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Yeah. I hate it too. A lot.

I've got a spare CDI that is specifically for my scoot now. So... I can eliminate that as the problem. I'm ordering the new ignition coil tomorrow and when that gets here I'll either eliminate that from the list too or it'll fire up. If it isn't that, then I'll plan on replacing the Stator and pickup coil...

If I end up replacing all that stuff and it still doesn't want to fire up... well... I'll junk it and eventually buy a Honda Shadow or something like that. I live 20 minutes from the biggest motorcycle rally in the world (Sturgis Motorcycle Rally). There are always good deals on motorcycles around here. Though with hope I just get this thing running again.

I now have a ground wire to one of the bolts on the valve cover. Tested the spark plug against that very bolt... no spark.

The extra ignition coil I got from a 50cc... So I suppose it's possible that my original ignition coil (250cc) is bad and the 50cc ignition coil I got my hands on isn't strong enough to make any spark at all.

Both test exactly the same on the multimeter though.

I also tried bypassing the kill switch (Black and White on the two-prong connection to the CDI). I just ran a wire from the 12v DC (black) wire to the connection on the CDI to bypass. I got the same result. Started turns over, no spark.

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...

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.

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.

I did a search through the forum (and the web) to see if I could find information about using a Uni-Filter on my 244cc (CN250) engine. I found various vague suggestions to increase the jet size in the carb and to expand the exhaust but nothing specific to my engine or my carb. So... here are my questions:

1. My carb has one tube that leads back to the air intake setup that I think is a breather hose. If I install a Uni-Filter, what is the best thing to do with that breather hose?

2. When my scooter was last running (it is currently not running), it was running very rich. Will I still need to re-jet the carb (bigger jets) or will putting a Uni-Filter on it likely lean it out enough to take care of the rich condition without having to re-jet?

3. The Uni-Filter site suggests oiling all their filters. Should I specifically use the Uni brand spray oil or will other kinds of oil work just as well?

4. Do I absolutely have to modify the exhaust system (such as remove the restrictor plate or otherwise modify the exhaust) if I install a Uni-Filter?

5. Should I really just stick with the original airbox/intake?

Thanks for your time in advance and I look forward to hearing your advice.

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?