Sundiro XDZ50QT B Akita By sirthomas (Read 5,543 times)

[sirthomas]

I am retired and as a hobby I rebuild small engines, starting out with 2 cycle Weed Eaters and Blowers and 4 cycle mowers and tillers. I just advanced to Lawn Tractors. Now some neighborhood kids brought over a Sundiro XDZ50QT B Akita Scooter. Someone has torn into it before. It won't start. I know it had been working because I've seen the kids riding around in it.

It will not start with the kick start. The battery on it was dead. I tried a different 12 volt battery I had. Nothing. If I bypass the solenoid, the starter will crank. I'm getting continuity from the wire coming from the start switch. What trips the relay or plunger in the solenoid on these things.

A lot of stuff on this scooter is new to me. I can't seem to locate a Service Manual, Parts Manual or Schematics. I'd appreciate any help. I can't legally drive and I'd like to pick up a scooter to rebuild for myself.

[sirthomas]

Attached are pictures of the scooter. Looks bad doesn't it. I don't know where the kids found it.

[sirthomas]

Big question. Does the CDI have anything to do with the starter switch? How do I test the CDI and where do I find a replacement if I need it.

[jeffco]

I'm new to these as well. But in general, for a no-crank/no-start situation I'd be looking at the ignition switch, engine kill switch, and any safety interlocks it may have (like most full size motorcycles have sidestand engine kill switches, etc)...with motorcycles I'll usually find the problem in that trio of electrical parts, or the wiring between them.

With the ignition on and the engine cranking, there should be a continuous on-off-on pulse in the wiring between the CDI and the coil. Coil should have a continuous 12v supply, plus the switched path to ground that the CDI provides, if it works in a typical way.

I gather these use a magnetic coil type sensor to detect TDC and signal the CDI. If it goes bad the CDI will not produce a coil pulse. You should be able to see the signal from it with a meter set for very low DC volts.

As far as whether the CDI is involved with the starter I don't have any idea, sorry. But I kinda doubt it.

[sirthomas]

All I know is that there is no juice going to the solenoid to engage the plunger which completes the circuit from the battery to the starter. There are tons of wiring on these things and most are covered with tape or black tubing so it's hard to trace the wiring. If I disconnect the connector from the switch to the solenoid and check for continuity, there is continuity but when I set the meter on DC voltage there is constant fluctuation in the reading WITHOUT the starter button being pressed but with it pressed, it reads the voltage going down to zero. It's not making sense to me. I need to figure out where along the circuitry the battery supplies the current needed to activate the plunger.

[sirthomas]

I think I'm making some headway. I found where the ignition switch used to be wired in. It had come undone. Now the fuse is blown so I have to get a replacement to proceed. I ordered a new ignition coil and spark plug to replace the one I damaged. As soon as those come in I might make some progress. Still wish I could find the correct wiring diagram for this scooter.

[JR]

sirthomas


Very few Chinese scooters have a diagram let alone a correct one. But here is how the starting circuit works and it's the same on all sccoters:







Once the key is turned on 12Vdc is sent to the system such as the brakes, horn, turn signals. To start the scooter one has to press either brake handle and by doing so you sent voltage to the brake lights and the starter solenoid rely at the same time. When push the start button you are sending the ground side or negative side to the negative side of the starter relay thus completing the circuit and making the relay engage sending 12Vdc positive from the battery to the starter. The above diagram illustrates the starting circuit. The colors are generally code to most scooters but it could vary. The principal is the same no matter what color the wires are.

Here is a good diagram that will work for a large variety of scooters out there from older models to those of today.

[sirthomas]

This diagram shows two fuse blocks. I've only found one. Is that an exception or should I keep looking. The headlight is not working though the tail, tag and turn lights are.

I haven't been able to get a 7 amp fuse. I see Advance Auto carries 7.5 amp 12 volt glass fuses. That should still work right?

[JR]

sirthomas Most scooters only have one and yes 7.5 will be fine.

JR

[sirthomas]

Anyone recognize this carburetor?

.dropbox.com/sh/f7kpm6y4wohqh3z/AAAyrZ01VNxvZhA5UceQ2WWEa?dl=0" rel="nofollow" target="_blank">.dropbox.com/sh/f7kpm6y4wohqh3z/AAAyrZ01VNxvZhA5UceQ2WWEa?dl=0

[sirthomas]

I'm learning very quickly on the mechanics of this scooter. The oil and gas is mixed but not in the tank. The oil goes into the flywheel side of the motor (I haven't taken the motor apart) where it is pumped through a small line into the carburetor.
Also the gas tank has a check valve type setup. One line runs from the chamber between the carb and the engine block which creates a vacuum opening the valve permitting the fuel to enter the fuel line to the carburetor.
I still haven't been able to get a fuse. I can't drive so I have to rely on other people for transportation. With out that I can't test the electrical system. I got the new ignition coil but the wrong sparkplug so I've got to locate a place that sell the right kind of plugs.