Question about 1992 Honda CB 750 Nighthawk

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

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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
77 CB750 only runs with choke won take any throttle
Honda CB750f2 Manual
http://www.partsfish.com/page/oem-parts-for-honda
Honda CB750F2 Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Posted on Aug 23, 2017

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Posted on Jan 02, 2017

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  • 30 Answers

SOURCE: idle problem: motor revs up and down at idle

it sounds like your idle control valve needs cleaning or replacing

Posted on Oct 08, 2009

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1 Answer

1992 Honda CB 750 Nighthawk replace air filter


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.
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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1 Answer

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Hi, Gracie 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.
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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.
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May 15, 2011 | 1992 Honda CB 750 Nighthawk

1 Answer

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Hi, Sawdust976 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.
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Apr 20, 2011 | 1992 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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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


Sep 26, 2010 | 1992 Honda CB 750 Nighthawk

1 Answer

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Hi, Msalwasser and the usual suspects are:
1. Installation of a different camshaft.
2. Different exhaust system or "STRAIGHT PIPES"
3. Faulty advance curve.
4. Multiple carburetors not in sync.
5. Improperly installed jet kit or wrong kit.
6. Carburetor internal malfunction.
7. Fuel mixture too rich.
8. Fuel mixture too lean.
9. Extremely dirty air filter.
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 01, 2010 | 1992 Honda CB 750 Nighthawk

1 Answer

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Hi, John 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.
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Feb 09, 2010 | 1992 Honda CB 750 Nighthawk

2 Answers

Where is the idle screw for cb nighthawk 750


follow your accel cable to the carb. move the throttle till you see where the linkage moves. look around the linkage to see what it hits on at no throttle. that will be your idle screw

Aug 01, 2009 | 1992 Honda CB 750 Nighthawk

1 Answer

Honda 750 stalls if throttle is opened unless choke is on.


Hmm , sounds like a vacuum leak, check all the hoses, and the rubber intake manifolds and clamps

Jun 18, 2009 | 1992 Honda CB 750 Nighthawk

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