Taotao 50cc scoot this time. needs more than a thumb

[katoranger]

Well I have another 50cc to fix. This one came with a leaking carb and no spark.

The red/black wire from the stator to the CDI had been pinched in the frame. Repaired that and then stick no spark. I suspected the CDI, but din't have a spare so I tried another coil. Got spark.

Yesterday no carb, CDI, and coil arrive. Put it all together take it for a ride. Rode about 1/4 mile and it died. Restarted by difficult. Then no spark at all again.

Tried swapping coils, cdi, still nothing.

Tested stator 81VAC at CDI. Nothing at coil.

Tested trigger/pickup coil. 0.1VAC This is my suspect. Reading says I need at least 0.5VAC to trigger the CDI.

So now it looks like I need to replace the trigger coil and stator.

Found some good help over here.

http://chinesescoots.forumwise.com/chinesescoots-thread9545.html

[FastDoc]

I'm no expert here but as I recall symptoms like this can be caused by an excessive gap from the rotor to the trigger coil. Maybe that or some debris is causing the problem?

[Weldangrind]

That's what I'm thinking. That, or excessive corrosion inside the flywheel.

[katoranger]

I am not sure what the problem wa, but yesterday I checked the connectiosn again and it is started up and worked flawlessly.

If it comes back I will open up the flywheel cover and see what is going on.

[katoranger]

It quit again.

[Weldangrind]

Yeah, it's rare for those automatic repairs to last.

When I found corrosion inside of a flywheel, I sanded it off and then rubbed in some WD-40 to help protect it.

[katoranger]

I think that is what I will try next. I believe I have the correct flywheel puller.

This may be a good excuse to buy one of those electric impacts.

I told him that I didn't think it would last. New stator assembly is $25.

[SpudRider]

I think that is what I will try next. I believe I have the correct flywheel puller.

This may be a good excuse to buy one of those electric impacts.

I told him that I didn't think it would last. New stator assembly is $25.
I think $25 is a great price for a new stator. ;) Does this price include the pickup coil? How old is the scooter?

P.S. I could use an inexpensive, electric impact driver. Which model are you thinking about purchasing, and how much does it cost?

Spud :)

[Reveeen]

Scrappydog sells just the pick-up ($12), or stator. I bought a stator there, it came fast, and appeared to be the same as original. Watch the pictures carefully!

[katoranger]

I only need the pickup. The stator is working fine.

Spud, the scooter is pretty new. I think he bought it over the winter. About 700kms.

Haven't decided on an impact yet. Harbor freight has some. It would be easier than dragging my little compressor out and getting it setup to remove one nut.

[Reveeen]

I am told those 12V roadside emergency type impact guns will do the trick, probably not much good for anything else, but you know?

[katoranger]

I got it back today. Only 0.2VAC from the trigger coil. Fortunately another coworker had ordered one and didn't need it. I will pick that up today and hopefully have this scoot going tomorrow.

Maybe I will take pics. Have a kodak that needs some testing.

[katoranger]

New scrappydog trigger coil and still no spark. I only get 0.2vac on the trigger coil.

Flywheel is nice and clean.

[FastDoc]

Damaged or broken wire? Perhaps something is getting pinched by the case? Low battery voltage? Corroded connection somewhere?

I don't really know, just thinking...

[katoranger]

Everything is clean. The battery spins it easily. I am wondering if it is a stator problem.

I don't see any pinched wires. Can't locate my flywheel puller either.

[FastDoc]

Are stators cheap?

[SpudRider]

Everything is clean. The battery spins it easily. I am wondering if it is a stator problem.

I don't see any pinched wires. Can't locate my flywheel puller either.
I'm betting the stator is the problem, Allen. ;)

Spud :)

[katoranger]

Stator are $25. I need to find my puller so that I can confirm which one it has.

The stator charges and puts out volts to the CDI, but it my have a dead spot for the pickup coil. I don't know, but I am acumulating parts. :roll:

[FastDoc]

At least you are accumilating inexpensive parts. :wink:

These electrical gremlins can be tough to chase down. :evil:

Serial parts replacement is not the 'cleanest' way to make a diagnosis, but sometimes that's what it comes down to.

Nurse, can you pass me the new spleen? Something's wrong in the abdomen and I need to see if this fixes it... :lol:

[katoranger]

Cheap parts is a good thing.

I wouldn't want to do this with a honda.

[katoranger]

I swapped another coil again. Got spark. 8O

This time I unthreaded the HT lead and put it on the known good coil. Road again for awhile. Start and stop a few times. Seems good.

Read the voltage on the pickup. 0.4-5vac. Seems like I get more volts with it running.

[SpudRider]

...Nurse, can you pass me the new spleen? Something's wrong in the abdomen and I need to see if this fixes it... :lol:
"Parts is parts." ;)

Spud :lol:

[katoranger]

Quit again. Haven't checked for coil output yet.

[SpudRider]

Quit again. Haven't checked for coil output yet.
It's a lot easier when the "thumb repair" works, Allen. ;) Good luck; we're rooting for you! :)

Spud :)

[katoranger]

Okay. I put my test sparkplug in and still had spark. Pulled the plug from the scooter and it was wet looking. Weak spark. NGK plug.

Went and dug in my parts bin and found another plug. Checked with used plug and had good looking spark. Installed that plug and it runs again.

Also I put new carb on, but I think that the vacuum petcock doe not work.

It was leaking gas out of the carb again.

[FastDoc]

Defective plugs do occur. I think sometimes they get dropped in installation or shipping or storage and the insulator gets damaged.

In aviation there is an expression:

'Drop a plug once, drop it twice. The second drop is in the garbage.'

At $20+/plug that would hurt! :cry:

Glad the scoot is good. With that said I'd ride it close to home for 20 miles or so just to be sure...

[katoranger]

I picked up two new plugs last night going to put one in today and then ride it. Yesterday I got about halfway to the farmer's market. Fortunately it was downhill back to the house.

[KentuckyDonkey]

Check very carefully to see if there is a wire or connector grounding out the coil (or one of the other components) intermittantly.

I was having a similar problem once with an old tractor, turned out that a wire was grounding out where it went to the distributor [I know...] only discovered that by accident- by accidentally moving that wire while I was testing......

Usually these intermittent probs are something small and simple like that...and they are the hardest to diagnose!

[katoranger]

Thanks. I checked all the wiring over on it. I has been running great on the second used coil that I salvaged from the flood lifan.


This is a taotao too.

[SpudRider]

So the new spark plug fixed the problem?

Spud :)

[KentuckyDonkey]

Glad to hear that the problem seems to be fixed.....but don't get too comfortable, just yet.... :D But I'll keep my [kill-switch sliding] fingers crossed for ya!

[katoranger]

Still running. They said it hasn't missed a beat.

[KentuckyDonkey]

Still running. They said it hasn't missed a beat.

...then I'd say it is el fixed-O! You may exhale!

[SpudRider]

Still running. They said it hasn't missed a beat.
That's good news! Thanks for update, Allen. :)

Spud :)