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07-15-2010, 1:36 PM cxdavid Joined on 05-09-2009 bedford Indiana Posts 30 Left side missing out serious tech head question. Left cyl missing but only part of the time.Started all at once not carb. related. coil swaped everthing eliminated back to black box under seat. Dont quite know what the box does. Can anybody help with testing there back? 1980 cx500D 60k on motor Its a daily driver. Misses occasionaly at idle Misses consistantly on acceleration Misses steady off and on at 2500 RPM Doesnt miss at over 4000RPM 1980 cx500 deluxe    Report

07-15-2010, 2:10 PM Blue fox Joined on 04-18-2008 COLUMBIA, MISSOURI Posts 1,533 Re: Left side missing out You say it is not carb related, but the symptoms in your signature block would indicate that it could be.  The black box under the seat is the CDI module.  It takes the output from the stator and times a electric pluse to the coils to fire the plug.  They can go bad, altho I don't know if just one side output dropping out is common.  The only reliable way to test is to swap with a good unit.  There is a test for the low and high speed windings in the stator, I believe that can be found under the first post in General Discussion section.  Blue Fox 1983 GL650I, 79-CX500C, 1980 CX500C, 82-GL500I, 82-GL1100, 76-CB550, 81-CB750C, 73-CB350F, 71-CT90,    Report

07-17-2010, 9:30 AM dawoluff Joined on 07-17-2010 Posts 1 Re: Left side missing out OH My Friend-- I feel your pain--    80 cx500deluxe Same problem with a slight variation- mine runs out fine until warmed up, then wants to crap out in the 5k range on the tach, no matter what gear. I've done some research on the 'black box' and it is basically an ignition module that runs off a pulse generator on the alternator. Internally, it has a circuit that advances the spark as revs go up. Possibly the box breaks down at certain RPM, but it is difficult to find a new one, so I talked to a friend who has had one forever, and he suggested that before I chase down a new module, that I adjust the tension on the cam chain. -- This could make sense-- GOOD LUCK    Report

07-17-2010, 9:42 AM Shep Joined on 01-30-2007 UK.2x1980CX500A Posts 7,647 Re: Left side missing out Many people automatically assume the CDI ignition box is faulty but before you throw it away even a single bad spark plug/spark plug cap or coil can cause similar problems as can a faulty main fuse holder, Click here, http://globalcxglvtwins.hostingdelivered.com/viewtopic.php?f=8&t=84 And, http://globalcxglvtwins.hostingdelivered.com/viewtopic.php?f=8&t=27 And, http://globalcxglvtwins.hostingdelivered.com/viewtopic.php?f=10&t=335 My Music http://www.reverbnation.com/pauldouglas/ Join Just In Case :) http://globalcxglvtwins.hostingdelivered.com/ Id quot circumiret, circumveniat    Report

07-19-2010, 3:37 PM cxdavid Joined on 05-09-2009 bedford Indiana Posts 30 Re: Left side missing out Ya it sucks! Thanks for your help everybody. Hey dawoluff if you adjust your tention on the cam chain and you have any luck let me know!Thanks again! 1980 cx500 deluxe    Report

Honda CX500 & G... » CX500 GL500 Tra... » Technical Help ... » Re: Left side missing out

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