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Post by prodigit on Jun 25, 2013 20:49:51 GMT -5
My roketa MC-05-127 with a sprocket change, actually has about the same gas mileage as the ATM50.
It's a 125cc, so better acceleration, and faster top speed (about 60-65MPH GPS verified)
I just did the calculation, but because I just purchased it, and only have like ~400 miles on it (650km), and at the beginning there's always the biggest cost needing to be gained back; the cost per mile is quite high.
Give me a few more months on that one, and the total cost will go down; to almost equal my ATM50.
For the MC-05-127 I did needed to invest in the sprocket, which was ~$50.
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Post by prodigit on Jun 25, 2013 20:32:30 GMT -5
You're welcome  Hope things work out on the sprocket, and bike. With a smaller rear sprocket, the engine does not go in such high revs, and might be running cooler; less oil splashing going on. I think it's possible that some of the oil got splashed out the crankcase, via the overfill drain. |
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Post by prodigit on Jun 25, 2013 3:26:32 GMT -5
Excluding my tools, following is true for my TAOTAO ATM50:
Purchase:
TaoTao ATM50: $599
Shipping: $149
Tag and taxes: $249
1 windshield: $49
SubTotal: $1050
Oil:
I have done 9 oilchanges. Each oil change is just under a quart. A gallon can host 5 oil changes, so that's $20/gal;
SubTotal: ~$30 on oil.
I've done 4800km, or just under 3000 miles, at ~$3,799/gal and an average of 98MPG.
That's ~30 gal of fuel, or
SubTotal: ~$115 on fuel
Total: $1195; rounded off = $1200
I did $0.39/mi, or 2,5 Mi/$
No insurance.
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Post by prodigit on Jun 25, 2013 3:00:11 GMT -5
@ averageguy: I have ridden 2 trips of 1 hour each, almost 2/3rd of the tour @ WOT, and have not experienced any oil leaks so far.
My only complaint is that the gas tank is empty so quickly. After 1,5 hours riding WOT, it has used 75% of it's tank (~0.8 gal), and needs to be fueled up again. I wished I could make use of the remaining gasoline, and at least get a 150Mile range
@ Copperdeer: I initially bought this bike to replace my ATM50.
And although Roketa accelerates much faster than the ATM, it's top speed stock was not significantly faster than my ATM50 (perhaps 5-10MPH faster).
With the sprocket change (I put a 34T in, but I would recommend a 36T for optimal power distribution), I get a gas mileage equal better than the ATM50, with added faster acceleration, and faster top speed (60-65MPH).
I've been contemplating changing the sprocket to a 31T for ultimate gas mileage.
Here's my reasoning:
A 34T should be considered an overdrive, as the top speed is close to the top speed of a 41T, and below the optimal sprocket of 36T.
On average, with a 33T, in 3rd gear, the bike acts like with a 41T in 4th gear.
If I switch down to a 31T sprocket, in 3rd gear, I will have similar performance of a 36T in 4th gear.
However 4th gear with a 31T, will be seriously overdriven. I'd probably be able to go ~45-50MPH tops with it in 4th gear, however in 3rd gear, the bike should have sufficient RPM's to go top speed of 65MPH.
Doing it this way, I could cruise around town 35-40MPH @ a reasonable 2k-3k RPM.
I'd probably ride in 1st, and 2nd in the city, and 3rd gear on the highway most of the time, and use 4th gear only when going in the suburbs on 35 to 45MPH roads, to save on gas.
It would be a cruising gear, much taller than an overdrive. Doing so, I should be able to attain the magic 120-125MPG; but also would have almost zero acceleration.
That gear would be good to keep me going at those speeds, as the 34T shows me it still has quite some acceleration between 30MPH and 40MPH.
Something peculiar about this engine is, that it has good low end torque. But unlike most chinese scoots, the higher the RPM's, the torque does not increase significantly, only very little.
I think it's optimum pull is between 2k and 4k RPM. Anything above 4k RPM has some extra power, but not that much more (like doubling the RPM's does not double the torque, only marginally increases it).
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Post by prodigit on Jun 25, 2013 1:14:49 GMT -5
Not saying I do. However I already adjusted it that way.
I tried making it run richer at idle, but without much success.
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Post by prodigit on Jun 25, 2013 1:12:48 GMT -5
If you're a dealer, you basically need to import a 20 or 30 scoot container, and expect there to be at least 2-4 returns (non working scoots), that can be used for parts.
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Post by prodigit on Jun 25, 2013 0:03:40 GMT -5
I've been stopped once, riding off the curb, by a cop.
You can't take no motorized vehicle on the sidewalks no matter what.
However, if you push it off the sidewalk I can't see anyone would object.
I've seen scoots being tied to a tree somewhere.
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Post by prodigit on Jun 25, 2013 0:01:42 GMT -5
It's already set up to idle perfectly.
From here the choke performs linearly with the throttle.
Best idle with choke @ 1/2. I could turn it off, but the AF adjustment screw is already optimal I think..?
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Post by prodigit on Jun 24, 2013 23:57:34 GMT -5
China labor also gets more expensive. As human rights groups gain ground, china laws and regulations are bound to become stricter.
When safety and health regulations go up, so does the manufacturing cost of plants.
Then also lawsuits for when plants broke those regulations. Good workers will get bonuses, bad workers just their pay, or laid off.
Just like US in the 1960's, when chinese kids see how their fathers worked their azzez off, to pay for rent, now kids grow up being able to afford cellphones, tv, internet, etc... and without working hard for it.
So when those kids go to factories, who haven't worked for anything they really didn't need; the efficiency of human labor goes down. They might even quit, where as their fathers would have sworn their lives to china, even if it costed their lives!
So labor efficiency goes down, cost of materials also goes up, which basically means you can expect a china scoot in a decade or two, to cost ~$2k.
Enjoy the prices while they last. I wouldn't worry too much about them. As their products become more expensive, so it becomes less interesting for companies to import from china, as product + shipping + import taxes > manufacture locally.
Not yet, but soon it will be.
mark my words, as soon as china is level to a first world country like USA, Japan, or Western Europe, other countries will follow.
China, India, Korea, Philipines (Yamaha has plants there), Vietnam, Taiwan (not much success there, they don't really make more than matchbox cars), ...
That whole region is being industrialized.
The last continent will be Africa, but I don't think they will ever get to be industrialized, because the general people there are too lazy; partly due to the hot and dry weather, partly due to no (or low) education.
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Post by prodigit on Jun 24, 2013 22:33:34 GMT -5
yeah. Idles fine. Only thing is when the engine is hot, idle is up by at least 500rpm from a cold engine. I kind of like it to be able to tune into the engine's best performance, with the choke.
I know I need to change the jets or carburetor.
The 2cc is not 2cc. I think the 127cc is the actual cc's, while most 125cc's usually are lower, like 115-120cc or something. It would make for >10cc's differece
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Post by prodigit on Jun 24, 2013 22:31:07 GMT -5
And according to poster above, they also start copying Japanese names.
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Post by prodigit on Jun 24, 2013 22:09:45 GMT -5
Ok, so when my bike is cold, I need to pull the choke lever to the left.
This (I presume) will richen the mixture in the beginning.
Once the engine heats up, I have to pull the lever to the right (closing the choke). This will lean out the mixture (I believe; tell me when I'm wrong).
So, now, when riding on a hot engine, and going slow, the bike performs noticeably better with the choke pulled halfway open.
I presume this suggests in a lean idle jet? (it's a mikuni carburetor).
When I'm going all out on the highway, the bike performs better with the choke around 1/4th pulled out (so I have to move the lever 1/4th to the right, for it to run leaner).
In other words, my 127cc bike, probably has a 125cc carburetor mounted to it. I presume therefor that the carburetor was not rejetted, causing the idle jet to be way too small (running too lean).
The main jet seems to run less lean, so maybe that was adjusted a bit, but not enough.
Am I right in my train of thought?
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Post by prodigit on Jun 24, 2013 21:55:35 GMT -5
Wrong A/F ratio?
Could be because of a clogged gasoline line or filter, or low on fuel in the tank.
I know my MC-05-127 shuts down when there's less than 25% fuel in the tank.
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Post by prodigit on Jun 24, 2013 21:52:41 GMT -5
Yamasaki would be more Japanese.
What would be Chinese would be like Pong Cheng, or Chin Tow.
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Post by prodigit on Jun 24, 2013 21:41:48 GMT -5
gitsum: Nice it works out for you. You're in the desert. I'm in hot and humid S florida, and even my Honda VT-750 starts corroding (and that's a real honda, not a korean or chinese model). I guess the humidity over there is just too low to start corroding. The one I have now, is 125cc, top speed of 60-65MPH (depending on the wind), and 100+MPG.
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