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Jonway Madness YY50QT-31 2014 (now made of more replacement parts than original)
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Post by username on Dec 28, 2015 16:07:01 GMT -5
Hi all
bike: jonway madness yy50qt-31
all servicing done including oil change both engine and gearbox, air filter replaced, valves checked and sorted as it was hard starting. All the usual done. 3 days before they stole it.
stolen and dumped after being ragged around on a very muddy field recovered what was left of it.
completely tore down the bike as there was mud and grit in everything had to replace the steering bearings top and bottom cleaned front and back brakes out replaced all the indicators that where snapped off and all the lights and lenses that where smashed. Reg plate is in the post on its way as they nicked that also.
anyway to cut a long story short the beauty is almost back on the road apart from I haven't been able to get it started since I found it. The battery was flat but then again it usually is and they ripped the ignition out and the 4 wires out of the connector plug. I have read up that having all 4 wires not connected means I should be able to get it started by the kick start but will have no accessory power and to kill the engine would have to put the green wire to the frame to ground the engine. Or cover the exhaust. Or connecting the red and black wire together has the same result.
i haven't been able to get it started. Now they stole all the nuts and bolts and screws etc but then zip tied all the fairings back together (how courteous of them) and I left it with no petrol in or very little and they left it with a full tank (again how nice) although no filler cap meaning I had to discard the fuel before transporting. I have removed and cleaned the fuel tank, the petcock valve the fuel lines and the fuel filter, cleaned the carb and the intake manifold. I have checked the cvt although this was fine clean and hadn't been touched. I have removed the spark plug and grounded it to the cram and when I kick it there is a spark so I have got the electrics right to start it. There is fuel getting into the engine but it just doesn't seem to fire up, there is fuel air and a spark. Can't figure out why it won't fire... I checked the fuse at the battery and it is fine although the spare is now melted clearly they blew a fuse doing something wrong the one connected now is fine.
Any ideas?
Thanks
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Post by dollartwentyfive on Dec 28, 2015 16:28:37 GMT -5
the first thing i would do is completely drain the gas tank and carb.
then squirt a little gas into the carb inlet while trying to start the bike.
about the 4 ignition switch wires:
black
red
green
a striped wire, probably green/ red
the striped wire is the one to kill the engine, ground it to the green wire to kill.
the black gets connected to the red to run the accessories.
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Post by geh3333 on Dec 28, 2015 16:30:43 GMT -5
Wow, they ran it into the ground !! I'm sure it died on them and they left it where it died. Soooooo, where to begin ? Hmmm , you need to buy a new ignition and get a diagram to reconnect it. This way you 100% sure its right. After that it may actually start.
Is it turning over at all ?
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Freshman Rider
Currently Offline
Jonway Madness YY50QT-31 2014 (now made of more replacement parts than original)
Posts: 62
Likes: 3
Joined: Oct 30, 2014 15:22:20 GMT -5
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Post by username on Dec 28, 2015 17:08:06 GMT -5
Thanks for the reply as I said I removed fuel tank limes filter carb intake etc cleaned checked and reinstalled everything front the fuel tank down to the engine is clean clear and working. As for the stripped wire all 4 are stripped slightly, you usually have 4 wires going into a 4 pin plug that then connects to the 4 pin plug from the ignition barrel, what I'm saying is the ignition and its wires and 4 pin plug are gone and the 4 pin plug that connects to the harness side has been ripped off so there's 4 wires each with a little copper wire exposed.
im confident I know the wiring on it and I have ordered a new full lock set just got to wait a few days for it to arrive, until then the fact the spark plug is sparking tells me I have the wiring ok to be able to run it. It's just not firing. Looking at the odometer it look like they only rode it about 8km
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Freshman Rider
Currently Offline
Jonway Madness YY50QT-31 2014 (now made of more replacement parts than original)
Posts: 62
Likes: 3
Joined: Oct 30, 2014 15:22:20 GMT -5
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Post by username on Dec 28, 2015 17:09:45 GMT -5
Geh333 bike looks very similar to the one in your profile!
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Post by geh3333 on Dec 28, 2015 18:01:40 GMT -5
So your engine is turning over and you have spark , that's a good start ! The main thing now is making sure you have fuel and air making it into the chamber. One thing that was mention was spraying fuel into the manifold to see if the scoot starts. If it starts that means its not getting fuel . and that issue is in the carb or possibly the petcock. I always remove the junk vacuum operated fuel petcock and install a manual shutoff valve instead. You can also open the drain on the carb bowl and see if any fuel runs out . if not then u know the carb is not getting any fuel .
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Post by geh3333 on Dec 28, 2015 18:02:33 GMT -5
Geh333 bike looks very similar to the one in your profile! Mime is also a jonway . |
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Post by tvnacman on Dec 28, 2015 19:45:36 GMT -5
recheck your valves, maybe it stalled on them because of the valves. I'm with geh3333 on injecting some fuel. If you can check compression. Have you opened the air box? black to red is for power green to black/white is kill to ignition. John |
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Jonway Madness YY50QT-31 2014 (now made of more replacement parts than original)
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Post by username on Dec 29, 2015 7:47:08 GMT -5
Thanks for the suggestions. when you say squirt a little fuel in the inlet, does the engine need to be in any particular position ie. tdc? and is it just pour a few drops in or get a spray bottle and spray a few pumps in. once i have sprayed some in do i reconnect the carb or can it be left off just while testing if it will turn over? or is it easier to leave the carb connected pull the throttle to open it up and spray some through the carb into the inlet? im sure fuel is getting in as after a few kicks you can smell the fumes coming out of the exhaust a little. as for fuel getting to the carb yep it is opened up and fuel in the bowl. this is fresh as i opened up the carb and cleaned it when i got it back. does the cut out i.e the side stand stop the spark plug firing or does it do something different as the noise it makes is the same as trying to start it with the side stand down. no the side stand isnt down before you ask  im waiting for the ignition and some spade terminals and a 4 block connector to come so i can repair the ignition, i should then be able to use the electric start to see if i can get it going. as for the valves i can check them again but as i said it was hard starting so as part of the maintenence i did 3 days before it went i did the valves and it worked perfectly for the following days. i have heard you can use a socket set connected to a drill on the variator nut to turn the engine over? might be worth trying this? might turn it a bit quicker than i can with my foot if it is hard starting... |
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Freshman Rider
Currently Offline
Jonway Madness YY50QT-31 2014 (now made of more replacement parts than original)
Posts: 62
Likes: 3
Joined: Oct 30, 2014 15:22:20 GMT -5
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Post by username on Dec 29, 2015 7:58:01 GMT -5
ohh and just read your last post, air box is a gonner luckly you can see they removed it after they ragged it around as where it was was the only clean part. this shouldnt make a difference i assume as i have had it started for a few seconds before without the air box connected.
also how do i check compression, i have heard i need to order a part and screw it into the spark plug hole is that right?
Thanks
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Post by tvnacman on Dec 29, 2015 9:34:32 GMT -5
for a quick compression check , take out the spark plug put your finger over the hole and crank the engine over. You should not be able to hold your finger over the hole. If you can then compression is to low, hold the throttle wide opened while checking.
injecting some fuel, I like to pull a vac line and squirt some fuel in the vac line. I use a syringe/flavor injector 1/2 ounce. Put the line back on and crank. TDC BDC not a factor.
As for waiting for the switch parts, put the red and black wires together, if the electrics don't come alive check the fuse by the battery.
I have heard of the the drill method I think it should work.
Now that the air box is off, I bet its too lean to start cover the inlet of the carb when cranking. Has the temperature dropped since it was stolen.?
John
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Freshman Rider
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Jonway Madness YY50QT-31 2014 (now made of more replacement parts than original)
Posts: 62
Likes: 3
Joined: Oct 30, 2014 15:22:20 GMT -5
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Post by username on Dec 29, 2015 11:00:38 GMT -5
ill try that when im home,
the electrics, i had the red and black connected and usually with the key in the on position but the bike not started i could use the indicators, i tried them and they didnt work.
the battery was measuring about 12.6V i tested both sides of the fuse and it said there was only about 3V over it so is it grounding out somewhere and losing power? or is it just the battery is so flat? i have it on a trickle charge at home will test this also when home
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Post by dollartwentyfive on Dec 29, 2015 12:09:48 GMT -5
ill try that when im home, the electrics, i had the red and black connected and usually with the key in the on position but the bike not started i could use the indicators, i tried them and they didnt work. a couple of reasons. wires not making connection inside a connector, or the wires have been cut. the red wire should show 12 volts at the switch (or at the place the switch should be) the black wire has 12 volts when the key is in the on position. the fuse shouldn't have a 3 volt drop across it. also, make sure that the striped wire that goes to the ignition switch is open (not connected to anything) when trying to start the bike. caveat: you can substitute a double pole double throw switch for the ignition switch wire it up as follows: open/ black striped/ red green/ open flip up to start/ run, flip down to shut off the bike. |
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Freshman Rider
Currently Offline
Jonway Madness YY50QT-31 2014 (now made of more replacement parts than original)
Posts: 62
Likes: 3
Joined: Oct 30, 2014 15:22:20 GMT -5
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Post by username on Dec 31, 2015 6:22:46 GMT -5
hey you was right with putting fuel directly in, it did fire up for about 10 seconds. it turns out it is the fuel valve, i did wonder why there was a small spring in the fuel tank when i cleaned it out, i figured it was from the fuel cap.
unfortunately despite hours looking i could not find a manual one to order and have had to order another automatic pressure based one. if anyone knows where to get one from please let me know as im sure the new one will fail again in the next year or two it is the type where the threads are on the fuel tank and the valve has its own nut that it screws up onto the tank with, it is an 18mm nut
thanks for all the suggestions.
igniton did arrive and all wired up correctly, electrics appear to be working i.e. when i turn it to the on position the fuel gauge rises, although the indicators wont work and the rear break light both wouldnt come on. i think it is the battery as i asume both these run from the battery and work without the engine running therefore dont run from the AC stator as when i move the fuel sensor as i currently have it out of the tank the needle struggles to move at all and my alarm system gives of a small beep when its getting a very low current. i will charge the battery fully tomorrow and test if the lights work or not if not i may need some help with that.
on another note something that would of been very usefull while i have been working on it would have been a wiring diagram, anyone have one for the yy50qt-31. this is a UK only bike as far as i am aware but is a clone of many other bikes (as most chinese bikes are) with the same engine and styling i know of about 6 brands of this scooter that are exactly the same just with different make / models written on the pannels. for example the tanco bt49qt-12 is the same
Thanks
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Post by tvnacman on Dec 31, 2015 7:02:49 GMT -5
ok your making some head way.
John
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