Post by fufsgfen on Feb 26, 2017 11:47:18 GMT -6
I wish someone could give me little pointers, my moped is not exactly scooter, but before I had a scooter and this one is electrically very similar.
Model in question is Wuxi Nooma NM50, Chinese moped.
Engine is Honda 50cc copy with starter motor on top of the engine, 4 gears and manual wet clutch.
Issue I'm having is what I would guess being weak spark, very poor low end torque and cutting out at part throttle, weak starting when warm, mixture adjusting does not help much.
I get 7 Volts AC to yellow wire that is connected to Rectifier, this wire goes to lights.
From stator/magneto wires (two yellow) yellow one 15V at idle, 60V at max rpm, Yellow 2 gives 9.5V idle and 33V max rpm. Some information I have got claims that both wires should give same voltage. I have swapped wires around and not much change from that.
I'm not sure if it is full wave or half wave setup, but compared to GY6 stator this bike seems to have floating ground where as GY6 had not, but that is one thing I need help to figure out.
I have two rectifiers, testing with another gives exactly same voltages. I have added ground wires and cleaned ground contact points.
![](http://s1.postimg.org/ksm29zhpr/wuxi_nooma_cdi.jpg)
![](http://s1.postimg.org/5l62pmpv3/wuxi_nooma_rectifier.jpg)
Brightness of rear license plate light for example fluctuates a lot, it gets steady with increasing rpm from idle about 100-200rpm, but then it starts fluctuating again.
If I put +12VDC from battery to yellow wire of rectifier, there is lot more low end torque, starting is easier, and it does not cut out at all when driving, feels to have more power, but I'm afraid that might burn up something, I have had such connection about 1 hour, when I took wire off and restored original connection there was again less low end torque no any new issues, but all old issues comes back.
I bought this at October and issues with poor lights were there, seller gave instructions at December to change wiring for the lights so that now headlights is connected to battery, but since then they haven't answered to my mails and are not sending parts that were broken when I got bike (I bought it new), so now I have to find what needs to be done by myself and fix then from my own pocket, which I will try to then get seller to pay.
I get bit of carb icing too, but that is cured by fuel anti freeze additive, also I have set mixture several times, checked leaks etc and all that seems to be ok now. (as new it had broken intake insulator that is between carb and intake manifold).
I guess my CDI is AC unit and it might not like from DC voltage for long, but I don't understand why adding +12VDC makes it run so much better, does it help coil to give better spark is only guess I can make?
What I think is that I would need to get somehow 7VAC to 12VAC, but as headlight is no longer in AC circuit, AC voltage is still same, no improvement.
Seller originally wrote that stator would be broken and he sends new one, but he never did that, instead instructed to change wiring for headlight, that is what I would need to verify, should I get new stator should it give same voltage to both wires?
Seller also claimed originally that headlight is in DC even I did measure it being in AC, he wouldn't believe me, then he sends instructions where he claims headlight being in AC and needs to be moved to DC, seller is nations leading expert on this model, so I guess experts here are not much good?
Sorry about lengthy post, but I guess there are still some things I forgot and you need to ask about.
Model in question is Wuxi Nooma NM50, Chinese moped.
Engine is Honda 50cc copy with starter motor on top of the engine, 4 gears and manual wet clutch.
Issue I'm having is what I would guess being weak spark, very poor low end torque and cutting out at part throttle, weak starting when warm, mixture adjusting does not help much.
I get 7 Volts AC to yellow wire that is connected to Rectifier, this wire goes to lights.
From stator/magneto wires (two yellow) yellow one 15V at idle, 60V at max rpm, Yellow 2 gives 9.5V idle and 33V max rpm. Some information I have got claims that both wires should give same voltage. I have swapped wires around and not much change from that.
I'm not sure if it is full wave or half wave setup, but compared to GY6 stator this bike seems to have floating ground where as GY6 had not, but that is one thing I need help to figure out.
I have two rectifiers, testing with another gives exactly same voltages. I have added ground wires and cleaned ground contact points.
![](http://s1.postimg.org/ksm29zhpr/wuxi_nooma_cdi.jpg)
![](http://s1.postimg.org/5l62pmpv3/wuxi_nooma_rectifier.jpg)
Brightness of rear license plate light for example fluctuates a lot, it gets steady with increasing rpm from idle about 100-200rpm, but then it starts fluctuating again.
If I put +12VDC from battery to yellow wire of rectifier, there is lot more low end torque, starting is easier, and it does not cut out at all when driving, feels to have more power, but I'm afraid that might burn up something, I have had such connection about 1 hour, when I took wire off and restored original connection there was again less low end torque no any new issues, but all old issues comes back.
I bought this at October and issues with poor lights were there, seller gave instructions at December to change wiring for the lights so that now headlights is connected to battery, but since then they haven't answered to my mails and are not sending parts that were broken when I got bike (I bought it new), so now I have to find what needs to be done by myself and fix then from my own pocket, which I will try to then get seller to pay.
I get bit of carb icing too, but that is cured by fuel anti freeze additive, also I have set mixture several times, checked leaks etc and all that seems to be ok now. (as new it had broken intake insulator that is between carb and intake manifold).
I guess my CDI is AC unit and it might not like from DC voltage for long, but I don't understand why adding +12VDC makes it run so much better, does it help coil to give better spark is only guess I can make?
What I think is that I would need to get somehow 7VAC to 12VAC, but as headlight is no longer in AC circuit, AC voltage is still same, no improvement.
Seller originally wrote that stator would be broken and he sends new one, but he never did that, instead instructed to change wiring for headlight, that is what I would need to verify, should I get new stator should it give same voltage to both wires?
Seller also claimed originally that headlight is in DC even I did measure it being in AC, he wouldn't believe me, then he sends instructions where he claims headlight being in AC and needs to be moved to DC, seller is nations leading expert on this model, so I guess experts here are not much good?
Sorry about lengthy post, but I guess there are still some things I forgot and you need to ask about.