Question about Honda CB 750 Nighthawk Motorcycles

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1984 Nighthawk 750 - won't charge on long runs...

I have a 1984 Nighthawk 750S, with 33,000 km. After a longer run (hour or so) the battery will not charge. Charges fine on a trickle charger at home. Mechanic has tested both stator and regulator - problem persisits all the same. Works fine on a short run - but they are not much fun are they?!

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When older electrical components are used for extended periods of time they heat up and become inafective and fail to perform, you should replace the voltage regulator.

Posted on Jul 16, 2009

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Posted on Jan 02, 2017

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Hi, Anonymous the answer to this question is way above my pay grade for this situation, I would call or visit my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry.
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1 Answer

1992 Honda CB 750 Nighthawk motor runs at idle only with choke on


Hi, Anonymous and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
http://www.fireblades.org/forums/honda-cruisers/81620-91-nighthawk-750-fuel-problem.html
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Feb 11, 2014 | 1992 Honda CB 750 Nighthawk

1 Answer

What is the wattage output on the 2001 750 nighthawk?


Ohms law comes into play here ... Volts x amps = watts ...
I don't think you are asking the right question ... lets try to work through this. Your motorcycle actually runs off the battery. Your alternator charges the battery as is required. It will not over charge because the regulator tells it to shut off when the battery is full. It does not go dead because when the battery is down, the regulator turns the alternator on and charges it back up. The alternator is constantly being turned on and off to maintain a full charge. When you fall below some charging criteria, your battery light comes on meaning you are using more power than you are producing. Normally, when the engine speeds up, so does the alternator and over comes this problem. Your battery is rated in Amp Hours ... lets say your battery is rated at 10 amp hours ... that means the battery will put out one amp for 10 hours before it is considered to be dead. Conversely, it will put out 10 amps for one hour before it is dead. Enter the alternator. I don't know what a farkle is or the amount of power it uses. I would certainly put a switch on it so I could disconnect it from the circuit.

Calculate your present use by adding the wattage of all the lights - compare that to the size of your battery - that should give you some idea of the slack you are anticipating.

12 volts X 10 amps = 120 watts.

Here is a very interesting article on Batteries for your consideration.

http://www.chem.hawaii.edu/uham/bat.html

Feb 07, 2013 | 2001 Honda CB 750 Nighthawk

1 Answer

1993 Honda CB 750 Nighthawk will not turn over


Hi, Anonymous before testing any electrical component in the Starting System it is "IMPERATIVE" that you have a fully charged battery of 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage, the battery is faulty and must be replaced. AGM type batteries fall into this scenario more so than lead acid batteries.
1. Ignition Switch not in the "ON" position.
2. Engine Run Switch in the "OFF" position.
3. Check the battery terminals for damage or corrosion check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter.
4. Bank angle sensor needs a reset or is faulty.
5. FOB battery low or dead.
6. Faulty ignition switch.
7. Faulty starter button.
8. Faulty kickstand, clutch, neutral safety switch.
9. Security alarm needs a reset.
10. Starter relay, solenoid, starter have failed or circuit wiring faulty.
11. Starter armature or field coils have failed.
12. Main fuse or circuit breaker may be blown or faulty.
13. Faulty ignition relay.
14. The electric starter is working but starter clutch has failed.
15. Check for engine trouble codes.
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Jul 30, 2017 | 1993 Honda CB 750 Nighthawk

1 Answer

Nighthawk 700S & 750S


soory about your trouble but it sounds like the yoke inside the starter itself is not engaging. If you know how or know someone that could take the starter apart and try to grease the yoke shaft so it can slide freely back and forth it should do the trick.

Aug 23, 2012 | 1984 Honda CB 700 SC Nighthawk

1 Answer

Head bolt torque and sequence for 1984 Honda VF 750 S


Hi, Anonymous for this scenario you will need your service manual, parts fiche, and owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Honda Magna VF750C Service Manual
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1 Answer

When I try and start it it just clicks


sounds like your battery is either low or knackered try a long 6-8 hour charge should do it if not battery could be knackered

Feb 21, 2011 | 2001 Honda CB 750 Nighthawk

1 Answer

1992 Honda CB 750 Nighthawk will not idle without choke


Hi, Emeraldcp and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
13. Faulty auto choke or wiring connection.
For more information about your issue and valuable "Free" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
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Sep 26, 2010 | 1992 Honda CB 750 Nighthawk

2 Answers

82 honda nighthawk 750


Possibilities are>
  • Wires not hooked up properly or a wire is disconnected
  • Bad rectifier or bad voltage regulator
  • Dirty or loose wire connections
  • Bad stator
Can I get a “very helpful” rating on this answer?

Aug 18, 2009 | 1992 Honda CB 750 Nighthawk

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