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
|
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
|
|
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
|
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
|
|
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
|
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
|
|
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
|
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...
|
|
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
|
Post by username on Dec 28, 2015 17:09:45 GMT -5
Geh333 bike looks very similar to the one in your profile!
|
|
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
|
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
|
|
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
|
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
|
|
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
|
Post by username on Nov 15, 2014 7:03:16 GMT -5
hi, first of sorry for the delay been very busy recently no never bought a new CDI never throught of this being a problem, the cutting out when going full throttle has stopped now, seems to have resolved itself... weird. it only started happening after i cleaned the carb and i haven't done anything else since to help it, maybe something was sticking or dislodged in the carb and its now sorted itself out.
anyway after replacing the belt 500km ago i have checked it today after noticing a sort of uneven moving sound in the cvt cover it has got a nice big chunk missing out of it (i will post pictures later), hasn't snapped but about a quarter of the width of the belt is missing in a 2 inch long section of the belt, surely a new belt shouldn't have issues so quickly, the only this i can see is a few rubber marks on the starter motor bendix but this shouldnt cause it.. there has to be something seriously wrong with my CVT for it to be eating belts so quickly
anyway im ordering an impact wrench so i can get the clutch bell off and get the springs changed to 1500 to try and help the acceleration. ill keep you updated
|
|
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
|
Post by username on Nov 6, 2014 12:49:24 GMT -5
The power loss has been occurring since about 2000 miles it's slowly been getting worse can't really pin point it to an exact time but I would say after 2000 it has been more noticeable, I have a problem with checking the valves, due to the very smart Chinese man who designed this bike the bottom right bolt that holds the cover on only has 1inch or so of space between in and the frame, I managed to get it off last time by wedging an Allen-key into a socket set head (only just did it) but this time the bolt is too rounded to get it off so can't check them again. The bottom of the bolt is fine so if I had clear access to it I could get it off but I'm not one for taking the engine out, I have some know how but not enough for that. I know what tight valves feel like as that's why I adjusted them last time, it doesn't feel like the same issue. Update since the new rollers the power is smoother and more consistent throughout there doesn't seem to be a dead spot between 18 - 25 mph ish. It feels like when a car is in too high a gear and the engine gets loud and struggles it's like it's in too high a gear when setting off. I said about the float issue as I 'think' it's only been doing the dying on full throttle since I cleaned the carb
|
|
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
|
Post by username on Nov 6, 2014 11:08:01 GMT -5
checked all lines no leaks all in very good condition, the scoot is only 7 month old (or so). couldn't get the clutch bell nut off so didn't replace the contra or clutch springs, did manage the variator nut so changed the rollers to 3.5g and wow the acceleration is much better, still not quite as good as new but much an improvement and have gained some top end i had once lost, i think the issue with the cutting out could possible be the float in the carb, iv been told after cleaning it with carb cleaner it can be a little sitcky and its ok to use a very small ammount of WD40 on the pin and the float to help it move a bit more smoothly. i read a post of someone describing my problem to a tea and it worked for him, is it safe / recommended to do this?
Thanks
|
|
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
|
Post by username on Nov 4, 2014 8:20:54 GMT -5
Ok definitely a problem now, every time I go to full throttle it dies completely, if I go to full throttle for a second it starts to die but if I let go quickly it's ok again, it's like it cuts the fuel spark or air completely when I go full... Any ideas? I replaced the petcock. It's been happening every so often but has now suddenly started it on every twist
|
|
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
|
Post by username on Nov 3, 2014 8:09:00 GMT -5
i have ordered a full set of 1000 1500 and 2000 contra springs and the same for clutch springs to play with see how that goes, also some 3.5gram rollers (current 6.5) may mix them. not changed anything since the fuel petcock the other day an i seem to have developed another fault, when cruising slowly say 5 - 15 mph if i suddenly go full throttle the engine dies, if i let off the throttle it kicks back in again... new stuff coming tomorrow ill crack her open then and have a look
|
|
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
|
Post by username on Oct 31, 2014 20:16:24 GMT -5
Sorry not got time to open up and take pictures but will as soon as I do, please advise on contra spring size in mean time and I'll get that ordered
Thanks
|
|
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
|
Post by username on Oct 31, 2014 20:15:30 GMT -5
Belt size 729 - 17.7 - 30 wheels 12" belt in correct place on idle apart from I'd say a few mil down on the rear pully, I think the contra spring has gone soft and I'm going to order a 1500rpm while I'm at it, are all contra springs the same are they all 107mm can't find any different sizes
Thanks
|
|
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
|
Post by username on Oct 31, 2014 13:41:17 GMT -5
yes thats what i saw, the hose is nice and straight down to the carb, i had the carb off and cleaned it 500km ago, you cant shut the fuel off at the petcock can you? i had to bend the hose and hold it with a bull clip while i had the carb off, if it can be turned off would make the job a tad easier next time, i did let the hose drain into a glass for a few seconds to make sure it had good flow, seemed very good no issues with it and when putting it back i made sure the hose is nice and straight to the carb no bends or up and downs.
going off the fact the spark plug was a perfect hazelnut color im presuming up jetting wouldn't help / make things worse in terms of mixture being rich?
|
|