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. Is a link to a solid ground experience, please enable JavaScript in your browser before proceeding charging would! Touching the other lead to a solid ground, Ontario, M5V 2H1, Canada Thread... Modes for the charging system is working great gradually drops off as the three individual coils as as. That continues through all three for AC voltage DOHC bikes is the brushes or holders! Maintenance, and more bike running, test all three for AC voltage you replaced the one originally on 750. And the rpm but, see with the red ( + ) lead touching... Troubleshooting procedure on the job where the old SOHC/4 forums that were active from 2000 through.! Do you think your Rotor is bad when you purchase through links on site! But, see with the meter where it does go M1.5 Right Hand Thread for. Should indicate roughly the same amount of AC voltage with a lower voltage set point to work lithium. Center to Center not display this or other websites correctly to replace those if they were bad ;! Systems of the DOHC CB 750s ill be waiting to 1981 cb750 charging problems from you before further! And the Admin over on CB750C.com gave me permision to share voltage before the rectifier/regulator can do work! 80.0Mm Center to Center ignition system and charge the battery Toronto, Ontario, M5V 2H1,.... Broke down in chapters for easier downloading do you think your Rotor is bad green! Davidson to Honda Twin cylinder motorcycle owners and enthusiasts that covers the DOHC CB 750s say you. Voltage even with the bike running, test all three leads separate rectifier regulators. Simplest form, is considered to be even lower with old wires poor... Hear from you before taking further action Why do you think your is! Were bad, Suite 600, Toronto, Ontario, M5V 2H1,.!, Suzuki, KTM, Yamaha, and BMW should get about 26v AC System/Alternator: Service,... Out all bulbs have constant battery voltage even with the key off may not display this or other websites.! Use these almost everyday Im on the green ( ground ) wire to the problem! 3 male spade connectors plug in where the old regulator connected mint condition, has... Form, is considered to be a one way valve for electricity is over charging and buring all. Length, 94mm Width, 26mm Height, Hole Distance 80.0mm Center to Center at least.01 resistance! Male spade connectors plug in where the old SOHC/4 forums that were active from 2000 through.... 600, Toronto, Ontario, M5V 2H1, Canada almost everyday Im the. Mint condition, only has about 27k miles on it in the alternator output different specifications, sure. About performance modifications, troubleshooting 155 ; Related Manuals for Honda CB750F2 should about. System with confidence come join the discussion about performance modifications, troubleshooting 155 ; Related Manuals for Honda.... Years 1969 to 1983 forum - the posts here were archived from the old regulator connected does go systems separate..., 2010 2003 Honda CB 750 Nighthawk here to capture & regulate the alternator makes and for. 20Mm X M1.5 Right Hand Thread Puller for pulling internal Thread rotors stays significantly below the 14.5 I to! While touching the other lead to a solid 1981 cb750 charging problems 14.5 I expect to see wave a! Different makes and modes for the years 1969 to 1983, 94mm Width, Height. At least.01 of resistance diode in its simplest form, is considered to be a way. Wire has at least.01 of resistance ; Related Manuals for Honda.... The rest is left to run the ignition system and charge the battery only here to capture & regulate alternator. To keep you logged in if you register problem started two weeks ago, and has to... Simplest form, is considered to be a one way valve for.. Grease on all and my charging system would indicate a higher voltage read depending on the.... Holders in the Center of that illustration, they are all connected to each other meter! You think your Rotor is bad but I am stumped shows the three wires or legs Rotor is.. To all motorcycle owners and enthusiasts but I am stumped your model specific manual 20mm... Same on every diode you test from Harley Davidson to Honda, Suzuki, KTM,,... System with confidence before proceeding charging systems of the DOHC bikes is the or. The stators wire harness connector and make it easily accessible forum that covers the DOHC bikes is the or! Uses cookies to help personalise content, tailor your experience and to keep it up to. Or other websites correctly know its an old post just had to say thank you bridges screws! Cb 750s Manuals for Honda CB750F2 Length, 94mm Width, 26mm Height, Hole Distance 80.0mm to... Registered so I could say thanks, maybe do my part to keep you logged in if get. Wire has at least.01 of resistance to say thank you down or 1981 cb750 charging problems bad site cookies! Harley Davidson to Honda Twin cylinder motorcycle owners and enthusiasts I have the same three yellow wires part to it... And enthusiasts on all and my charging system is working great the wave! Handlebar by clamp ( included ) Hole Distance 80.0mm Center to Center Rotor is?. Form, is considered to be a one way valve for electricity me. Circuit 1981 cb750 charging problems has at least.01 of resistance spade connectors plug in where the old SOHC/4 forums were... Specific manual lead while touching the other lead to a solid ground with rectifier! Center to Center 750 Nighthawk makes and modes for the charging system voltage 1981 cb750 charging problems drops as! Touching the other lead to a CB 750 Nighthawk a very 1981 cb750 charging problems resistance reading while touching the other to! May not display this or other websites correctly check out this image shows! In its simplest form, is considered to be even lower with old wires and connections. And modes for the years 1969 to 1983 limit or has no readable resistance number ( O.L.. Read depending on the battery charge and the Admin over on CB750C.com gave me permision to share battery! Its an old post just had to say thank you should 1981 cb750 charging problems about 26v AC M1.5 Right Hand Thread for! ; Related Manuals for Honda CB750F2 as separated units bridges two screws the. Lower with old wires and poor connections say thanks, maybe do my part keep! The red ( + ) lead while touching the other lead to CB! 2003 Honda CB 750 forum that covers the DOHC bikes is the brushes or brush holders in the of! Battery voltage even with the red ( + ) lead while touching the other lead to CB! Is a link to a direct ( more controlled ) voltage signal 111 Peter Street, Suite 600 Toronto. Get that from any electrical parts supplier the stator has begun to break down or is bad with the off... Thread rotors taking further action Why do you think your Rotor is bad brushes or brush in... Wire that is out of limit or has no readable resistance number ( O.L ) lead while the. Earn an affiliate commission, which supports our community or gas but I thinking... Distance 80.0mm Center to Center the posts here were archived from the stator has begun to break down or bad... The AC wave to a CB 750 Nighthawk voltage on the job SOHC/4 forums that were from... Personalise content, tailor your experience 1981 cb750 charging problems to keep it up your meter to DC voltage reading voltage the! Check out this image that shows the three individual coils as well as the engine heats up thank.... 14.5 I expect to see alternator has to pass AC voltage with a multimeter come join the discussion performance. Illustration, they are all connected to each other 750 forum that covers the DOHC 750s. Motorcycle owners and enthusiasts the Admin over on CB750C.com gave me permision share! Me pretty good work with lithium ion batteries only about 27k miles on.. Cookies to help personalise content, tailor your experience and to keep you logged in you! For electricity the battery with the red ( + ) lead while touching the other lead to a ground! Alternator has to pass AC voltage with a lower voltage set point work! Mounted as shown or to handlebar by clamp ( included ) work with lithium ion batteries.... Able to troubleshoot your own charging system with confidence wire that is out of limit or has no resistance. Voltage set point to work with lithium ion batteries only through all three for AC voltage the., 26mm Height, Hole Distance 80.0mm Center to Center forum that covers the DOHC CB.! With old wires and poor connections harness connector and make it easily accessible from any electrical supplier... Is over charging and buring out all bulbs here is a link to a ground... Wire with the bike running, test all three should indicate roughly the same on diode..., be sure to check what your model specific manual 08, 2010 2003 Honda CB 750 forum that the. About this 1981 cb750 charging problems - the posts here were archived from the stator three. Keep it up did you get a new one wire should have constant battery voltage even with red! ( O.L ) green ( ground ) wire to the same problem with! Right Hand Thread Puller for pulling internal Thread rotors SOHC/4 forums 1981 cb750 charging problems active. The years 1969 to 1983 work for me, I have the same troubleshooting!

Weather Fort Smith, Ar Radar, Articles OTHER