Yamaha (RD350 YPVS or also called the RZ350) CDI problem FIX? Yamaha RZ350's (especially 1983 and 1984 models) have a CDI problem that causes it to fail over time. A used unit from a a newer model don't work unless you replace most electrics. I heard of some people fixing this problem by taking the CDI apart and replacing or soldering the fault. It's hard to take the CDI apart but I never seen anyone release the fix or a schematic of the CDI with test procedures. Does anyone have a schematic/circuit details or know how to test, FIX this CDI? All the info I have listed here I found posted in newsgroups, etc but does not include repair info. If you change the stator/CDI/coils from a newer model, it will work BUT it would be nice to know how or why the CDI units are failing and what (transistor/diode/resistor) needs to be resoldered/replaced. PLEASE post any technical info about this problem. I'm interested mainly in the 1983/84 CDI info. New CDI's also have problems but don't have a high failure rate like the 1983/84 models. Someone below also said they fix the problem but never posted the fix and the e-mail from 1997 don't work anymore. --------------------------------------------------------------------- This may sound obvious, but did you check the spark after it cut out. Supposedly there was a design flaw in the cdi box that caused them to fail at a high rate. My bike has a broken box. Have to preheat the box or park under the hot sun for it to start. If you have a bad cdi, it's $$$ to replace. --------------------------------------------------------------------- My second CDI box quit this summer. BUT I fixed it !!! Took a couple of hours to dig through the epoxy and gravel but I have fixed it. I am about to attempt this on another box in a couple of weeks. Do not throw away your CDI boxes just yet. Just in case I have actually figured out how to fix them and it aint just a fluke. ---------------------------------------------------------------------- i assumed that the YPVS and ignition system would be nearly identical. I could not find any spec regarding the CDI unit, in fact the manual stated that Yamaha had not released details at the date of publication? ---------------------------------------------------------------------- tighten a large hose type clamp with a dowel on top mid-point applies pressure to the circuit board in the CDI for it to work again. This is ONLY a temp fix so you can find a replacement or fix your old one. Three CDI types on Yamaha RZ350: 29K-50 for 31K 1983-1984 RZ350 52Y-50 for 57V/1JF 1985-1986 RZ350 1UA-50 for 1WT/1UA/3DH1 1987 on ?
