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Post by gitsum on Jul 5, 2013 12:40:08 GMT -5
....or just put in an upgraded crank and have cheap, easy to work on transportation WITHOUT brand name proprietary parts and high labor costs No, no, no!!!! Most Taiwanese budget scooters use generic GY6 parts. The engines are universally designed and can use both name brand and generic parts. You can easily do all of your own work just like on a Chinese scooter, so what high labor costs? A budget Taiwanese scooter is easier to work on. Fasteners, hoses, plastics, bolts, screws, cables, and gaskets are more robust and one doesn't have to expect that some of this will break just because you take it apart. More importantly critical engine, exhaust and transmission components are a better quality metal and stripping out bolts is less of a risk.
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Post by gitsum on Jul 5, 2013 11:08:24 GMT -5
Yes, some of the name brand scooters use very proprietary parts that can be difficult to find. This is one of the main reasons I sold my SYM HD200 EVO, which gave me over 5000 miles of flawless service in one year. But with a little bit of research you can find many Taiwanese scooter models that use a very generic GY6 design. Parts are universal and easy to find. You can buy Taiwanese/Japanese parts or cheaper Chinese parts
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Post by gitsum on Jul 4, 2013 23:58:08 GMT -5
I'm not bashing cheap Chinese bikes. They are what they are. I'm bashing people that try to make them into something they are not. When I bought my first Chinese scooter, that was all I could afford (the first of two). I worked on it like everybody else (too much) and kept it running. But unlike a lot of people here, I knew my Chinese scooter was not the best quality and had no illusions it was as good as a Genuine or Kymco, which were very popular scooters at the time. But back then a quality scooter would set you back $3000. Now there are several budget Taiwanese models that cost just a few hundred dollars more than a Znen. Without ever having owned a "budget" Taiwanese model, some people on this forum keep saying their "better" Chinese scooters are just as good. I have owned both, and just about anyone that has knows there is a big difference. The point of a much lower cost of purchasing a Chinese scooter just isn't valid anymore. This includes some brand new Taiwanese machines, not just getting lucky and finding a good deal on a used Japanese scooter. There are many threads in this forum where people are asking advice on how to fix their Chinese scooters, some of them very frustrated. There are many threads in this forum where people ask for purchasing advice. It seems if a non-Chinese solution is suggested, there are many people here that just have to bash it and put it down. What's good for the goose is good for the gander. And when the shoe is on the other foot, some of those very same people really don't like it
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Post by gitsum on Jul 4, 2013 15:02:12 GMT -5
Yes, this is done by either gearing or a rev-limiter, or both.
I prefer using gearing to limit maximum engine speed on a scooter. If the CVT is tuned properly, you will run out of horsepower to push the scooter faster somewhere between the torque and horsepower peaks of the engine's powerband. Running WOT will keep the engine below the redline, unlike a rev-limited top speed where the engine is running all the way at the redline.
It seems like a lot of 150cc scooters are top speed limited by gearing, while a lot of 50cc scooters are top speed limited by rev-limiter. Probably because of the larger 150cc having a much fatter torque band, compared to a 50cc which makes most of its power at higher rpm's.
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Post by gitsum on Jul 4, 2013 14:36:57 GMT -5
I think you hit on the very core of the problem Gitsum. a smaller engine needs to run harder and more rpms to produce the same power and speed that a bigger engine does at half the rpms... Good point. If you own a smaller four-stroke 50cc and ride it consistently in a 45 mph speed zone, it would be WOT all of the time. A 150cc engine would be running easily and well below the redline under the same conditions, and as a result would have a longer engine life. But according to my theory, if you ran the 150cc in a 65 mph zone at WOT throttle all of the time, you would stress the engine harder than running a smaller 50cc engine at WOT. If both engines were a GY6 design made out of the same metal, the 150cc should wear out first because of the additional power and stress. However, both a quality made 50cc and 150cc engine should last a long time abused at WOT if the maintenance is kept up.
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Post by gitsum on Jul 4, 2013 13:42:07 GMT -5
A smaller engine produces less power, heat, friction, stress, and centrifugal force. Unless there is an inherent design flaw, a smaller engine should be able to run WOT for extended periods better than a larger one. This being true if the metal quality and engineering design are respectively equal.
You can't compare a smaller GM 2.4 liter economy engine with a million dollar Ferrari V12 model and expect the smaller engine to maintain the redline with the same durability as the much more expensive larger engine.
But I think we are talking more or less about a basic GY6 design. Perhaps it's just bad luck with the Kymco 50's you've seen?
Maybe they are modified/derestricted and running a higher rpm than originally designed for?
Maybe a faulty batch of crankshafts were installed and you happen to see more than one?
For the most part, change the oil and keep the valves adjusted and Kymco air-cooled engines last quite a long time.
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Post by gitsum on Jul 4, 2013 12:57:16 GMT -5
Hey gitsum, Did you ever buy anything BRAND NEW? All your bragging about your rides, THEY ARE ALL USED- somebody elses leftovers. I but my stuff new. and it so happens that i could own any bike i choose NEW> I choose a chinese scooter because For what they are, they are a great valye If I was bragging, it wasn't intentional, just trying to show what a value a lightly used quality machine can be compared to buying Chinese. I would never be as uncouth as you to state that "I could buy any bike I choose new". But since you asked, here goes. Since 2010 I have bought a new 2010 Honda Elite 110, new 2012 SYM Wolf Classic 150, new leftover 2009 Suzuki TU250X, new 2012 SYM HD200 EVO, new 2012 CPI Oliver City 50, new 2012 Tomos Nitro 150 and a new Honda CBR250R. And since you were making a point about your claimed ability to "buy any bike you choose new", I paid cash money for all of them, except the 2012 CBR250R, which I financed for my son and he makes the payments. If you would have just looked at the machines in my signature, you could have saved yourself the embarrassment of looking like a wanna be stuck up person. And if you're not embarrassed that's OK, 'cuz I feel embarrassed for you ;D
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Post by gitsum on Jul 4, 2013 11:23:29 GMT -5
OK Tommy, fair enough. I've got about 1000 miles on my Tomos Nitro 150 so far, we'll see how it goes. I've installed some Dr. Pulley sliders and my Sportech windshield that I took off my previous SYM HD200 EVO, that's it. She'll hit 60+ mph (actual) on level ground with two riders, I've been averaging to mpg. We been on several trips over 200 miles, cruising 50 - 55 mph two-up in temps approaching 100 degrees. We've taken the Tomos Nitro off road into some pretty remote places, no worries. And yes, you can maintain or mod a Taiwanese or Japanese scooter just like a Chinese scooter. It's just that you don't have to do anything more than an oil change or occasional valve job to keep them running reliably, and not much of a chance of getting stranded and having to haul them home. That's really important if you tour like we do on our scooters, we covered up to 350 miles in one day. I never felt confident traveling more than 50 miles from home on my Chinese scooters. They worked better for running errands or a short commute to and from work. I would never trust them to tour long distances out to the middle of nowhere The Tomos Nitro 150 made by SYM, and assembled in their mainland China plant. If you not sure what a SYM is, just google it. SYM sells more scooters in the overseas market then Kymco, PGO (Genuine), Adly, or TGB, and there's a good reason for that. I think you going to end up regretting your purchase, $999 for a Tomos Nitro 150 (new) is the deal of the century!
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Post by gitsum on Jul 4, 2013 10:53:51 GMT -5
I don't recall reading any agenda about this forum being "geared towards Chinese", after all the name of this forum is "It IS the Ride". This forum seems to be geared towards helping and giving advice on how to fix scooters. It just so happens that a disproportionate amount of the threads are about fixing Chinese made scooters, I wonder why? You think $800 was a good deal on a Chinese 50cc? Think again. I bought a 2007 Yamaha C3 with 750 miles for $1000. It was three years old and looked brand new without a scratch. 44 mph top speed and 115 mpg. Water-cooled and fuel injected, you could literally cruise at WOT forever, It was almost as fast as my two-stroke SYM DD50 that I bought for $500. Yeah, that's right, a Taiwanese built 49cc two-stroke with 1200 miles that I fixed up and invested $700 total into and it ran 47 mph. The Yamaha C3 ran perfectly for the couple of years I owned it and never needed anything but oil changes. I sold that terrific little scooter for $800. Beat that deal with an $800 Chinese 49cc. And yes, I sold the SYM DD50 for the same $500 I paid for it. I am on a crusade. I am sick and tired of people who buy Chinese scooters insisting on two things. 1. They are as good or almost as good as a Taiwanese or Japanese equivalent. 2. They are a better deal and save money. I think almost all of the people that claim these two things have only owned a Chinese machine and just don't get it. I myself owned two Chinese scooters and figured out they don't save money. I have also owned more than a dozen Taiwanese or Japanese scooters/motorcycles and do all of my own maintenance and repairs. Kymco, SYM and Tomos all make Taiwanese manufactured scooters that are assembled in China. I don't know how many times I see people here willing to spend a few extra hundred dollars on a Chinese made Znen to get better quality. And yet they are unwilling to spend a few hundred more to get a budget Taiwanese machine that is a much bigger jump in quality? At this point I'm almost ready to give up explaining that buying a cheap Chinese scooter rarely saves money. I said almost ;D And let's not forget to mention the infamous Chinese PDI. You take a brand new Chinese scooter and replace some of the essential parts and then hope that it keeps running with some degree of reliability. I don't know exactly when people began to accept buying something brand new that was broken and didn't work correctly, and then were happy about it? Looks like those Chinese are way smarter than a lot of Americans! (Or at least a lot of people here ) There nothing wrong with buying a Chinese scooter for a cheap price. I'm not sure that's the smart thing to do, but if you're a decent scooter mechanic with extra time and lots of patience, it might work out OK for you. But it is wrong to try and justify the purchase of a Chinese machine by trying to convince people (or yourselves) that they are something they just aren't!
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Post by gitsum on Jul 3, 2013 11:38:25 GMT -5
I put 16000 miles on my last one. only thing i replaced was 1 belt 6 roller weights and several bottles of oil. Oh and a couple of plugs. Drove it in summer &winter It only became a little unreliable toward the end, so I bought another. I still have it though. Lets see.... $800.00, &7 yrs of riding it ,16000 miles.Boy, It must've been a real JUNK!!!! It was a BAJA sc50 with the QUINGJANG motor. Maybe you can give more details? You said you rode it 16000 miles with only a drive belt and roller weights replaced, but then it became a little unreliable toward the end? If you would have rode it 16000 miles in one year, would that still be a good deal?
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Post by gitsum on Jun 25, 2013 10:39:30 GMT -5
After the engine is warm, you should never need to run with the choke open. This indicates a lean condition.
If the idle and 1/4 or less throttle runs better with the choke partially on, you need to adjust the fuel mixture richer or switch to one size larger pilot jet.
For 1/4 to 3/4 throttle, raise the slide needle one or two notches or add a shim.
For 3/4 to WOT, switch to a larger main jet.
It's actually not quite as simple as that, but this will get you started in the right direction. It takes a lot of trial and error to get it perfect...
If your carb is faulty or not the correct size for the engine, it will never run right. If the airbox/intake is too large for your set up, it will never run right.
You need to check for vacuum leaks and/or air leaks in the intake manifold and upstream towards the airbox, especially where the intake hose attaches to the carb.
These things are definitely possible when you buy a really cheap Chinese motorcycle/scooter...
I give you credit for still trying. I would have never bought it in the first place. But if I had, it would already be thrown out in the junkyard or landfill.
Just think, what if you would have applied all of these hours you've been working on this project to a temporary job or overtime at your regular job? With the extra money you could have made a much better purchase.
Was it worth it and did your really save any money?
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Post by gitsum on Jun 23, 2013 11:16:43 GMT -5
I love the sym, but at $3k it's not really worth it; Besides all that chrome is actually steel, and going to rust in a few weeks! But I don't think it's worth the 3k price! Wow, you sure know a lot about something you never owned! I did own one, and it was worth $3000. No rust ever, mpg and 70 mph top speed. It never broke, and ran like a champion from the beginning without replacing or fixing anything. It had a very nice suspension and handled really well. A fun, reliable and economical machine that will keep running for a long time...
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Post by gitsum on Jun 22, 2013 13:22:40 GMT -5
Tomos is manufactured by SYM and assembled at their mainland China plant, along with Lance scooters and several lower priced SYM models.
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Post by gitsum on Jun 16, 2013 10:29:57 GMT -5
Stella two-stroke is an awesome machine, good choice!
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Post by gitsum on Jun 13, 2013 22:18:50 GMT -5
Kymco Agility 125 Lance Cali Classic 125 or Havana 125 Tomos Nitro 150
All of these can be had new for under $2000
They are all Taiwanese manufactured scooters assembled in a Chinese factory to reduce costs.
These scooters are more than fast enough to get you into trouble or worse.
Investing in a motorcycle safety class would be a very good idea, and you will get a discount on motorcycle/scooter insurance.
There are some 50cc models that will reach 40+ mph, it depends on where and how you are going to ride.
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