need help diagnosing bad cdi or magneto

[Big Red]

Parts

i did look at if i could flip the coil armature if thats what its called over and saw that it was protruding so i didn't try to mount it on that side. my black wire i have mounted on the bolt on the top left of the armature when looking at it. i will try to look at the solder connections and see if they look proper. when i looked at it before i know none of the windings of the coil had come out of the bandaging as i'll call it so i don't think the coil itself is damaged. it seems to be putting out very small readings when cranking it. like maybe a volt and a fraction. it seems odd that before i messed with the magnet i would get shocked from just barely cranking it. keep in mind i didn't move the coil armature at all then. only removed the magnet checked out that the key was in and reinstalled the key and magnet. whether i had the magnet on the right way i don't know. i still don't know. i'm going to buy both of those pieces if i can and replace them and hopefully i won't have this problem anymore.

[i did look at if i could flip the coil armature if thats what its called over and saw that it was protruding so i didn't try to mount it on that side.].....

I have seen the coil windings almost centered so the coil could almost bolt on both ways. From what I understand their are about 10 factory's in China that make these things, and sometimes the parts from one will not fit on the other. I found this out the hard way with the crankshaft woodruff key. Some setups take a wider key. So not ALL parts are the same. Can you say CHINESE QUALITY CONTROL?
Big Red.

 

[happyjourney]

i put the new magneto on and had no change in circumstances. i only get like a volt or under coming out of it. i haven't changed the magnet yet. i was thinking to just buy a whole new kit so i could use the engine off it. i told someone that knows a mechanic and i'm going to see if he can take a look at it. something seems wrong. my chain seems rather loose and so thats the reason that the magneto doesn't turn over in a fluid manner. the chain loosens and tightens as its pulled across the chain tensioners. i am thinking that i may have to modify the spark plug cap so that the spark plug fits up in the housing better but i'm not getting any spark anyways. it looks like i'm the only one who has ever had this problem. i don't even get any response back from the maker of the wolfpack kit to return it for a replacement. i'm thinking i'm going to buy a second normal cdi to see if that one will spark.

 

[Al.Fisherman]

Take a screwdriver and check out the magnetic pull of the magnet. I highly doubt that the magnet is bad. Check the small (unshielded) wire coming from the coil to ground, re solder, as it could be a cold solder joint. Cut the white wire off and trash it. Test with a meter without the CDI hooked up. Blue and Black coil wires. Other then testing the V output, how do you spin the crankshaft? Recommend removing chain, spin crankshaft with the nut holding the magnet on (clockwise) and without a spark plug.

 

[Big Red]

Bad CDI?

Al's right about everything, especially the cold solder joint. Sgt. Howard started a thread just because of that stupid cold solder joint.
And DO NOT try to spin the engine over with the mag nut without removing the spark plug. I've stripped out a couple mag nuts doing this and I'll NEVER do it again. Remove the plug and you can put a drill on it to spin it.
You WILL get spark even with a bad cold solder joint, just not enough. It will LOOK good but it wont be. Here's Sgt. Howards thread.
http://www.motoredbikes.com/showthread.php?t=36233
A good soldering job or a new coil might solve all your problems. I worked on one for a couple weeks before I saw this thread, It solved my problem.
Big Red.
P.S. A bad cold solder joint or ground connection could burn out or weaken a coil. A new coil might be in order anyway.

 

[Big Red]

Coil

Cheapest one I could find with FREE shipping except for BGF, (10cents cheaper,). BGF is fast on shipping but parts are sometimes TOO cheap.
http://www.ebay.com/itm/Magneto-Coi...Parts_Accessories&hash=item3374536cca&vxp=mtr
Big Red.

 

[happyjourney]

i'm going to solder that joint tomorrow and see if that was it. i turn the engine over by pedaling. i'm afraid to turn the nut on the crankshaft because i've almost stripped it now and have crazyglue on it to make sure it stays. i'll say again that i bought a new magneto and installed it and nothing has changed.

 

[Big Red]

Magneto/ Coil.

I've stripped out a couple nuts myself, That why Al and I suggested you remove the plug before turning the engine over with the magneto nut. The compression of the engine puts too much pressure on that cheap little chinese nut.
You say you bought a new magneto for it. People sometimes seem to get magneto and coil confused. So did you buy a magneto?
http://www.ebay.com/itm/motor-motor...253?pt=LH_DefaultDomain_0&hash=item20b4ec6b0d
Or a coil?
http://www.ebay.com/itm/66cc-80cc-M...Cycling_Parts_Accessories&hash=item2c6284603f.
The magneto rarely goes bad, The coils go bad all the time. Even a brand new coil can be bad and soldering a better ground on it couldn't hurt. But a magneto is just a magnet and unless it loses it's magnitism then it's probably OK.
I think you had it right when you wanted to go back to the original configuration with the stock CDI, A new CDI is cheap enough to try. If you put something new on it and now it don't run, go back a step to what it was when it was running.
Big Red.
http://www.ebay.com/itm/CDI-Ignitio...981?pt=LH_DefaultDomain_0&hash=item4161b7972d
This one has FREE shipping.

 

[happyjourney]

sorry about the mix up in terminology big red. when i said magneto i meant coil instead of the magnet. i bought a magnet as well but i haven't installed that. i really don't think a change of magnets will make any difference but i might try it. i was going to solder that joint today but i forgot the solder. maybe i can tomorrow. i'm still going to have a mechanic look at it. but i already ordered a stock cdi and i'm waiting for that to get here. i have yet to open up the carburetor and see if its got gas coming through. but i was going to work on the getting spark problem first. i have yet to work on the spark plug cap to make it fit in better as well. i'm feeling pretty sure its something to do with that joint on the coil though as that looks like an issue. thank you everyone for your help and ideas. i'll have updates.

 

[Mitch135]

I've got the same problem if you know how to use a multimeter I'll put a link to a page describing what the resistance should be across the magneto wires and the CDI. mine both tested bad so I just ordered new ones from an ebay store called luckyearlybird cost about $24 all together and bought a speed carb for another $12.

Hope this info helps someone else
https://docs.google.com/document/d/1...iQBgsyFjc/edit

 

[Al.Fisherman]

I've got the same problem if you know how to use a multimeter I'll put a link to a page describing what the resistance should be across the magneto wires and the CDI. mine both tested bad so I just ordered new ones from an ebay store called luckyearlybird cost about $24 all together and bought a speed carb for another $12.

Hope this info helps someone else
https://docs.google.com/document/d/1...iQBgsyFjc/edit

Testing the coil and CDI

How to use a multimeter.