no spark - no ac voltage to cdi when plugged in  By  crawdaddy (Read 10,947 times)

I have a solution for you, I sell tested cdi's.

John

The orange CDI's are the worst. The longest I had one last was a month, and they often die within a ride or two in freezing temps. They are supposedly simplified and more compact versions, but I feel they cut corners to achieve that and produced trash. Get a gold Casoli CDI, they last forever and have an advancing angle instead of fixed advanced angle like the orange and blue ones have.

Bought it used with 87 in about a month ago and in the last two weeks put in and 5 mph faster!!! Seafoam im leaning towards just to make sure my baby purrs good ?

No seafoam has no effect on performance unless your ride was already suffering. Avoid using additives except seafoam (and even that only in small amounts), these tiny engines weren't built like cars and a lot of common additives are for cars not tiny 50cc engines. 

You should always have been using octane. The reason is different octane levels of gas explode at different points, and using the wrong octane will put your timing off and cause you to run bad or eventually not at all. Putting seafoam into your system after running it with low octane would be a good idea to get rid of anything leftover and liquefy anything you may have gotten clogged. I run seafoam in my tank every fill up or two, just a shot glass for your first few fillups then a half of a glass after will keep it clean and running happy. 

CDI's don't improve performance a lot, but in combination with other mods they do add up and eventually you can get a 50cc up to 45 top speed and 30-40 cruising speed. The difference in the way CDI's work is that a performance CDI will ignite the gas/air int he combustion chamber at a slightly different time than regular and if tuned properly can give you a boost in acceleration and overall make yoru engine run smoothly in comparison to stock. Stock CDI's are great though, nothing wrong witht hem at all, the max you can hope for from a performance CDI is about 3mph top if you're running performance parts. Although the best CDI for performance is the casoli brand, it is much bigger and is gold, and is very hard to find a comfortable space to put it haha, but it lasts forever and puts up with so much you can count on it nomatter what. I've gone through an engine already and the casoli CDI outlasted the engine, now that's something to say about thier quality.

Scrappy sells the casoli CDI I think? Can't find it on his site so here's one from ebay:

www.ebay.com/itm/CDI-Scooter-AC-Casoli-GY6-Chinese-Performance-/390691527435?hash=item5af7079b0b:g:MusAAOxyrxZR3bci&vxp=mtr

You guys knock the orange cdi, that is a work horse. I'm not sure where you get them from. The ones I have are work horses. As far as the Casoli's go they don't all have the same timing curve.

John

Well, I don't know if I am happy or sad. I still have no spark but I took all 3 of my cdi boxes to another scooter and they all spark so the cdi's I have are good.
Only thing left in my mind is that stator or pickup unless someone can think of something I am missing.

50 volts is the lower limit of a workable voltage but it should allow a touch of spark, just not a good one. the pickups are very hard to get a real measurement on. but my meter is digital and i have heard an analog works much better for this. as you have tried the cdi an another scoot, do the same with your coil and plug wire. also, check the ignition kill wire to the cdi, if it is grounded,which will not allow spark. a bad contact in either the handle bar switch or key switch or even a chafe/pinch in the wiring harness could cause this.