1981 cb750 charging problems

Dimensions 68mm Length, 94mm Width, 26mm Height, Hole Distance 80.0mm Center to Center. You are using an out of date browser. thank you, Rotor can fail when hot. Replaces OEM # 31110-300-154. CB750 New member. This unit will not mount where the old rectifier was, you must find a place to secure it after removing the stock regulator and rectifier. You should find this site helpful https://www.chinonthetank.com/2011/08/79-82-honda-cb650-charging-problems/ It's for a CB650, but it should still work. So I bought a 1981 CB750 about a year ago. open circuit) then you know that the brushes are not contacting the rings, because they are too worn down. with insulated leads & 1pc. Rectifier Only - 3 phase - 5 Wire - 3 AC in - 2 DC out. Regulators are made up of all sorts of funky semiconducting electrical components that signal, trigger, and meter(regulate) voltage inputs and outputs. 1971 CB750K1 (newest bike), 1996 Royal Enfield 500 Bullet (therapy bike), 1981 Yamaha XV920RH, 2006 Kawasaki Concours (retirement bike), 1975 Yamaha RD350 (race bike), 1989 Honda VTR250 Interceptor (race bike), 1986 Kawasaki EX250 Ninja (race bike in progress), 1985 Honda Elite CH250, 1973 Yamaha GT1 80cc, 1974 Yamaha DT360 project bike. - Honda CB 750 question. The Cycle X "high-output" charging systems will allow you to use many . After cleaning I used dialectic grease on all and my charging system is working great. The Fora platform includes forum software by XenForo. I use these almost everyday Im on the job. Place one lead on the wire and the other lead to a solid ground. I had a similar problem with my 750. Content on hondatwins.net is generated by its users. I am thinking vacuum or gas but I am stumped. 1. Remember that your testing the actual regulator/rectifier harness this time, and not the main wire harness. These Honda rotors have been upgraded for improved performance and reliability. could be that, theoretically. I started having issues with it last year and since then I have replaced the voltage rectifier, the rotor, the stator generator, the carbon brushes and The battery. Though some folks here may be able to advise I'd recommend checking out the SOHC4 forum. I had to do two roll-starts just to get it home. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Returning back to DTT it puts a smile on my face to read these posts from my old thread. You are using an out of date browser. im gonna hook the ac gen up to an oscilliscope and see wtf's goin on. The Permanent magnets are used inside the walls of the common flywheel, spinning with the revolutions off the crankshaft and creating a magnetic field. JavaScript is disabled. Test this wire by setting your meter to DC voltage reading. Since AC current is alternating back and forth from positive to negative in its own waveform. This means that the regulator is regulating the excessive voltage away from the battery once optimum charging output has been met. Another thing that is a problem area is the cam chain . Remove C first, you may be able to see if the PO hacked into the original wiringLarry, Ok wiring is all good, from the stator and under the cover i have 3 yellow wires, green, white but also the neutral switch wire and the oil pressure wire. Once the wire snaps, no more charging at all nothing. At 4K it shows 13.8 to 14.2 volts. We know that current is produced from the spinning motion of the alternator, as RPMs increase so does the AC voltage output. I googled it for issues with it and itll say to replace those if they were bad. The Fora platform includes forum software by XenForo. Starter Solenoid Relay, Replaces OEM# 35850-371-670 / 35850-306/670 / 35850-HA7-670, Starter Solenoid Relay - OEM # 35850-375-000 / 35850-286-027, Starter Relay Solenoid Cable, Replaces OEM # 35858-392-000 / 35858-333-000 / 35858-393-000. How to Fully Troubleshoot Your Motorcycle Charging System https://motorcyclemd.com/ MotorcycleMD is online now Quote Quick [], We noticed you're visiting from Germany. How do I test the rotor? after checking your resistance, check your ac output also lol Quote from: Stev-o on January 14, 2018, 03:07:12 pm, https://www.youtube.com/watch?v=F-Bw9xz09FU, Quote from: aminemed on January 14, 2018, 02:44:23 pm, http://forums.sohc4.net/index.php?topic=126401.0, http://forums.sohc4.net/index.php?topic=132935.0, https://www.cmsnl.com/classic-honda-fansite/honda_wiring_diagrams/CB750(K3-K7).jpg. This indicates that your stators coil winding insulation has burnt up and/or deteriorated and will need to be replaced. It will instantly start draining the battery. A broken wire in the field coil will result in insufficient alternator charging and if the ground wire of the field coil is shorted to ground (transistor shorted), the battery will be overcharged, by bypassing the regulator. (30 pages) Motorcycle Honda CB750 Shop Manual. CB750c 1981 weak charge issue. Its pretty crazy. Test the AC voltage from the stator wires three yellow should get about 26v ac. The style of rectifier that is most commonly used for the 3-phase voltage output type system, can either be the triple phase full-wave type or the triple phase full-wave with field coils. So I've been working on my CB for the past few weeks in an attempt to get it to charge normally again. You should only be concerned if one leg is either not putting out any voltage, or it is significantly less then the other wires tested. OEM # 31700-333-008 / 31700-323-015. 1. Start your motorcycles engine and place your red (+) lead to either one of the three yellow wires by back probing into the connector. Honda CB750A Hondamatic. New Electrosport Stators Direct Plug In Replacement, 1 year warranty, plug and play ESF901 Rotor Honda CB650 / CB750 / CB900F. The whole unit must be replaced as one. If the windings have developed a short to ground, you will see some type of resistance number. Cycle Forums: Motorcycle and Sportbikes Forum. Come join the discussion about performance, engine builds, classifieds, modifications, troubleshooting, maintenance, and more! Record your readings. '74 "Big Bang" Honda 750K [836]..'71 Honda 750K project..'76 Honda 550F..K3 Park Racer!and a Bomber!plus plus plus Have you looked at your bike's color diagram? Some ignitions may have multiple positions,. Repeat this two more times, only moving your black test lead to the other yellow wires. Read full answer. Honda 1981 CB 750 - Battery keeps going dead. Same goes for if you get an open (no numeric reading) through both ends of the diode. The engine is the 1.5-liter A-series four-cylinder, rated at 65 horsepower. He will fix you right up. You are using an out of date browser. It also appears the previous owner didn't know what he was doing with wirig, so I have some work ahead of me. Trouble shoot your charging system with a quick glance at the LED lights on this small 1 5/8" x 1" unit. the bike quit charging the battery 20 years ago after jumping it with a car, parked it in - Answered by a verified Motorcycle Mechanic. There are several available in the aftermarket though. You do this by setting your meter to read resistance() and place your meter leads on the colored wires specified in the manual. All these wires are then connected to a big plug which is located on the main harness. For a better experience, please enable JavaScript in your browser before proceeding. These readings should be closely in range of each other. [] the key on giving you battery voltage? You will not get that from any electrical parts supplier. High quality Part. A low or failing battery can cause crazy readings during your testing. Here is a link to a CB 750 forum that covers the DOHC CB 750s. Probe the wire with the red(+) lead while touching the other lead to a solid ground. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. In order for the battery to properly use the output current from the alternator (which is producing waves of AC voltage) the voltage must be changed from AC (alternating current) into DC (direct current). resistance or continuity through the stators windings. Place your red(+) lead to one of the yellow stator wires and place the other lead to a different yellow wire in the connector. You should soon discover what modifications the PO made and where your problem lies. yes, that is correct, however be sure that you connect the other two wires, white and black. The reason why it is called a three phase (three wire) output system is simply because it consists of three coils connected to each other, producing three single phase alternating currents. Honda cb750 sport motorcycle owner's manual (90 pages) It fluctuates 12-12.5V v depending on the battery charge and the rpm. Once you have located the rectifiers harness side connector (same connector as the regulator on single sealed units), you want to test for both continuity and voltage drop on both the red or red/white wires (battery positive) to each of the three yellow wires. 22v at idle up . Well let's take a look. His solid state regulator/recifier assy. Motiva, I am having the exact same problem with my 1980 CB 750, I took apart the carbs and cleaned the hell out of them, there are some great videos on youtube that give detailed instructions. Log in SOHC/4 Forum Archives. That means, that I have to charge the battery fully to use it again. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. At 4K RPM it gets about 14.4 volts. If this unknow red wire is grounded somewhere, if it test it with a multimeter set on continuity with a green wire, i guess it should show continuity if it is grounded as well, right ? *Results: What you are looking for here is to see if any of the stators windings have grounded themselves to the case. To accomplish this switch, the rectifier is made up of diodes. Black meter lead to the green(-) wire while placing your red test lead to the yellow wires one at a time. Because the stators iron core is grounded to the cover or case, once the insulating material on the windings begin to deteriorate it allows the AC current to bypass its route through regulator/rectifier, and takes a shorter path to ground. The main thing that will go wrong with the charging system is the rotor. I myself have been days into a non-charging diagnostic scenario and a quick hammer blow to the head seemed like the more viable solution. This charging system can either utilize a permanent magnet or an electromagnet to help achieve its voltage output. It's a PITA trying to deal with this system. Plus he offers a LIFETIME WARRANTY. i doused pretty much the whole bike in contact cleaner to no avail. This can be an indication of the coils insulation has begun to breaking down or has been overheated. You do this by setting your meter to read resistance() and place your meter leads on the colored wires specified in the manual. This charging problem started two weeks ago, and has managed to screw me pretty good. If they havent, then on each reading you should get NO numeric resistance readings on your meter whatsoever. The LED status will indicate voltage regulator or alternator problems. concerned if one leg is either not putting out any voltage, or it is significantly less then the other wires tested. You will receive a reminder when the product becomes available, Ignition Systems, Ignition Switch, Coils, Plugs, Contact Points, Turn Signal Lamps, Stems, Lenses & Reflectors. Check both over. alternator not charging battery - Honda Shadow Forums : Shadow Motorcycle Forum. An old Honda advertisement for the Honda CB750A Hondamatic. Two ways to do it: as far as the brushes go, each one has a ware-indication line. Wez_ C. Reg/rec . We use cookies to give you the best possible experience on our website. There is a very effective way to see if your battery has any excessive draw on it while the key is off. You will do this test three times on each of the three yellow wires. BIKE WON'T HOLD 13/14 VOLTS. The stator needs to be replaced. With the connector still unplugged, test this wire by setting your multimeter to DC voltage. Test this wire by setting your meter to DC voltage reading.

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