Home Page Electronic Ignition Fitting Bing Carbs Importing Charging Circuit Chang Jiang Links
If you have any questions please post them on the forum board below:
Obviously before we start and more to the point, before you start modifying your designed and engineered motor bike, I take no responsibility for any damage or harm caused by you following these instructions. Nor do i take any responsibility for any personal harm to yourself or others if you have followed these instructions and things go wrong!
That said I have had no problems with any of these modifications and would not expect you to have either. REMEMBER: "These machines have no brain, please use your own".
I will not plagiarise the hard efforts for Mr. Pete Roper and you can read his website CLICK HERE this was a fantastic site although not meant for us Chang Jiang riders initially it fits perfectly in to our world. Basically the charging circuit of the CJ750 is of the 1938 design and the voltage regulator is of the mechanical design, this functions perfectly well but is not the best design to ensure accurate charging voltage of 14.5 volts DC. In fact I would worry about having this type of voltage regulator installed if fitting the electronic ignition system as I do not know how sensitive the electronics might be to high voltage discharges. Anyway as always, I was looking for something to "do" on my beloved Chang and the charge light had been staying on longer more recently. In fact the charging system had not been working correctly since I had re-built the bike many months earlier, but as I rarely rode the bike I had not noticed this problem and regularly recharged the battery with a mains battery charger before going out on the bike. The bottom line was that I had brought a brand new voltage regulator and rectifier before leaving China, however the new rectifier had a faulty diode and the regulator did not seem to allow a high enough charge to get through to the battery. I had been reading the BMW handbook and seen how the benefits of an electronic voltage regulator could work for me. so I set out to look for the answer on the internet. The above article by Peter Roper provided that information and I soon headed down to the car breakers yard to purchase a second-hand Bosch RE55 voltage regulator. It was a two pin variety which meant a perfect replacement for the 12 Volt Chang Jiang system. It fitted on to the back plate perfectly and again does not stick out like a sore thumb! The voltage rectifier was repaired by myself, by replacing the faulty diode with one from the previous defunct board. For now it continues to work seamlessly with the electronic regulator and remains in place. However when it finally gives up the ghost then i will replace it with the Ingrams 9692 rectifier as per the article above. Check it out because it offers a chaep alternative to the original parts if you have not got them and have to order from China or you own a BMW and do not want to pay the OE manufacturers price tag of $$$$$$$ for the rectifier and stock regulator.
Happy riding folks!