Question about Motorcycles

1 Answer

4af carburetor engine is leaking fuel on the manifold

Posted by Pieter Kneg on

Ad

1 Answer

Andrew Taylor

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

  • Motorcycles Master
  • 31,538 Answers

Take the carb off and clean all the jets, needles and float.

In future please state year make and model rather than a '4af'.

Posted on Nov 10, 2019

Ad

2 Related Answers

TDISLine

TDISLine

  • 1874 Answers

SOURCE: DTC'S ARE PO171 AND ENGINE

Jaguar S Type MY 2004:
DTC fault code (EOBD Code): P0171 - Fault location = System too lean, bank 1. (Bank 1 is the right side of the car "V" cylinder block).
Probable cause: Intake / exhaust leak, air system, MAF / VAF sensor, fuel pressure / fuel pump, injector(s), heated oxygen sensor HO2S.

Instructions:
1. Check for air leaks on the intake and exhaust systems. Repair & replace bad pieces if necessary.
2. Check the air system components - harness, connections.
3. Check and replace if necessary MAF / VAF sensor. MAF = Mass Air Flow, VAF = Volume Air Flow, sensor.
4. Check the fuel pressure. Replace the fuel pump and injectors if necessary.
5. Check and replace if necessary the bank 1 heated oxygen sensor HO2S.

Posted on Mar 20, 2011

Ad
tedalvarez20

Ted Alvarez

  • 193 Answers

SOURCE: parts trouble shooting

float valve is either stucked or debris between valve and seat overhaul carb clean float valve u can dyi or have a mechanic do it for you

Posted on Mar 15, 2014

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Engine stops when giving it gas and then it's hard to start


Hi, Anonymous and the usual suspects are:
1. Idle circuit and transfer ports clogged.
2. Air fuel mixture adjustment too lean.
3. Pilot jet clogged. 4. Faulty accelerator pump.
5. Float level too low.
6. Float bowl contaminated old fuel, water, dirt, rust, etc.
7. Float bowl vent or overflow tube clogged.
8. Fuel flow to carburetor restricted.
9. Intake manifold leak.
10. The gas cap is not venting properly or fuel tank venting system blocked.
11. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
12. Needle and seat stuck closed in the float bowl.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
Bike dies when you give it throttle
DOWNLOAD NOW Yamaha YZ450F YZ450 2003 2008 Service Repair Workshop Manual...
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

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

Mar 01, 2015 | 2004 Yamaha YZ 450 F

1 Answer

Enith carburetor diagram


Nobody has messed around with the ignition timing in any way?



If it has stood for a long time(i.e years..) the fuel may have degraded to the point that it\'s useless.



The carbs will smell of fuel, but are you sure that fuel is being pumped to them in sufficient quantity? Try disconnecting a fuel line, crank the engine a few revolutions to see if fuel is pumped out.



Try gravity feeding the carbs. Use a can of fuel connected to the carbs, held above the engine. Get somebody to crank the engine and see if it fires up. If the engine fires up, suspect the fuel pump.. or fuel lines.



An air leak can also cause non-starting. The usual cause is the inlet manifold gasket. Any air leaking through the gasket can cause your non-starting problem. Go back and check that no dirt has been picked up by the gasket before you fitted it/it hasn\'t been ripped. Check that the inlet manifold has been correctly tightened.



It doesn\'t sound as though you have much of a problem .. more of a \'niggle\'.

The link is for Zenith carburettors:



Zenith carburetor Google Search

Aug 20, 2014 | Cars & Trucks

1 Answer

1994 Kawasaki KX 250 has a vacuum leak


Hi, Anonymous your fuel delivery system by carburetor or fuel injection is bolted to the cylinder head by a metal intake manifold for some bikes and rubber boots in others, there is a rubber seal or gasket in between to ensure an airtight seal. The carburetor or fuel injection throttle body is bolted or clamped to the intake manifold also with a rubber seal or gasket in between to ensure an airtight seal. The downstroke of the piston creates a vacuum in the combustion chamber sucking in the air/fuel mixture. If there is a leak in the delivery system caused by, but not limited too, a failed seal, gasket, or rubber intake boot, extra air is sucked in creating a minor or major unbalanced fuel charge. The end results are high idle, that cannot be adjusted, exhaust popping and intake coughing. Your carburetor or throttle body also has throttle plate shaft seals, gaskets, and rubber diaphragms that can also fail. On new bikes, this is rarely an issue but Father Time catches up with everything eventually making older bikes a prime target. The best way to detect an intake leak is to have the engine running at your best idle and spray Carb Cleaner, Starting Fluid, WD40, Water etc. at the entire fuel delivery system beginning at the intake manifold to cylinder head junction working your way back to the carburetor or throttle body, depending on the size of the leak the RPM's will surge upwards a lot or just a little, if there is no change at all then there is no leak.
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.
How To Diagnose Motorcycle Vacuum Leaks
How to diagnose carburetor vacuum leaks on your motorcycle https://www.scribd.com/doc/121008272/KX125-KX250-94-98-Service-Manual
OEM Parts for Kawasaki
1994 Kawasaki KX250 Owner Manual

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


Mar 28, 2013 | kawasaki KX 250 Motorcycles

1 Answer

1998 Kawasaki VN 800 Vulcan Classic dies when I 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 or internal fuel line has pinholes.
17. Fuel injectors clogged or faulty.
18. Faulty throttle position sensor.
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.
Engine dies when giving gas or pushing in choke Kawasaki Vulcan Forum...
http://www.kawasakimotorcycle.org/forum/kawasaki-cruisers/64903-vulcan-800-engine-stalls.html
KAWASAKI VN800 Service Manual
OEM Parts for Kawasaki
Kawasaki VN800 Owner Manual

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

Mar 25, 2013 | 1998 kawasaki VN 800 Vulcan Classic

1 Answer

Starving of fuel


Remove fuel filler cap and retry.

If no luck then check the engine for a vacuum leak.
You can try placing your hand over the carb intake and cranking or running the engine. If you feel a lack of vacuum, then you may have a vacuum leak. Check the intake manifold for cracks or gasket leaks.
Do a compression test on the engine. If it lacks compression, then it may also lack vacuum and may likely require major attention.

Nov 04, 2012 | Cars & Trucks

1 Answer

Motor can not run good


Make sure fuel is not older than 2 weeks. If an ethanol/oxygenate free premium is available- run only that through it- it has better storage characteristics.

If fresh fuel does not remedy the problems, first check for vacuum leaks at the mating flanges between carb and manifold and manifold to engine- idle speeds up when a leak is sprayed with carb cleaner. If that does nto remedy it or no leak found service the carburetor. It is likely dirty and may have corrosion if ethanoil is used in your area as an oxygenate.

Sep 23, 2012 | Welding Tools

2 Answers

Hey. I recently purchased a hyosung GV250 with very low miles on it (316). I'm now only getting about 50 miles of riding per tank and the engine bogs down sometimes in first and second gear. I'm...


fix the leak first the see if you still have a problem
it could have the float level set too high or have an incorrect main jet size ( drilled out by a previous owner wanting more power )

Jun 04, 2017 | 2005 Hyosung GV 250 Aquila

1 Answer

1986 Yamaha FZ750 - engine will start and idle - won't rev up. (engine quits)


Hi, Carefree22 and the usual suspects are:
1. Idle circuit and transfer ports clogged.
2. Air fuel mixture adjustment too lean.
3. Pilot jet clogged.
4. Faulty accelerator pump.
5. Float level too low.
6. Float bowl contaminated old fuel, water, dirt, rust, etc.
7. Float bowl vent or overflow tube clogged.
8. Fuel flow to carburetor restricted.
9. Intake manifold leak.
10. The gas cap is not venting properly or fuel tank venting system blocked.
11. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
12. Needle and seat stuck closed in the float bowl.
13. Multi carburetors not in sync.
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.
Bayou 300 idles but won rev
my bike starts runs idles perfectly but will not rev
1985 1988 YAMAHA Genesis FZ750 Service Manual Repair Manuals AND Owners... $10
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-fz-owners-manuals

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

Sep 20, 2010 | 1986 Yamaha FZ 750 TV (Europe)

2 Answers

Carburator pipes


As I know there is a vacume pipe from engine to carburetor, this vacume pipe is installed on top of engine cover to under carburetor (between carburetor and the inteke manifold).

Aug 27, 2008 | 1990 Toyota Corolla

Not finding what you are looking for?
Motorcycles Logo

Related Topics:

36 people viewed this question

Ask a Question

Usually answered in minutes!

Top Motorcycles Experts

Arnie Burke
Arnie Burke

Level 3 Expert

6221 Answers

Marvin
Marvin

Level 3 Expert

85231 Answers

richard libby

Level 2 Expert

209 Answers

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

Answer questions

Manuals & User Guides

Loading...