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Post by helinor on Jun 27, 2013 22:39:04 GMT 1
Last fall I discovered that the ignition was a bit unreliable. One day the bike started on the frist kick, the next no inition at all. For so to be ok again the day after.
The problem is obviously elektrical, but I can not find any loose conectors or bad wires.
Any one have a clue where to start???
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Post by helinor on Jun 28, 2013 21:39:36 GMT 1
After hours of thrubleshooting I am still not able to locate the fault. Is there anyone out there in the 350world that know the answer of this: The B/W whire from the ignition switch to the CDI unit, is it supose to be measured voltage there when the ignition is switched on? I'm not sure how to check if the ignition switch is working properly? The engine stop switch is working properly and the whiring from the ignition to the stop switch as well. Anyone?  ? |
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Post by cb250g5 on Jun 28, 2013 21:48:15 GMT 1
What bike?
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Post by helinor on Jun 28, 2013 21:51:32 GMT 1
1983 350lc ypvs 31k europe mod.
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Post by cb250g5 on Jun 28, 2013 21:55:20 GMT 1
The ignition switch (and the kill switch) just earth the B/W wire to kill the ignition. So disconnect it to prove the switch. You'll have to stall the engine to turn it off though.
Do you have a sidestand switch fitted on your model? That can also cause problems.
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Post by helinor on Jun 28, 2013 22:20:10 GMT 1
Thanks for quick respond.
No, there are no switch on the sidestand on this bike.
Is there any of the other whires out from the ignition switch I can measure if the switch or the CDI is working properly.
Sorry for the stupid questions, but I am "new" to the RD world......
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Post by cb250g5 on Jun 28, 2013 22:22:25 GMT 1
Thanks for quick respond. Is there any of the other whires out from the ignition switch I can measure if the switch or the CDI is working properly. No. All the switch does is earth that wire (ignition wise). |
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Post by helinor on Jun 29, 2013 21:56:49 GMT 1
Still strugling with this. How do I do a test of the CDI or the rest of the ignition boxe/system?? What Are the must common reason other RD riders find when there are no ignition? ? I'm running out of idas......... |
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Post by helinor on Jul 1, 2013 19:18:14 GMT 1
Still not able to get this bike on the road.
I have the following question: on the conector oposite the main ignition switch., when testing four wires grounds to the frame(brown,black,red/blue and blue)
This is on the "frame" side of the wire loop.
I do not have the technikal knowledge to understand the wiring diagram from the Haynes book.
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Post by steve h on Jul 1, 2013 20:36:36 GMT 1
It could be an intermittent fault in the ignition coil. I have had the exact same symptoms on a bike many moons ago.
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Post by parrott500 on Jul 1, 2013 21:28:49 GMT 1
I had the same problems with my 31k, i have had 2 cdi`s (29k-50) on my bike and now on to my 3rd been ok for the last 2 years just luck of the draw buying second hand beware of words removed from a running bike as yes it will start but 10 minutes later it breaks. I found my faulty cdi by giving the cdi a bash with a rubber mallet it worked for weeks and failed again gave it another bash and again worked for weeks been told they can have dry joints inside?
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Post by helinor on Aug 14, 2013 19:41:24 GMT 1
Jippi....... After testing all the connections, source coil, pulser coil and ignition coil I was still not able to find any thing wrong. Started to measure the cdi unit, while doing so it all of a sudden started.......... So for now the bike runs fine, but for how long? And where do I start next time. My initial thought was to get a new cdi unit for "backup"? Anyone that can think of something else??? Helinor. |
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Post by flames on Aug 14, 2013 19:56:06 GMT 1
when you say npo ignition,do you mean you have no ignition lights or anything? or do you mean the bike cuts out due to lack of spark?
if you have no ignition lights,it could simply be you need a new ignition switch.
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Post by helinor on Aug 15, 2013 8:00:19 GMT 1
No, the lights have been there . But the lack of spark have been quite frustrating.....
I'm quite sure that either the ignitionswitch or the stopswitch are the thrubblemakers.
Helinor.
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Post by cb250g5 on Aug 15, 2013 8:46:50 GMT 1
Have you tried disconnecting the black & white wire from the CDI yet?
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Post by helinor on Sept 16, 2013 19:49:55 GMT 1
I have a strong believe that the CDI is causing this problem. Today it was no ignition again. I was careful not to touch anything, gave the CDI a fem taps with a tool. All of a sudden there was spark again:-) Does anyone know of any replacement type CDI for the 29k-50? Or where on the globe I would be able to get hold of one? Bike in question 83lc2 ypvs Helinor |
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Post by fatfastroger on Sept 16, 2013 20:11:21 GMT 1
the 29k-50 cdi is well known for being a bit intermittent. I have had similar problems. And giving it a tap to work confirms it. The solder joints on the circuit board are a dry and make poor connections. I now have a complete coil/flywheel/cdi from a later model. You could use a zeeltronic cdi - which is an aftermarket one here. More modern electronics and more reliable. www.zeeltronic.com/page/yamaha.phpNorbo sells them - check out the RD LC Crazy shop |
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Post by rich on Sept 17, 2013 19:03:13 GMT 1
Yes you can fit the later 1UA-50 CDI from an F2. You will need to change the connectors and extend a few wires and transpose the red and green wires in the 3 way connector. It will work though and is much more reliable than the 29K unit.
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Post by steeley on Sept 17, 2013 19:13:07 GMT 1
get a zeel cdi and bin the original unit.these things are way past their sell by date.
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Post by parrott500 on Sept 20, 2013 19:51:27 GMT 1
Hi, Try www.electrexworld.co.uk/ they did replacement digital cdi`s for ypvs i had one but my reg/rec over heated and melted it they dont seem to have any listed now on there site but they have them for rd250 & rd350.
Give them call.
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