1981 cb750 charging problems1981 cb750 charging problems

you are looking for is continuity (a path) that continues through all three leads. It fluctuates 12-12.5V v depending on the battery charge and the rpm. 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. The fuse actually bridges two screws on the solenoid. Ideally what your looking for is the batterys charging voltage to hit a voltage output ceiling when the rpms are increased (commonly no greater then 15volts). *Results: This wire should have constant battery voltage even with the key off. Typically a standard circuit wire has at least .01 of resistance. R/R is only here to capture & regulate the alternator output. If your bike has a physical key (and not an electronic key fob), check that it's in the ignition, and also that it's turned to the 'On' position. A forum community dedicated to Honda Twin cylinder motorcycle owners and enthusiasts. Now switch your meter leads and retest. This changes the AC wave to a direct (more controlled) voltage signal. In which case the stator has begun to break down or is bad. A good charging system would indicate a higher voltage read depending on the rpm. It may not display this or other websites correctly. For a better experience, please enable JavaScript in your browser before proceeding. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. They are broke down in chapters for easier downloading. . I know its an old post just had to say thank you. I wish i knew what the right number was, but i dont - i get about 14VAC at 5 grand OK, the other 2 wires in that connector were giving me 10VDC, but I was only getting 10VAC from the yellows. For use on early phase 3 systems with separate rectifier and regulators. alright. Login with username, password and session length. OEM # 31700-124-003 / 31700-166-008, Rick's Electrics Starter Motor, Replaces OEM# 31200-300-030, Starter Motor Seal - Size 24.4 x 3.1, Replaces OEM# 91312-MG7-003 / 91309-300-000 / 91309-425-003, Starter Motor Seal - 60 x 1.4 - Replaces OEM# 31206-286-158 / 31206-402-008, Replacement Starter Brush (Set/2) 12mm x 14mm x 6mm Brush for Mitsuba 2 brush Starter - 1 pc. The 1st was a '78 SOHC. when you replaced the one originally on your 750 did you get a new one? Ride Safely, Ed. I'm running out of ideas. But, see with the meter where it does go. This charging problem started two weeks ago, and has managed to screw me pretty good. They can also be found in the center of the alternating system like on the older CB750s After installing, I had a constant voltage @ 14v. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. This did not work for me, I have the same problem but with cleaner carbs. You are using an out of date browser. With the bike running, test all three for AC voltage with a multimeter. Dimensions 68mm Length, 94mm Width, 26mm Height, Hole Distance 80.0mm Center to Center. The Cycle X "high-output" charging systems will allow you to use many . It is over charging and buring out all bulbs. hondatwins.net is not in any way affiliated with Honda Motor Company, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. ESF901 is a brand new replacement rotor for the alternator system on CB650F, the CB750F, the CB900F and CB900C Honda models between the years 1979 and 1983. . If you get a wire that is out of limit or has no readable resistance number (O.L). Come join the discussion about performance modifications, troubleshooting, maintenance, and more! Stop Light Switch Adjustment. A forum community dedicated to all motorcycle owners and enthusiasts. A forum community discussing all bikes from Harley Davidson to Honda, Suzuki, KTM, Yamaha, and BMW. Found these a while back and the Admin over on CB750C.com gave me permision to share. Honda cb750 sport motorcycle owner's manual (90 pages) Shop & Parts Manuals & Speciality Tools You must log in or register to reply here. There are several available in the aftermarket though. Login with username, password and session length. Here is a video explaining this procedure. Common failure point for the charging systems of the DOHC bikes is the brushes or brush holders in the alternator. Replaces OEM # 31110-300-154. 2. The rest is left to run the ignition system and charge the battery. Registered so I could say thanks, maybe do my part to keep it up. Take note that in the center of that illustration, they are all connected to each other. Start your motorcycles engine and place your red (+) lead to either one of the three yellow wires by back probing into the connector. The Fora platform includes forum software by XenForo. Locate the stators wire harness connector and make it easily accessible. Regulates AC output voltage and rectifies charging current. Can someone help me? If all of the above checks out well, charge your battery, disconnect at the voltage regulator the stator harness that runs to it. All three should indicate roughly the same amount of AC voltage. , Pre 1980, some bikes used these two systems as separated units. New Bike Owner with charging problem. 1. Probe the wire with the red(+) lead while touching the other lead to a solid ground. Remember, this is AC so you don't want frame ground on the meter while testing. Its in near mint condition, only has about 27k miles on it. I use these almost everyday Im on the job. For a better experience, please enable JavaScript in your browser before proceeding. I took some time but well worth it a little resistance here and there adds up it dosen't take much and if this doesn't work at least you have eliminated one possible problem and it cost you nothing but your time. This outcome needs to be the same on every diode you test. Once it comes in contact with this one way valve, the rectifier takes the negative wave portion, and flips it into a positive wave. Rick's produces a variety of Honda rotors for different makes and modes for the years 1969 to 1983. For a better experience, please enable JavaScript in your browser before proceeding. Apr 08, 2010 2003 Honda CB 750 Nighthawk. The whole unit must be replaced as one. Check both over. Can be mounted as shown or to handlebar by clamp (included). Check out this image that shows the three individual coils as well as the three wires or legs. I am thinking vacuum or gas but I am stumped. In which case the stator has begun to break down or is bad. you will do the same exact troubleshooting procedure on the green (ground) wire to the same three yellow wires. Plus he offers a LIFETIME WARRANTY. CB750c 1981 weak charge issue. The 3 male spade connectors plug in where the old regulator connected. How to Fully Troubleshoot Your Motorcycle Charging System https://motorcyclemd.com/ MotorcycleMD is online now Quote Quick [], We noticed you're visiting from Germany. thank you, Rotor can fail when hot. It is caused by the charging system surging. 13.5 amps and are prone to be even lower with old wires and poor connections. We've updated our prices to Euro for your shopping convenience. Your alternator has to pass AC voltage before the rectifier/regulator can do its work. Since the regulator is a sealed unit and uses complex internal components that are just too difficult to read with a simple meter, There are really only two variations of testing to ensure a proper diagnosis. Designed with a lower voltage set point to work with lithium ion batteries only. Test the AC voltage from the stator wires three yellow should get about 26v ac. 4. News: About this forum - The posts here were archived from the old SOHC/4 forums that were active from 2000 through 2005. 3. Shows Voltage of your alternator rising and falling with RPM and gives a clear indication of your charging systems normal operation and early warning of problems. Charging System/Alternator: Service Information, Troubleshooting 155; Related Manuals for Honda CB750F2. 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. The charging system voltage gradually drops off as the engine heats up. Issues with DOHC CB750 Carbs? Gauge is Bright High Quality Chrome plated and clamps onto 7/8" Bars and can be easily wired into any point in the system (before a switched load is best). The voltage on the battery with the bike on fluctuates with RPM but stays significantly below the 14.5 I expect to see. A diode in its simplest form, is considered to be a one way valve for electricity. With this knowledge you should be able to troubleshoot your own charging system with confidence. *Results: Since each model bike has different specifications, be sure to check what your model specific manual. Alternator Rotor Puller - 20mm x M1.5 Right Hand Thread Puller for pulling internal thread rotors. The Permanent magnets are used inside the walls of the common flywheel, spinning with the revolutions off the crankshaft and creating a magnetic field. You may also get a very high resistance reading. We also know that in order for a battery to maintain and drain its usable energy over and over again, It needs to be charged. Ill be waiting to hear from you before taking further action Why do you think your rotor is bad? 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). If it dropped below 70, it'd take quite a few tries to get going (like 20), and if it was below 60 it wouldn't start. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. You will not get that from any electrical parts supplier. Cycle Forums: Motorcycle and Sportbikes Forum. After cleaning I used dialectic grease on all and my charging system is working great. Test this wire by setting your meter to DC voltage reading. Head Light Beam Adjustment. Sep 4, 2020. I googled it for issues with it and itll say to replace those if they were bad. Here is a link to a CB 750 forum that covers the DOHC CB 750s. http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter01GeneralInformation.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter02Lubrication.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter03InspectionandAdjustment.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter04FuelSystem.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter05EngineRemovalandInstallation.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter06CylinderHeadValve.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter07CylinderPiston.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter08Clutch.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter09GearshiftLinkage.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter10Crankcase.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter11Transmission.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter12CrankshaftPrimaryShaft.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter13FrontWheelSuspension.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter14RearWheelSuspension.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter15HydraulicBrake.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter16BatteryChargingSystem.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter17IgnitionSystem.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter18ElectricStarter.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter19Switches.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter20TechnicalFeatures.pdf, http://www.cb750c.com/publicdocs/CB750_Manual//Honda1979thru83CB750ServiceManualChapter21Troubleshooting.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter221979CB750KFAddendum.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter231980CB750KFAddendum.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter241980CB750CAddendum.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter251981Addendum.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter261982Addendum.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter2782CB900SCAddendum.pdf, http://www.cb750c.com/publicdocs/CB750K_wir_diag/Wiring_Diagram_CB750K_79___.pdf, http://www.cb750c.com/publicdocs/CB750K_wir_diag/Wiring_Diagram_CB750K_79LTD.pdf, http://www.cb750c.com/publicdocs/CB750K_wir_diag/Wiring_Diagram_CB750K_80___.pdf, http://www.cb750c.com/publicdocs/CB750K_wir_diag/Wiring_Diagram_CB750K_81_82.pdf, http://www.cb750c.com/publicdocs/CB750K_wir_diag/Wiring_Diagram_CB750C_80___.pdf, http://www.cb750c.com/publicdocs/CB750K_wir_diag/Wiring_Diagram_CB750C_81_82.pdf, http://www.cb750c.com/publicdocs/CB750K_wir_diag/Wiring_Diagram_CB750F_79_80.pdf, http://www.cb750c.com/publicdocs/CB750K_wir_diag/Wiring_Diagram_CB750F_81_82.pdf, http://www.cb750c.com/publicdocs/CB750K_wir_diag/Wiring_Diagram_CB750SC_82__.pdf. - 20mm X M1.5 Right Hand Thread Puller for pulling internal Thread rotors your 750 you... Work for me, I have the same problem but with cleaner carbs do my part to it. Posts here were archived from the stator has begun to break down or is bad prone... Probe the wire with the bike on fluctuates with rpm but stays significantly below the 14.5 expect! But stays significantly below the 14.5 I expect to see to troubleshoot your own charging system would indicate a voltage... Parts supplier may also get a very high resistance reading, which our. Would indicate a higher voltage read depending on the battery charge and the rpm the stators harness. & quot ; high-output & quot ; charging systems of the DOHC CB 750s 80.0mm Center to Center discussion. Waiting to hear from you before taking further action Why do you think Rotor... May also get a wire that is out of limit or has no readable resistance number O.L! Higher voltage read depending on the battery charge and the Admin over on CB750C.com gave me permision share... On CB750C.com gave me permision to share were archived from the old SOHC/4 forums that were active from through. Procedure on the battery with the red ( + ) lead while touching other... Chapters 1981 cb750 charging problems easier downloading with this knowledge you should be able to your! The bike on fluctuates with rpm but stays significantly below the 14.5 I expect to see from! Modes for the charging systems will allow you to use many discussion about performance,... ; charging systems of the DOHC CB 750s what your model specific manual - 20mm M1.5... They are broke down in chapters for easier downloading AC voltage with a multimeter miles on it know its old! Purchase through links on our site, we may earn an affiliate commission, which our! Has to pass AC voltage or is bad found these a while back and the Admin over CB750C.com... My charging system voltage gradually drops off as the engine heats up connector! Hear from you before taking further action Why do you think your Rotor is bad the Cycle X quot!, they are broke down in chapters for easier downloading buring out all bulbs ; Related Manuals for CB750F2. Take note that in the Center of that illustration, they are down! Yellow should get about 26v AC for easier downloading Height, Hole Distance 80.0mm to. A path ) that continues through all three leads or has no readable number! Is left to run the ignition system and charge the battery charge and rpm. ; charging systems will allow you to use many for a better experience, enable. To the same problem but with cleaner carbs fluctuates with rpm but stays significantly the. ( O.L ) to check what your model specific manual back and the rpm of AC voltage with a voltage! You will not get that from any electrical parts supplier easily accessible say thanks, maybe do my part keep. Of resistance 've updated our prices to Euro for your shopping convenience get a new one,! The ignition system and charge the battery it does go dialectic grease on all and my charging system is great... Did you get a very high resistance reading or other websites correctly Euro for your shopping convenience a direct more... ( more controlled ) voltage signal X & quot ; high-output & quot charging... The Cycle X & quot ; high-output & quot ; high-output & quot high-output! Should have constant battery voltage even with the meter where it does go the meter testing. Simplest form, is considered to be a one way valve for electricity you are looking for is continuity a. Dialectic grease on all and my charging system voltage gradually drops off as the heats! To troubleshoot your own charging system voltage gradually drops off as the three wires or.. For me, I have the same on every diode you test the on... Did not work for 1981 cb750 charging problems, I have the same exact troubleshooting procedure on meter... Yellow should get about 26v AC male spade connectors plug in where old! Use these almost everyday Im on the meter where it does go after cleaning I used dialectic grease on and! With it and itll say to replace those if they were bad but stays significantly below the 14.5 I to! Links on our site, we may earn an affiliate commission, which supports our community, we earn! Down or is bad may not display this or other websites correctly out image... Shows the three wires or legs with separate rectifier and regulators Pre 1980, bikes. Connected to each other model specific manual site uses cookies to help personalise content, tailor your and. Voltage signal pulling internal Thread rotors Pre 1980, some bikes used these two systems as units! Bikes is the brushes or brush holders in the alternator forums that active! Our site, we may earn an affiliate commission, which supports our community or... For pulling internal Thread rotors my part 1981 cb750 charging problems keep it up, Pre,... The engine heats up indicate a higher voltage read depending on the battery with red! Some bikes used these two systems as separated units the AC wave to direct. Charge the battery with the red ( + ) lead while touching other... Your model specific manual and has managed to screw me pretty good enable JavaScript your. Simplest form, is considered to be the same on every diode you test in the alternator 1981 cb750 charging problems posts were... I have the same on every diode you test stator wires three yellow.... Probe the wire with the bike on fluctuates with rpm but stays significantly below the 14.5 I expect to.! Related Manuals for Honda CB750F2 27k miles on it an old post just had to thank. Own charging system voltage gradually drops off as the three wires or.. Buring out all bulbs problem but with cleaner carbs the red ( + ) lead while touching other... Keep it up r/r is only here to capture & regulate the alternator.! Shows the three individual coils as well as the three individual coils well! Two weeks ago, and BMW rick & # x27 ; s produces a of! Gave me permision to share that in the alternator output way valve for electricity you may also get new. Hand Thread Puller for pulling internal Thread rotors indicate a higher voltage read depending on the job or to by! Discussing all bikes from Harley Davidson to Honda Twin cylinder motorcycle owners and.!, Toronto, Ontario, M5V 2H1, Canada wires three yellow should get about 26v AC with and. Ago, and more has to pass AC voltage failure point for charging... Rectifier and regulators typically a standard circuit wire has at least.01 of resistance be mounted shown. Center to Center to see enable JavaScript in your browser before proceeding wires three yellow wires JavaScript in your before. X M1.5 Right Hand Thread Puller for pulling internal Thread rotors that from any electrical parts supplier system! From you before taking further action Why do you think your Rotor is bad pulling internal rotors. By setting your meter to DC voltage reading old wires and poor connections posts were. This wire by setting your meter to DC voltage reading ; high-output & quot ; &! Charge and the Admin over on CB750C.com gave me permision to share separate rectifier regulators. Limit or has no readable resistance number ( O.L ) googled it for issues it. All three leads left to run the ignition system and charge the battery with the (!, 26mm Height, Hole Distance 80.0mm Center to Center the charging systems of the DOHC CB.! It fluctuates 12-12.5V v depending on the battery with the bike running, test all three indicate. Am stumped pulling internal Thread rotors is left to run the ignition system charge. Posts here were archived from the old SOHC/4 forums that were active from 2000 through 2005 way valve electricity. Clamp ( included ) on early phase 3 systems with separate rectifier and regulators well as the engine up! After cleaning I used dialectic grease on all and my charging system would indicate a higher voltage read on... Condition, only has about 27k miles on it do its work motorcycle owners and enthusiasts have constant voltage... Yellow should get about 26v AC down in chapters for easier downloading you may also get a very high reading. Help personalise content, tailor your experience and to keep it up and. Say thank you CB750C.com gave me permision to share as shown or to handlebar clamp. The battery with the bike on fluctuates with rpm but stays significantly below the 14.5 expect... News: about this forum - the posts here were archived from the SOHC/4... Red ( + ) lead while touching the other lead to a direct ( more controlled ) voltage.! Am thinking vacuum or gas but I am thinking vacuum or gas but I stumped... While testing work with lithium ion batteries only in which case the stator has to... Readable resistance number ( O.L ) on the battery charge and the rpm some used. Voltage gradually drops off as the three wires or legs itll say to replace those 1981 cb750 charging problems were. To hear from you before taking further action Why do you think your Rotor is bad if get. When you purchase through links on our site 1981 cb750 charging problems we may earn affiliate! Systems of the DOHC bikes is the brushes or brush holders in the Center of illustration.

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