Chinascooter

Parallel to all the fun I'm having with the 750, I am also fixing a plastic craptastic no-name Chinese scooter.

This thing really is all plastic. There is staggeringly little metal in it. The motor is a two-stroke with an oil tank. I was very surprised to find a "made in japan" carburetor and an actual NGK plug in it.

There are also some seriously bizarre things about it. Like, the fact that it beeps like a garbage truck backing up when you turn on the turn flasher. Or, the fact that it has what looks like an alarm module. Which you can unplug, and with it unplugged you can start it perfectly fine, but you cannot shut it down.

I've replaced the leaky hoses, put in a fresh plug and battery, gave jets a rinse, and that got it to start and run.

Trouble is, it only runs with no load. Soon as you give it gas to make it go, it dies.

The intake is a thin rubber hose, and I'm wondering if it isn't leaking and allowing too much air in.

 

Ohhh I hate those things so much, anyone asks me to fix one of them now I just say they're not for the road, they're for comedy value only (things such as the "reverse immobiliser" on your example for instance, or the single-use kickstarts that start the engine on a flat battery just fine..... Once, and rip out of the casing in the process)

I'd imagine the intake could well be leaky.

Also, where's the fuel tank, under the floor? the nasty fuel "pumps" can go bad too and not work under load.

 

Underbutt. Tank is in the upper rear of the "toilet bowl" and there is no fuel pump, just gravity feed.

 

I believe that's the "Instant Karma" theft prosecution device.

 

Oh, not seen that before (mind you, as hinted in my first reply I try to avoid these things a bit now :? ). What about petrooster/flow/filter? Tank breather and float bowl breather not blocked?

 

What happened with this, you find the problem?

I've also recently heard of "new" ones of these things having blocked carbs needing cleaned from the factory... The Chinese may have an industrial revolution on the go, but "quality" and "control" are 2 words I don't think they have in those funny squiggles they call writing yet...

Had some great cheap/replica stuff from there at knockdown prices (pazzo style levers for £25, 48 LED brake/tail bulbs £1.50 a pair, CB-1 gasket set £10, Fluke replica multimeter £15 etc etc) and so far all good except one faulty bulb that they sent 2 replacements for free You got to buy carefully as there's a lot of crap but they're getting better for sure (never thought I'd be happy to knowingly buy stuff "Made In China" a year ago!)... When they invent Q.C. they're my tip for being the next big power in manufacturing...

 

"I don't think they have in those funny squiggles they call writing yet"

8O ahem...

Their "funny squiggles" have been around a lot longer than your funny squiggles old boy :lol:

http://www.ancientscripts.com/chinese.html

 

I don't work on those thing either. Won't accept them in my shop. Scooters and those kids 4 wheelers. Junk. Worse than a Kawasaki

 

I think there is a crack in the rubber intake.

I haven't pulled it off yet, I've had some other stuff some up and it's backburnered for a bit.

 

You're taking me out of context there sport, the meaning was more to do with the fact that they don't seem to grasp the concept of checking products as they leave the line (to see if they actually work before shipping), not that the language itself was in any way to blame. 顺便说一句，我可以讲一点点中文。你能吗？

 

They actually know the concept quite well. A brief glance at one of the products of their small arms industry will illustrate that.

China is fully capable of producing quality products. However, were they to do so, those products would cost like other quality products. People aren't willing to pay for that and get the crap they ordered and paid for.

 

I disagree, inasmuch as the cheap "crap" I've received has been overall very impressive for the money. However if I bought the same products again they could well be DOA. That's what I mean by quality control (does the product function before we send it out?)

Some of the stuff is great, other stuff does not work from the get-go. If they applied a basic QC to the items no doubt the cost would go up (maybe 1-2pence per item?) but at least the items would all arrive known-good & their products would rise further in my (and other peoples) estimations

 

Some of us old guys can remember when the same was true of Japan. "Made in Japan" meant junk. By the 80's that had completely reversed.

China will probably do the same one day. But probably never in cheap internet order powersports equipment.

 

That's pretty much exactly where I'm coming from, if they start QC'ing then in a short time most people will be as happy to buy Chinese as they are to buy Jap nowadays or Brit waaaay back when we actually HAD a manufacturing industry to speak of :?

Prices will inevitably rise, but until then shrewd/careful purchasing can yield some fantastic bargains, maybe India or Africa will be the next ones to "pick up the baton" when that happens, maybe the Koreans will blow us all to kingdom come before they get a chance to. Either way, I'm all for Chinese ebay specials like I've bought. Just avoid their scooters like the plague haha :?

 

One of the major tools the Japanese used was continuous improvement: where the workers are empowered to identify and resolve problems. Not sure the Chinese bureaucracy can allow that.

I was involved in training some Chinese Engineers at McDonnell Douglas in the late 80s. They were like cattle, they all did the same thing at exactly the same time. At 5:00 sharp there was a stampede for the exit so they could get on their bus and back to their handlers. If that's how they still do things no one is going to speak up and improve anything.

 

I dunno, there may be some free spirits (or at least free thinkers lol) there, because when some LED bulbs turned up damaged in the post (wrapped in half a turn of bubble wrap for the 5000mile? journey!) the replacements did come in a good deal more bubble wrap

It's an oppressive regime they live under for sure & I don't envy the people at all, but I think that things are changing.... slowly...

 

"At 5:00 sharp there was a stampede for the exit so they could get on their bus and back to their handlers"

Sounds like where I work! :lol: :lol:

Oh and apolgies for thread hijack OP!

 

OK, confirmed an intake manifold crack. Trying to silicone it up now...

 

Also, while I can't find anything worthwhile on the Chongquing Huasong scooter itself, pictures and general technical info are leading me to believe this thing might be a clone of an older Yamaha Vino.

 

Chongquing Huasong.... Got to love the names of these things, don't quite trip of the tongue the same as Yamaha or Suzuki though lol

They're doing a good deal of copying so I'd not be surprised if it is something like. Not sure what a Vino is in Euro language though, maybe an Aerox?

 

I have a friend that was involved in buying scooters from China,when you told them what you wanted you were asked to specify what price range you were looking at.
Thus if you specified $5 quality level that is what they would supply and if you wanted a $20 quality level that was fine too.
Surprise,surprise you get what you pay for.
Seems like such a waste of resources to make crap that wont even operate for a 100 hours though.

 

It does, but as long as there are people willing to buy into $5 quality scooters ( :? ) they'll fill that gap in the market...

JPaganel, sorry for turning the thread into a debate :lol: I forget now if this is 2 or 4 stroke?

Just trying to find details on the Vino to compare it to the Aerox but can't find it :?

 

Vinos came both in 2 and 4. This is a 2.

 

Siliconed up the intake, put it back together, and couldn't get it started.

The petchicken is bad. It leaks fuel out the vacuum side and does not have fuel coming out of the fuel side.

 

Wring it's neck

 

Alrighty, then. Moving on.

Siliconed up the intake. Finally got a new fuel valve. Put it in.

Now, I can start it, but to keep running it needs to have the throttle cracked open a hair. Let go of the handle, and it slows down until complete stop. At part throttle it runs strong.

Wonder if it was adjusted for the air leak, and now that it's no more it doesn't have enough air to run...

 

Found the idle screw, got it set to where it idles and doesn't die.

Actually went a whole block on it. And back.

The thing won't go over 10 Mph. As soon as you crack it open more, it bogs down.

Main jet clogged?

 

Did you feed the chicken?

 

Sacrificed it and got a new one.

 

Possibly, be worth making sure the carb goes to church (at least there's only one of them this time!) and that the float height is in spec (whatever it is :/ )

CV diaphragm not split or piston not rising properly? Umm, fuel definitely getting from tank to carb properly & no air leaks now? About all it could be on the fuel side (unless the main jet was never drilled big enough).

EDIT-: perhaps another run & doing a plug chop after holding it wide open (or to max speed & where it's just starting to bog out) for a few seconds would tell you for sure it's fuelling related

EDIT2-: Also, just for shits & giggles, perhaps you could find specs for oil flow rate as it's pump lubed (probably only worth looking into if it smokes even when warm though as it'd probably show other symptoms if it were this) and maybe even find a way to check the crank seals (if you can access the crank ends you 'd probably see oil/fuel mist around the outer part if they were bad, again not as likely as I'd expect it to be more a tickover issue, but worth checking all the same)

If it's not fuel/mixture related I suppose it could be timing, perhaps not advancing as it should or set up for low octane 3rd world fuel but I'd still make sure the mixture's sorted before suspecting ignition trouble.

Oh, and did you fry up the old petrooster to the Colonel's secret recipe? lol

 

I've had the carb open, there is no gunk there and the one jet I saw was clean. Probably worth checking again.

Float is plastic and not adjustable - molded in one piece.

No diaphragm. This is a round slide carb, slide is pulled by cable directly.

Worth a try.

Specs? Bwahahaha! You Brits and your comedy...

I could look up the Yamaha that I think this is copied from, but whether that's actually in any way relevant is anybody's guess.

Don't really know how the timing works on little two-strokes.

Nope, just wrung it's neck. Did give some thought to shooting it, but my shooting club does not allow junk targets.

 

Figured it out.

I forgot to put a restrictor tube back in when I was reassembling the airbox. It makes the air inlet about the size of a BIC pen.

Running without it lets too much air in (pods, anyone?) and makes it die from too lean a mixture.

Now it runs, still smokes a bit, but actually goes. I went to the gas (petrol for you, bloke) station and back. According to it's speedometer it reached 40 Mph, which I'm thinking is a bit improbable.

I cautiously declare success.

 

Congrats! 40mph is not improbable, especially with a tail wind.

All 2-strokes will smoke a bit as they are always burning oil, but you can make sure your using the right ratio and use a high quality oil and it will all but vanish...until you gun it that is and burn away the crusties. You can also use MMoil or SeaFoam or STP upper cyl lube in place of some of the oil mix and it will smoke less and stay cleaner.

 

I couldn't help you make it a better ride, but I love this thread

 

I don't know that anything can make it a better ride. The objective was more to make it a ride rather than a push...

 

injection or premix ? either way, spend the $ and get 2 stroke oil for a motorcycle not lawn-boy or outboard marine engine oil. it will make a differance.
remember, all things being equal, more oil = less gas = leaner mixture = bad things

 

Injection - there is an oil tank.

I thought it was interesting just how dramatic the effects of too much airflow were.

If this thing were mine, I'd do some serious modding to it, rebuilding some of the electrics, tossing the stupid alarm and blinker beeper, and maybe getting rid of a bunch of plastic, just Mad-Max it with some aluminum sheet and rivets.

 

http://pinterest.com/medcoastcustoms/scooter-mods/

 

This is what it looks like now:

 

air flow?? Seriously this thing MUST breath through a straw. Consider that you could keep the entire combustion chamber in your pocket!

Looks like a frog. Add a lightening bolt and it will go 5mph faster.