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Post by prodigit on Jul 7, 2013 19:13:31 GMT -5
To go on the interstate with a 250 is pushing it.
It's not only because of power, but because most these bikes are running at the tops of their revs going 75-80MPH, which wears them out faster.
For that reason a 500cc is recommended, because you can gear a 500cc bike so that you'll be riding at 3-3,5k RPM going 70MPH, and 5k rpm going 100MPH, where most bikes would probably top out.
Sure, a 250 can do it. I even take my 127cc Roketa on the highways, though I'm barely making 55-65MPH, depending on the wind.
My 150cc is noticeably more powerful, but it's geared lower, it's top speed is 60MPH, so it's less affected by head winds., but with a strong head wind, and up a bridge, my speed could drop to 45MPH. Just as long as you can maintain 40 on the highways, or 50MPH on the interstate, you could ride there, even if it's with a 50cc with BBK installed that's geared right.
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Post by prodigit on Jul 7, 2013 4:34:44 GMT -5
I'm thinking of putting a performance exhaust on my EVO150. The current muffler muffles very well, but I think it still has too much back pressure. On a cold engine it goes only 50MPH, on a hot engine 60. I think, but am not sure, that the engine is actually running a bit on the rich side; as BP Premium gasoline does not give a significant performance boost over regular on this bike. A bit yes, but not much. I want a cheap exhaust (I found $75 exhausts, not sure if they would fit though), preferably one with little chrome or metallic parts that can rust, that would fit the bike. www.amazon.com/150cc-Scooter-Performance-Exhaust-Black/dp/B005M30IUCWhich exhaust should I get? |
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Post by prodigit on Jul 7, 2013 4:17:52 GMT -5
probably running a bit on the lean side, nothing to worry about. In deceleration it is normal.
It could also be because of a gasket leak, however if that be the case the bike would sound really sharp.
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Post by prodigit on Jul 7, 2013 2:05:05 GMT -5
Puttin some chrome on it, 30in rims with thin tires, dragster, floating above the road, and other stupid stuff like that  |
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Post by prodigit on Jul 7, 2013 1:11:15 GMT -5
For a car it's much easier, because every gear passes Neutral.
But for a bike it's a dangerous thing!
Upshifting is easy, downshifting is hard.
You got to rev up, and gear tooth can chip when not connecting fast enough, resulting in gear problems.
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Post by prodigit on Jul 7, 2013 1:03:36 GMT -5
I just received my 31T rear sprocket, and it's a tiny M'a'F'a!
I'll try to install it this week and see how riding goes!
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Post by prodigit on Jul 7, 2013 0:59:17 GMT -5
A harley pulley may not fit a suzuki. Gotta be careful with just typing in 'pulleys'.
Another, it may be the exact same size as your current, thus useless.
Also, the rear pulley costs money, seeing that the front one (which is tiny) already costs 150 (compare that to a $35-$50 15-17T front sprocket, and a $50-75 36-46T rear sprocket.
The stock pulleys are cheaper; they usually fit the motorcycles that use the same mounting system.
But once you want to go out of stock specs, they're harder to get.
About changing to a sprocket, that would be a great idea! The S40, chain driven, you could do a lot of MPG mods on that one, especially because the chain is so much smaller than the belt.
Only issue I see is finding a good chain guard...
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Post by prodigit on Jul 6, 2013 16:29:49 GMT -5
nice  |
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Post by prodigit on Jul 6, 2013 16:25:16 GMT -5
I like the belt drive, but in order to change gear ratio on a belt drive, it's gonna cost about $1,5-$2k (yeah, you heard that right, about 1/3rd the price of the bike, to get 2 other belt discs installed) I'm not going to bother to research this, but I can't possibly see why it would cost so much. They sell aftermarket belt pulleys for less than $50. Get a smaller rear and you only need one, no clearance issues. Buy the appropriate size drive belt and your done. If need be you could get your local speed/machine shop to fabricate one. Worst case scenario would be a couple of hundred bucks at most. They don't sell those type of pulleys. They use custom mounts, so they're expensive. most of them are real chrome pulleys. so they are expensive. you also need to find 2 pulleys, not one, to make sure the belt fits (increase the front my 3 ribs, and decrease the back by 1) |
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Post by prodigit on Jul 6, 2013 16:23:02 GMT -5
Most bikes have 5 gears tops.
Only unusually large bikes have 6 gears, or they have 5 gears and a reverse (also called 6 gears).
It's the only reason I like bikes with a chain, because a sprocket change is so easy to do on them.
Also the bad about cars, is that there is no easy solution for them, to up the gearing.
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Post by prodigit on Jul 6, 2013 16:06:54 GMT -5
The TU is known to be geared too high. A sprocket change could give you better top end. Also, it's a single cylinder. From the specs, it's more fuel efficient, but has less torque than the dual cylinder Honda. It's only to be expected... Just for reference, my 127cc sports bike rides between 55 and 65MPH depending on the wind, so your 250cc, being double the cc's, can definitely go faster than 60MPH! It's common knowledge, with every bike, that you run at top revs, WOT, that MPG goes down, not up. Like said, do a sprocket change, say from 40T to 36T, and you should have 10% better MPG, and most likely between 5% and 10% higher top speed. OK, let's try to get this straightened out. First of all the Suzuki TU250x is geared a bit too low, not high. Lower gearing requires higher rpm's to maintain the same speed. A single cylinder engine that is the same displacement as a twin has more torque, because it has a larger cylinder/piston. One large piston has more torque than two small pistons. That's why dirt bikes are all thumpers. Where did Honda get into this? The Virago/V-Star 250 is a Yamaha. There are some bikes that are geared quite tall, so running WOT does not produce maximum revs and does not cause a dramatic drop in MPG. Taller gearing does not always guarantee better gas mileage. If your bike is geared relatively low and doesn't have much torque, and you ride it mostly in stop and go city conditions, taller gearing will not help gas mileage. If your bike has plenty of power to push the taller gearing efficiently, then it will help fuel consumption, especially at higher speeds. If your bike can't spin the engine up to the horsepower peak in top gear, taller gearing will reduce your top speed. And whoever said the TU250x was struggling to maintain 60 mph, are you sure that wasn't the Suzuki GZ250? Yes, I meant low geared instead of high, used a wrong word. 2- Single cylinder has less HP, less high RPM, less torque in the high revs. 3- I don't see where I talked about Honda in this post; and if I did before, it's just to compare. 4- Running WOT on ANY bike causes a DROP in MPG! Don't know where you got your info from, but it's clearly incorrect! Ideal MPG is in highest gear, ~35-45MPH. Anything below or above lowers MPG. 5- Taller gearing almost ALWAYS guarantees better gas mileage, under these conditions: a- You're riding, not constantly start-stop traffic, but even in start stop traffic, taller gearing lowers MPG very little, especially compared to the gain you get at higher MPH's. b- Your RPM is as close to ~1700-2000RPM without lugging the engine. 6- Not necessarily true. You can always upshift and get in the torque band, and use the final gear as an OVERDRIVE! It's been used since the '60's, it just requires the rider to have more than a peabrain, and upshift to second last gear in order to reach for top speed, if needed. But very few times does one really need top speed out of a bike. Anything above a 150cc, generally has sufficient speed to surpass the speed limits on level ground, since the interstate is about the fastest road in the country, where top speed is capped at 60MPH (even though people are going 80 on it). If you want to go 80, get a 250, if you want to go 100, get a 500-600cc bike. |
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Post by prodigit on Jul 6, 2013 3:04:55 GMT -5
The silver ones are basically the only ones sold right now.
If I'm correct only the 2012 models where goldenbrown, the 2013 models are silver.
I prefer brown,
Before 2012 there was silver and red. Not so fond of red.
I think in 2014 they will come out with yet another color (I presume red again), so if you want silver, better make sure you can get the '13 model while it's still in stock!
One level up from the TU250x, is the S40.
The S40 is 600+cc, single cylinder.
MPG isn't as good though, but looks are very similar.
I like the belt drive, but in order to change gear ratio on a belt drive, it's gonna cost about $1,5-$2k (yeah, you heard that right, about 1/3rd the price of the bike, to get 2 other belt discs installed)
The MPG's of the 650 is not very good, in the high sixties, but if they ever get a fuel injected version of it it could reach close to the 80's.
I like belt drive, but not when the gear ratio's are bad.
I like long gears, less shifting, higher final gear, gives a better cruise gear, for lower RPM while on the highway.
The engine is too big for the bike though. Many people said the S40 vibrates too much at high speeds.
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Post by prodigit on Jul 5, 2013 23:15:35 GMT -5
Happens a lot on my 150cc. Less on my 50cc.
I think the motor is mounted on the part of the frame where the rear wheel is mounted on (I suppose the rear fork or rear mount.
by braking the engine vibrations get directly transferred from the arm (rear fork, lack of words to say), to the rear wheel, while without braking those vibrations will be cushioned by the free rotating wheel.
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Post by prodigit on Jul 5, 2013 19:55:06 GMT -5
One thing to keep in mind the Roketa mc-05-127 is ONLY $1050 delivered at your doorstep, they go for $799. Nothing beats that price, not even the TUX.
For the price of the TU, you can get 4 motorcycles like the 127.
Second, since my 127, essentially being half the cc's, as it's jets are running a bit on the lean side, and the TU has fuel injection, which means if their cylinders are 250cc, the A/F that gets injected in it is more than 250cc of a carburetor (because instead of being sucked in the cylinder, it gets injected under high pressure, so more mixture will get into it),;
The 127 can do 65MPH tops (when leaning forward), 60MPH average tops on level ground sitting normal, I don't think that the TU will barely be able to maintain 65.
I think it's top speed is closer between 70 and 75MPH.
The Fuel injected BMS TBX 260 actually got 80MPH, and that one got a CVT, no manual gears (but it is more aerodynamic).
So, the TU can do much more than that.
Some people have reported 85MPH on the tux with sprocket change and leaning forward.
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Post by prodigit on Jul 5, 2013 3:48:34 GMT -5
Have you ever looked at torque and horsepower curves for motorcycles digit? Yes? On the same bike they are,but they are different from bike to bike. |
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