaking you might be able to get 65 out of them.

I don't know.. I think it's just stupid to assume that someone riding a car or motorcycle would hate a scootard.
I ride both bicycle, scooter, moped, motorcycle, and car, and I don't feel like I hate any of them.
I do see the dangers in all of them, and riding them all makes me a better rider/driver.

But sometimes I see people doing stupid and dangerous things,
Just the fact that on a 900CBR you can go 150+MPH, doesn't mean you should do it.
And those that do, definitely should not be zigzagging inbetween cars, even if it seems safe; it is not, and very disturbing.
The day more racers will enter the streets zigzagging, the chance will appear for 2 of them to hit each other and cause all kinds of problems for the riders behind them.

I don't dislike anyone, except if they're riding super slow or dangerous.

Riding a 50cc makes us usually pretty slow, but as long as you know your speed limit, and are not riding on 45MPH roads, when you can only do 35MPH, I have no problems with you.
Some scootards ride 25-35MPH on a 45-50MPH road, and are annoying as !
Especially if they could take a parallel road to the one they're riding which has a speed limit of 35-40MPH.

2-3 seconds. depends on rider's weight, rollers, fuel, engine limiters or restrictions, gearing etc...

Best you can do is keep on riding 20MPH, until the GPS is settled, and mark down that speed on your speedo.

I bought a chinese motorcycle, love it, though the carburetor is jetted incorrectly (way way way too lean), and is almost impossible to detach unless I demount the whole bike.

So far I have it 2 weeks, been able to run it on paint thinner, with the choke on.
It rides fun, accelerates fast, and probably will be a great bike once jetted correctly.
I would recommend not mine (which was only $1000 delivered), but a bigger one (usually ~1500-2000 delivered), because it's still half the price of a TU250x. Yes, finding a TU250x below $4,5k is almost impossible (at least in miami area), and dealers want to sell em too high, asking almost $6k for them, new.

I've got a lot of info, because I did a lot of research on those bikes; originally wanted to buy one, but have to agree, that it may be better to go with a chinese bike, for the same reasons that it might be better to go for a chinese scoot compared to a Japanese or Korean scoot.
Either that, or go with a Ninja 300. The ninja 300's are phenomenal bikes, with a very high power curve (almost twice the HP of the TU250x), and speed upto 100MPH (some modded 300's go almost 120MPH).
That's about as fast as my 750 cruiser goes.

The 300's are not made for long distances though. I've had a friend who broke one down on a 1000 mile tour; while a 500+cc bike is much more suited for long distances.
I've never tried a TU250x for long distances, but usually 30-60 minutes trips are ok on these bikes.

When they say 'does this all day long' it doesn't mean all day long. It means it can ride 70MPH just fine, but no one actually tried it all day long. They just estimate it like that.
My BMS260 could also do 75MPH 'all day long'; yet after 2k miles it started rambling apart.

I've done a lot of comparisons. The TU250x is a great bike; IMHO better than the S40, not only gasoline wise, but also because a sprocket change is a lot easier than changing a belt's gearing (which often costs ~$1,5-2k for a new belt system).

The Tu250x's are hard to find on the second hand market. Most people prefer the 2012 brown-golden models over all older or newer models (either red or silver).
But if you are looking for a second hand model, I'd say take a look at the burgmans, ninja's, and some other bikes sold for around that price range.