Question about 1992 Honda CB 750 Nighthawk

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

My 1992 Honda Nighthawk starts up pretty easily but even when it is fully warmed up the engine wants to stall as so as I open the throttle, even slowly, unless the choke is on.

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  • Anonymous Mar 13, 2014

    my honda izy starts on full throttle and ticks over when i rev it up it stalls

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  • 52 Answers

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

Posted on Jun 18, 2009

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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
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

Feb 11, 2014 | 1992 Honda CB 750 Nighthawk

1 Answer

1997 Honda CB 750 Nighthawk stalls out when you give it gas.


Hi, Anonymous and the usual suspects are:
1. Idle port, transfer ports, slow air jet clogged.
2. Idle adjusting screw set too low.
3. Air fuel mixture adjustment too lean.
4. Pilot/slow fuel jet clogged.
5. Faulty accelerator pump.
6. Float level too low.
7. Float bowl contaminated old fuel, water, dirt, rust, etc.
8. Carburetor bowl vent line clogged/blocked/pinched.
9. Fuel line to carburetor kinked or pinched.
10. Fuel filter clogged.
11. Intake manifold leak.
12. The gas cap is not venting properly or fuel tank venting system blocked.
13. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
14. Needle and seat stuck closed in the float bowl.
15. Multi carburetors not in sync.
16. Faulty fuel pump.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Starts choke but dies with little throttle
Bike idles perfect but dies when given the slightest amount of throttle 93...
Honda CB750F2 Owner Manual
http://www.partsfish.com/page/oem-parts-for-honda
Honda CB750F2 Service Manual

Dec 02, 2012 | 1997 Honda CB 750 Nighthawk

1 Answer

1992 Honda CB 250 Nighthawk only runs with choke on


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.
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.
rebel 250 idles only on choke and dies when give it some throttle
Oakys Garage Carb clean Pilot Jet clogged Won run without Choke Carbs 101
Honda CB250 Shop Manual
https://www.partsfish.com/page/oem-parts-for-honda
Honda CB250 Nighthawk Owner Manual

Oct 21, 2012 | 1992 Honda CB 250 Nighthawk

1 Answer

My 1996 VF 750 C Magna starts fine with the choke open. After a minute or so as I reduce the choke and try to open the throttle, the engine just stalls out. Cannot seem to get the throttle to control


I think you are mixed up. The choke is usually closed to start a cold engine and opened once the motor warms up. The choke is closed to restrict the air flow and make the mixture richer in fuel. You can't open a choke that's already open. It's stalling because it's starved of fuel. Either a blockage or the fuel pump is not supplying enough gas.

May 06, 2012 | 1996 Honda VF 750 C Magna

1 Answer

My 1993 Honda Knighthawk wont run.


The slow circuit of your carbs are dirty. you need to remove the carbs from the bike and thoroughly clean the internal passageways and jets. that should solve the problem. Always drain your carbs for storage and use fresh gas when you start up after long storage.

May 15, 2010 | 1993 Honda CB 750 Nighthawk

1 Answer

Motorbike stalls when openeing throttle or turning choke off.


You've most likely got plugged up carburetor jets. The openings in the jets are so small that it can be very difficult to tell when they're plugged up - and this makes them clogg very easily, too.
The only other possible cause of the trouble you describe would be an air leak between the carburetor and the engine, a leak at the head gasket or cylinder base gasket, or a leaking crankshaft seal.

Nov 03, 2009 | Honda NSR 125 Motorcycles

1 Answer

Even after warm up with choke on it has hesitation on acceleration my 1993 honda 750 ,if i leave the choke lever at about 1/4 on it makes it a little more ridable . it ideiles fine


Usually if it runs better with the choke on that is a sign that the fuel mixture is too lean. When you engage the choke, it allows less air into the fuel mixure correcting the fuel mixture. If you have made no changes to the intake or exhaust system chances are your carburators are gunked up a little and not letting enough fuel through.

Oct 06, 2009 | 1993 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

1993 Honda Nighthawk Stalls w/out choke on


make certain it has compression and has spark and is getting plenty of fuel and the air filter is clean. clean carbs air filter and fuel filter and new plugs.

May 27, 2009 | 2004 Honda VT 750 Shadow Aero

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