From: glenb900 on 10 Sep 2006 12:26 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. --------------------------------------------------------------------- >> jmar...(a)elvis.dr.att.com (John W. Markus) writes... >> > The bike occasionally runs fine, but eventually dies. >> > When he's riding along, the bike will start sputtering. >> > If he keeps the clutch out, it's like the bike is running >> > out of gas. If the clutch is pulled in, the tach goes >> > crazy for a bit, then drops to 0. 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. --------------------------------------------------------------------- > Yes, once it was the black box. Try to borrow one that you know works > and try it. 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 ?
From: The Older Gentleman on 10 Sep 2006 13:55 <glenb900(a)hotmail.com> wrote: > PLEASE post any technical info about this problem. Try again, this time with a comprehensible posting. -- Trophy 1200 750SS CB400F CD250 Z650 GAGARPHOF#30 GHPOTHUF#1 BOTAFOT#60 ANORAK#06 YTC#3 BOF#30 WUSS#5 The bells, the bells.....
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