Question about Honda CB 750 Nighthawk Motorcycles

3 Answers

Engine stalls Bike barely stays running with full choke. If I crack open the throttle it cuts off. I found out that if I place my hand over the air intake that it runs OK... Possibly a bad Air injection control valve???

Posted by on

Ad

3 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 200 Answers

I assume your bike has been in storage for awhile...Your engine is running on choke ONLY, that's why when you cover the air inlet it's the same as what the choke does.....your jets in the carb are clogged and will facilitate a removal and cleaning of the carbs my friend.....find a trusted mechanic and you'll be rolling in no time...Good Luck to you......Tim

Posted on May 09, 2009

Ad
  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Sergeant:

    An expert that has over 500 points.

    Governor:

    An expert whose answer got voted for 20 times.

  • Expert
  • 190 Answers

May have water in carb bowls or clogged main jet

also check fuel vavle is suppling carbs enough fuel

Posted on May 09, 2009

Ad
  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

I already cleaned crabs but the problem still continues,....... Any more suggestion????

Posted on Jul 17, 2013

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Engine stalls out when shutting off the choke


Hey Bill, ...........My crystal ball is working fine..
Sounds like you need a professional carb cleaning and setting.. when a bike won't run unless the choke is on, its either the carbs need cleaning, or you have developed an air leak.. if the bike has been sitting for a length of time..its the carbs...once you get the carbs cleaned and set...you should be fine.. if it does nor correct the issue..please reply to me on here... thanks.. please rate as helpful...

Jul 14, 2017 | Motorcycles

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

Yamaha outboard engine. Model f20leha manufactured 5-2011, has about 30 hours on it. Sinse new engine is hard to start, after finally getting engine started, hard to keep it running untill engine gets...


have you left the choke open ? this mixes more fuel to the engine upon starting but will stall it if left open too long . check your fuel filter too it may be full of debris.

May 02, 2012 | Yamaha Boating

1 Answer

New to me 98 HD Springer, any tricks to starting in colder weather? Manual says not to give gas, what do the experts say?


"Manual says not to give it gas". This is correct. If your bike is equipped with fuel injection, the electronics control the fuel in a cold weather start.

In the event your bike is equipped with a carb, you must allow the enricher (choke) to do what it is designed to do. Allow me to explain how it works on a carburetor equipped bike.

A choke and an enricher circuit do the same thing, start a cold engine with an over-rich fuel mixture. But, they way they accomplish this is completely different. The choke is a plate in the mouth of the carb that limits the air intake of the carb making the fuel mixture rich. An enricher is a completely separate circuit within the carb. It has it's own venturi that runs parallel to the main venturi. When you pull the enricher, it opens this venturi and a fuel port that comes directly out of the float bowl. This supplies the air and the fuel to start the engine. But, it will only do that if the vacuum is pulling air through this venturi. If you "give it gas" or open the main venturi, the vacuum pulls the air through the main venturi rather than the enricher venturi and the engine does not want to start.

So, this is how I tell people to start their engine when it's cold. First turn on the fuel at the petcock. Then twist the throttle grip twice and go back to full close. Pull the enricher out, turn the switch on and use you index finger to push the start button. Do not open the throttle (give it gas) at all. The bike should start up and go to a high idle when it does start. The point is, when starting a cold engine with the enricher, do not crack the throttle open at all. Leave it shut. If you open it the lest little bit, it renders the enricher circuit inoperative. Leave that throttle shut.

Good Luck
Steve

Apr 09, 2011 | Harley Davidson FLSTS Heritage Springer...

1 Answer

2201 honda shadow ace 750. bike has been sitting over a year. replaced plugs, battery, got started but barely idles at full choke. A little throttle or push choke at all and it stalls. Tried Sea Foam...


You are correct about carb dissembling & cleaning bare min drop bowels & carb clean the jets idle & main any adj screws remove & spray out passages. count the turns so to replace screws to same place.. biker bandit may have some dias...

Apr 08, 2011 | 2001 Honda VT 750 CD Shadow A.C.E. Deluxe

1 Answer

I have a poulan pro pp4620avhd chainsaw. I can get it to start and stay running as long as I have the choke on. I can even run it at high speed using the choke control. When I pull the trigger to feed it...


Check the fuel filter and muffler for plugging. Check the fuel lines for condition. Check the carburetor fasteners for tightness. If the saw has a lot of hours, remove the lower section of the carburetor and check the condition of the diaphragm--it should not be hard/cracked. If everything seems to check out ok, Turn both jet screws CW to stops (lightly), then CCW each 1-1/2 turns. The engine should start and run--allow the engine to warm up. Pull the throttle full on and adjust H needle CW til the engine speeds up, but still 4-strokes. Proper adjustment is when the engine 4-strokes, but immediately 2-strokes when cutting. Let idle and adjust L CW so that the engine runs fairly well, but allows the engine to 'follow the throttle'. Adjust the idle speed screw so that the chain stops turning, but the engine continues to run. Hope this helps!

May 11, 2010 | Poulan Pro Chain Saw 46cc 20"

1 Answer

My 1984 rx7 starts when choke is pulled out. WHen engine warms and choke pulls in it stalls out. when trying to start it back up the engine sounds like it's trying to start, and it does when I pull the...


try removing air filter and spaying CARB CLEANER in carb while holding open intake rub thouroughly with hand in side carb, start vehicle and run... spray more cleane and by hand throttle open and spray reinstall filte and runner good on open stretch of highway.
see how that works

Apr 27, 2010 | 1983 Mazda RX-7

1 Answer

Automatic choke is getting stuck from time to time on my freelander xci where is the choke located and how to repair


you are looking for the air idel valve locted on the the inlet manifold it has a 1 inch hose coming off it going to the throttle valve pulling off the hosefrom throttle side and placing a finger over the end should make the engine stall if it doesen't stall you may have a cracked inlet manifiold .

Jul 08, 2009 | Land Rover Freelander Cars & Trucks

Not finding what you are looking for?
Motorcycles Logo

Related Topics:

611 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honda Experts

Arnie Burke
Arnie Burke

Level 3 Expert

4536 Answers

yadayada
yadayada

Level 3 Expert

76848 Answers

bazzz7071
bazzz7071

Level 2 Expert

342 Answers

Are you a Honda Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...