Jonway YY250t - 2 years later, still not running... By johnny3d (Read 13,552 times)

[johnny3d]

Well... I'm back at it again (trying to fix my scoot)...

I got in touch with a guy in town who used to sell scooters and has some leftover parts. So I'm going to swing by his place today and pick up a replacement CDI and Ignition coil. I'll install those later on and see if I can get a spark.

In the meanwhile I'm still a little unsure about this yellow wire connection:



So there is the connection. Originally it wasn't connected. It looked a little misshapen and damaged but looks like it should fit.



Here you can see where the other end of the silvery side of that connection goes back and connects up to the auto choke... (I really don't like auto-chokes).



The other end (copper) goes down and connects up to this connection with all yellow wires.



Finally the yellow wire runs back into that thing... which looks like some kind of heat sink to me. But I don't know what that thing is or what it does.

My question on this particular post is: Is that the proper wire to run to the auto-choke? Was it supposed to be connected and just never was? Should I try to fix the connector or just wire it directly to the other yellow wire to avoid any issues with a crappy/misshapen connection?

[alleyoop]

Connect that wire that feeds the ENRICHER so after it starts it cuts off the EXTRA fuel OTHERWISE that may be why your spark plug is sooty to MUCH FUEL.
Alleyoop

[johnny3d]

I fixed/connected and wrapped it up in electrical tape to help make sure it doesn't come apart again.

The guy who has the CDI and ignition coil probably won't be available for me to pick them up from him until tomorrow. He said he also has uni-filters and carb jets should I end up needing those. Of course if I put a uni-filter on it, I'd probably need to do one of those oil return/vacuum tube setups I've read about too.

My main priority right now is just getting it to fire up. So... perhaps tomorrow.

[ellpee]

Deleted -- was responding to an older, already-addressed post. Not enough morning coffee.

[johnny3d]

Well... I managed to get my hands on a new ignition coil. I swapped it out and am still not getting a spark. I checked both ignition coils with a multi-meter and they tested out exactly the same. So I think I've eliminated that from the suspects list.

Unfortunately, the CDI that the guy had wasn't the right one. So I can't check that by swapping it out today.

I also pulled the new spark plug that I bought and put in the old spark plug to try that one. It didn't work either. So I don't think it's the spark plug itself that is the problem. There is a distinct odor of gasoline on the plug when I pull it, so I think it is getting gas, but just not sparking/firing...

Nobody local sells a CDI for my scooter (that I can find)... here's what it looks like:



Note how it has the more square connectors rather than the more round ones I see on a lot of CDIs.

Can anyone recommend a good quality CDI to order online for my scooter? (Jonway YY250T with the 244cc motor) or does anyone have a known good one they want to sell me?

[alleyoop]

.ebay.com/itm/OEM-CDI-ROKETA-JONWAY-ZNEN-LANCE-SUNL-JCL-BMS-NST-APOLLO-250CC-TOURING-SCOOTER-/251381782095?pt=Motors_ATV_Parts_Accessories&hash=item3a8785964f&vxp=mtr" rel="nofollow" target="_blank">.ebay.com/itm/OEM-CDI-ROKETA-JONWAY-ZNEN-LANCE-SUNL-JCL-BMS-NST-APOLLO-250CC-TOURING-SCOOTER-/251381782095?pt=Motors_ATV_Parts_Accessories&hash=item3a8785964f&vxp=mtr

I believe your CDI is A DC CDI, Turn the key on and test the BOTTOM WIRE on the TWO PLUG it should read 12 Volts with the key on.
Alleyoop

[johnny3d]

I tested for 12v DC at the CDI connection and it is definitely getting there. I also did another spark test (grounding the spark plug on one of the head bolts to see if I could get any spark at all... nope... no spark.

So I guess I'll just have to order the CDI and replace that to see if that is the issue.

Looks like I'm going to go with this DC CDI. I would have bought the one you suggested off Ebay but I haven't used my paypal account since it was hacked a few years ago. I can buy the one I linked to with a card though.

[ellpee]

Hey, the first picture you posted, of the "heat sink," is actually your regulator/rectifier, which among other things converts AC from the stator to DC that charges the battery (and runs the electricals when you're on the road). If the picture you posted later showing the back side is of that same gizmo, you're talking about the R/R, not the CDI. I'm not 100% sure, but I don't THINK the CDI has that many wires going into it.

[johnny3d]

Thanks for the info about what the Regulator/Rectifier is. I just wasn't sure what that was. Good to know. The pic later is not of the back side of the R/R... it's the CDI. The new one is supposed to arrive this week and I'm eager to see if it fixes my no-spark issue.

[ellpee]

Looked at a wiring diagram, and it appears the CDI, at least on my scooter, does indeed have five wires going in and out.

[johnny3d]

Yeah. It's a 5 wire setup. There are 6 connections on the CDI but on the 4 connector there are only 3 wires going into it. Shipping is telling me Thursday for the part to get here. I really hope that's the issue and it fires up.

[alleyoop]

Yes that is fine you have 5 wires going to the CDI 2 on the 2 plug and 3 on the 4 plug. On the 4 plug the two bottom ones are for GROUND some have two grounds and most have only 1 ground wire going to it so your fine.
Alleyoop

[johnny3d]

One more quick question before the new CDI arrives (today).

The ignition coil has a "green" and a "black" lead on the ignition coil itself. When the scooter arrived from the factory it was hooked up with the green wire hooked to the black lead and the black wire hooked to the green lead. Should I switch these up and have Green to green and black to black?

[johnny3d]

Well... I plugged the CDI in, plugged in the original ignition coil, put a new spark plug in it and held it up against a known good ground on the head and turned it over... no spark.

Plugged in a different (old) spark plug into the same ignition coil... no spark.

Swapped the wires leading into the ignition coil... and tried again... no spark.

Swapped out the ignition coil and put in new spark plug... no spark.

Swapped out new spark plug for old spark plug... no spark.

Used a multimeter to check ignition coil to CDI wires... both read as good. Ground from battery to frame is good. Checked all the different connections in all the connectors to make sure they were getting a connection and they tested as good.

Put the spark plug in the engine and attached the original ignition coil. Put the air intake system back on... won't start.

Set the multimeter to AC volts, grounded to the battery and the positive to each of the connections to the ignition coil in turn, both registered a small amount of volts while the engine was turning over (my multimeter is analog/cheap and isn't very specific at that low of voltage).

Tried turning the engine over a few more times... no start.

Stood back and breathed through another enormous wave of angry disappointment...

So... yeah.

So two different CDI's... Two different spark plugs... Two different ignition coils... connections tested.

Nobody in my area will even work on it... I've checked at all the shops. Last fall one shop said they would... this year they say they won't. I've lost all confidence that I can fix it...

[alleyoop]

You said you have a ground from the battery to the frame, do you have a ground wire from one of the Valve cover bolts to the frame? Ok if ground is good, Take the BLACK/WHITE wire on top of the 2 PLUG out, that is the killwire from your killswitch, it may be grounding out the CDI.
Alleyoop