Bad Magneto? help!

[rockvoice]

Hey All, I helped a friend build his bike yesterday and it started ran good then we stoped took abreak and tried to start it again and it would not start.

getting no spark (pulled plug turn motor and no spark on cooling fins). So got new plug, new plug wire, still no spark. now took CDI off my bike put it on his still nothing. is all thats left a bad magneto? Thanks in advance for any input. Rob...........

 

[srdavo]

maybe the sparkplug boot?

double check your wiring & try it with the kill switch disconnected.

 

[srdavo]

also....you can check the Similar Threads, at the bottom of this page.

 

[impression]

http://www.motoredbikes.com/showthread.php?t=15491
take a look here.

remember not to flood the carby too.

 

[Revorunner]

Sounds like a bad kill switch to me.Let us know what problem was when you find it.Curiosity Killed the cat.

 

[rockvoice]

fixed it thanks

Hey , I finally used my head and stoped guessing. I pulled the magneto off my bike put on his fired right up! brand new motor bummer. so thanks for all your input. rob.........

 

[Mountainman]

hi Rob
yes that is a true bummer when it comes so fast on a brand new engine
who ever your friend bought it from -- should send him a new magneto (((fast)))

sure do like it better when it starts so as to ride that thing

 

[duivendyk]

Strictly speaking the coil that failed is not a magneto it is the power generator for the CDI unit.If you have a multimeter you can check the resistance to ground on the blue wire,should be about 330 Ohm and around 3 Ohms on the white wire.It is possible of course that there is a short between windings somewhere ,this would not necessarily show up in the resistance measurements.

 

[Revorunner]

Hey All, I helped a friend build his bike yesterday and it started ran good then we stoped took abreak and tried to start it again and it would not start.

getting no spark (pulled plug turn motor and no spark on cooling fins). So got new plug, new plug wire, still no spark. is all thats left a bad magneto? Thanks in advance for any input. Rob...........

I'm confused here.

In this post you said that you,and I quote{now took CDI off my bike put it on his still nothing.}

So you took it off the first time and put it on your friends bike and it did not work.Correct?

Then you took the CDI and put it back on your friends bike a second time and it worked.

Interesting!

 

[arceeguy]

Strictly speaking the coil that failed is not a magneto it is the power generator for the CDI unit......

"Stator" would be the technically correct term, I suppose, but magneto seems to be an accepted and widely used description.

I've run into a "no start" condition where the gap between the stator and rotor (magnet) was too large and it would not trigger the CDI. I loosened the mounting screws, shimmed the gap with a thin material (maybe .030") and the engine fired on the first pop of the clutch.