Question about 2002 Yamaha YZ 426 F

1 Answer

Bike dies when increasing rpm's. Idle's fine.

Bike's been sitting about 18 months. Put in fresh fuel, cleaned carburetor, and bike idle's ok, but when the throttle is increased and rpm's rise the bike chokes out and putters. What could it be?

Posted by on

  • mikeb103 May 11, 2010

    Did you have an in-line filter?

  • Brian Anderson May 11, 2010

    Take the spark plug out and see what it looks like. If it is a light tannish color and dry, then you have a fuel problem. If so then take your carb apart again and make sure all the old gas turned to varnish is out of the carb and especially the jets. Make sure you have good flow of gas from the gas tank. If the spark plug is dark and wet then it is a spark issue and I would look at the coil as the symptoms you describe could be your coil going bad or your CDI unit unless you have a connection problem somewhere. Good Luck

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 90 Answers

Hi!!
The spark plug has shortted....
Change the same and all will be well.

Regards
Berry

Posted on Jan 31, 2010

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

Idles with 1/2 choke. If open choke, or throttle - engine dies without any RPM spike. Carb was cleaned, jet is clean. When idles, there is gas in the primer bulb.


Hi, Andrew 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. Float needle and seat sticking.

5. Float level too low.

6. Carburetor bowl vent line clogged/blocked/pinched.

7. Idle adjusting screw set too low.

8. Air/fuel mixture screw set too lean.

9. Idle port, transfer ports, slow air jet clogged.

10. Slow fuel jet clogged.

For more information about your issue and valuable free downloads that you will need please visit the websites below. Good luck and have a nice day.

Bike won Run without Choke

Dirt Rider Magazine

Bike starts up idles on choke dies with choke off our when warm XS650 Forum

What could be wrong if bike will only run on choke

Mar 10, 2016 | GAS Motorcycles

3 Answers

I recently purchased a 1978 Honda Goldwing. It had some old gas in the tank so I removed the old gas and replaced the fuel filter. The bike was idling fair before now it's extremely high. Does this...


If the bike was idling OK when you ran it on the old gas, maybe the carbs were adjusted while the old gas was in the tank. The new gas could have cleaned the fuel system some and that's why your idle jumped. The fuel filter will definitely not cause your idle to go higher so no need to worry there.

Jun 28, 2011 | 1978 Honda GL 1000 (K3)

1 Answer

2005 Honda CRF 450 R idle adjustment


Hi, Haselhuj you need to make sure you have no intake leaks by spraying some Brake Kleen, Contact Cleaner, Starting Fluid etc. around the intake manifold and seals, if the RPM's go up or down significantly then you have a leak that needs to be fixed before you can continue with the carburetor adjustment.
The engine should be at operating temperature with the enrichener off to set the idle between 950-1050 rpm. Turn the idle skrew clockwise to increase the idle speed and counterclockwise to decrease the idle speed. If you have access to your air fuel mixture skrew you may turn it as well, if not there is a video below on how to gain access, make sure you start with clean or new spark plugs. Gently turn the air fuel mixture skrew clockwise until it starts to bottom out "STOP" do not over tighten as it will damage the taper on the end, now back the skrew out 1-1/2 full turns to establish a starting point start the engine and check the idle rpm's and turn the idle skrew accordingly for 950-1050 rpm if necessary, turn the air fuel mixture skrew 1/4 turn at a time and let the engine settle for about 10 seconds, turn the skrew clockwise for a leaner mixture and counterclockwise for a richer mixture, you are seeking the highest rpm your air fuel mixture skrew can acquire without going past 3 full turns from bottom then resetting the idle skrew back down to 950-1050 rpm If you can not detect any rpm change and can not stall the engine by turning the air-fuel mixture skrew all the way in then your pilot/low-speed jet is too big and needs to be replaced with the next size smaller. Final adjustment should be made with a clean air filter mounted to the carburetor.
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.
Idle adjustment screw
How to Adjust Idle On Dirt Bike Tips and Tricks 1
Honda CRF450X 2005 Service Manual
http://www.partsfish.com/page/oem-parts-for-honda
Honda CRF450R Owner Manual

May 28, 2011 | 2005 Honda CRF 450 R

2 Answers

Good morning, i have a Honda CM 450 A HONDAMATIC . The bike starts with no problem but when i put the first gear the engine stops. It was runing good a month ago. It has been in the garage for a beat more...


There has been storage problems with the fuel we now have with ethanol. When storing or parking for more than a week or two, the fuel sets in the tank and carb and plugs jets and small passages. Sometimes, and I say sometimes, putting SeaFoam, Lucas, or other carb and fuel injection cleaner in the tank and running it at a high idle will help. When you are able to put in gear and it keeps running, ride it several miles ensuring it will keep running.

If the cleaner doesn't do the trick, then the carb or carbs need to be dissasembled and cleaned.

Apr 10, 2011 | Honda CX 500 A Motorcycles

1 Answer

My gs500f is back firing through the CARB. the carbs where removed and cleaned they where in good codition.when the suzuki mechanic reassembled the bike and started it the bike dosent want to adjust down...


Lean mixtures burn very slowly, at times slowly enough to continue burning through the power and exhaust stroke, causing a backfire when the intake valve opens, and that flame gets a shot at the new mixture charge.

In normal operation, as the engine slows, the fuel delivery from the main circuit falls off, and the idle circuit is supposed to take over. If the idle circuit flows insufficiently, that becomes a transition to fuel starvation.

You can try pointing an unlit propane torch into the inlet air, and see if you can get closer to an idle while supplying a supplementary fuel source. You will need to do this in a way that gets propane to both carburetor inlets, maybe rigging a Y with vacuum hoses and electrical tape...

This started with work on the carburetors, so the fuel system would be the most suspect. That, and the fact that it will run at higher RPM would seem to rule out fuel delivery.

I was looking around at photos while developing this answer (needed to know whether this was a twin or a 4-cylinder), and one resource said the idle speed should be 1,200. I don't know if that's right, but maybe 1,000 RPM is too slow for this motor to keep it together. (I do doubt that, though.)

When I wrote that last sentence, I started to second guess myself, thinking "What if the fuel shutoff(s) is/are vacuum operated, and as the bike approaches idle there is insufficient vacuum to hold it/them open?" But the I rejected that, because there is even less vacuum at cranking speeds, yet the bike starts.

Jun 26, 2010 | 2005 Suzuki GS 500 F

1 Answer

Cutting out at idle


the batery is ok if the engine start avery time. Also the volts are ok.
Have you made any modifications on it? Sport exhaust, sport air filter?
Check also the air filter. Make sure is clean...
Idle speed should be around 1000-1200 rpm. You should have a screw to fix the idle speed. Check it on the carburetors area, or download the manual from internet.

Cheers.

Apr 12, 2010 | 2003 Suzuki SV 650

2 Answers

Engine cuts out with clutch engaged.


idle adjust?
there SHOULD be an adjuster under the seat or gastank within easy reach. Clockwise to increase rpm, ccl to decrease rpm. idle around 1400rpm when engine is at normal operating temp. Good luck!

Aug 04, 2009 | 2002 Yamaha YZF-R1

2 Answers

Will only run in full choke mode


Try a fuel additive to clean the system, also if the airfilter is dirty or damp, this can cause problems.
You may even have a rust problem in the barrels.
Or even the engine oil may have thickened causing a resistance in the crank bearings, so flush the engines oil ways if other solutions don't work.

Jun 18, 2009 | 1997 Honda VT 1100 C Shadow Spirit

1 Answer

Virago 250 fuel problem


Hi, Austparts and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Failed alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Failed main circuit breaker or ignition switch, check for loose connections and continuity.
5. Failed system and or ignition relay, check for continuity.
6. Failed ignition coil, ignition/electronic module.
7. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.
9. Air/fuel mixture screw improperly adjusted.
10. Accelerator pump damaged or not working.
11. Water or dirt in the fuel system, carburetor or filter.
12. Restricted, blocked or kinked fuel line.
13. Fuel tank empty.
14. The gas cap is not venting properly or fuel tank venting system blocked.
15. A failed fuel pump, pressure regulator and or fuel injectors.
16. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
17. Needle and seat stuck closed in the float bowl.
For more information about your issue and valuable "FREE" downloads that you need please click on the links below. Good luck and have a nice day.
Virago XV250 Choke and Idle Problem Premium fuel
engine stalls or dies suddenly help please
http://www.groussin.com/multi/XV250.pdf
OEM parts for Yamaha
http://www.starmotorcycles.com/assets/service/manuals/2005/LIT-11626-18-21_1000.pdf

May 15, 2009 | 1989 Yamaha Xv 250 Virago S

1 Answer

Idle problem when warmed up


Hi there!

On the carburetor, there is an idle knob. Make sure it is not set too high. This is normal during a cold start so make sure to adjust the idle knob back at 1,100 RPM after your engine is warmed up.

Also, make sure the choke system is clean and is free. Throttle cable should have an allowance of just about .8cm.

The engine idle may also be controlled with the thermostat connected to the grill fan. it will normally idle up to about 2,000 rpm when it senses that the engine is too hot but not 4,000.00 make sure this system is working well.

let me know if this helps
-levibit

Mar 29, 2009 | 1999 Suzuki GSX-R 600

Not finding what you are looking for?
2002 Yamaha YZ 426 F Logo

Related Topics:

263 people viewed this question

Ask a Question

Usually answered in minutes!

Top Yamaha Experts

dhnguyen

Level 2 Expert

281 Answers

Steve Sweetleaf
Steve Sweetleaf

Level 3 Expert

1144 Answers

Tony

Level 3 Expert

2600 Answers

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

Answer questions

Manuals & User Guides

Loading...