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Post by steveau4lo on Jun 11, 2024 6:12:59 GMT 1
Hi, I have an 81 RD350LC that has the original CDI. The problem is as soon as there's a hint of rain the bike loses spark so in order to rectify this I ordered one through eBay (Weiltronics) and fitted it to my bike. Now the bike won't rev past 5K rpm. If I refit the old one it revs cleanly throughout the rev range. I contacted the supplier and they said to use resistor caps and plugs. My bike already has resistor plug caps (5k ohm) so I fitted two new resistor spark plugs today and the problem feels worse. Has anyone had a similar issue with a replacement CDI? I am waiting to hear if the supplier will replace or refund, if they refund what is a good replacement CDI that won't break the bank? Note: ignition coil, pickup coil and source coil all test within specifications and there is no damage to the wiring. Any help would be appreciated.
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murp
Drag-strip hero
![*](//storage.proboards.com/1564063/images/OArpjc3Z26Vu8ExORmaz.png)
Posts: 247
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Post by murp on Jun 11, 2024 6:35:09 GMT 1
The fact that all the components test within specifications don't really mean much.... All mine did as well, but still had problems.... It's all over 40 years old and can't be tested under load .... The only permanent solution is to fit a vape system, which replaces all the ignition and charging system with new modern components
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Post by dusty350 on Jun 11, 2024 6:39:49 GMT 1
Hi Welcome to the forum. General rule of thumb was either resistor caps or plugs, not both together. Personally not heard of the make of CDI you bought. Zeeltronic are a tried and tested fit. Norbo has a shop - look at the top of the page - he sells them. Regards a refund - not fit for purpose if it isn't working as it should. Just double check all connections and loom wiring - any electrical issue could have more than one culprit ! Enjoy the forum Dusty ![:)](//storage.proboards.com/forum/images/smiley/smiley.png)
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Post by steveau4lo on Jun 11, 2024 7:16:58 GMT 1
Cheers for the advice on not running both resistor caps and resistor plugs. Wiring connectors and loom are fine, as I said runs fine with old CDI fitted just not with this new one. So I'm certain this new CDI is no good. I'll check out Norbo and likely order one from him once I get a refund.
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Post by stusco on Jun 11, 2024 11:00:01 GMT 1
If it revs ok in the dry surly it’s something getting wet,maybe a bad connection, stick the original cdi in a polybag and try it in the wet and that will take that out of the equation
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Post by midlifecrisisrd on Jun 11, 2024 15:50:41 GMT 1
You've not got those metal plug caps have you 🤔
Steve
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Post by stusco on Jun 11, 2024 15:53:57 GMT 1
I had one of those on my kh125 when i was a bairn and had to carry a can of wd40 around with me in case it rained
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Post by shaunthe2nd on Jun 11, 2024 20:37:31 GMT 1
I had one of those on my kh125 when i was a bairn and had to carry a can of wd40 around with me in case it rained I take a brolly.
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Post by abar121 on Jun 12, 2024 11:54:30 GMT 1
My RG250, RGV250 and GSX600s all went down a pot in heavy rain.
I seem to remember using a clear sealant / film product which sorted the problem.
Something here doesn't like being wet and maybe shorting out.
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