Question about 2003 Yamaha WR 450 F

1 Answer

Hesitation problems 2003 yamaha wr 450 f

I have hesitation problem off idle. The bike spits and sputters from 0 -1/4 throttle opening. Wide open runs great. I've adjusted the fuel/air mixture screw with no real results. screwed all the way in will not shut the bike down. I'm lost, please help

Posted by on

  • Anonymous Feb 17, 2009

    I have a 04 and have the same problem, Please help us.......!

  • Anonymous Mar 25, 2014

    When starting I have the choke on but not all the way, as the bike warms up I turn the choke down or completely off and sometimes it will not stay running. At times I give it throttle and there's a Slite hesitation

×

1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Sounds like a jetting issue. change the main jets starting from the largest one you own and work your way down.

Posted on Dec 14, 2008

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

Motorbike stuck on high revs


Hi, Anonymous and the usual suspects are:
1. Throttle cables improperly adjusted or pinched.
2. Idle adjusting screw needs to be backed off.
4. Air fuel mixture adjusted too lean start with 2 full turns.
5. Intake system air leak.
6. Fast idle choke ramp is not releasing.
7. Broken throttle return spring.
8. Damaged diaphragm or slide.
9. Faulty MAP, TPS, ATS, O2, sensors or wiring/connector
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Dirt Rider Magazine
Bike runs wide open after closing throttle
YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Dec 27, 2013 | 2003 Yamaha YZ 125

1 Answer

Bike spits and sputters at top end


Hi, Johnny and the usual suspects are:
1. Inlet system air leak.
2. Enrichener valve not seated or leaking.
3. Damaged or restricted fuel tank vent system.
4. Restricted fuel supply tract.
5. Dirty or damaged air cleaner element.
6. Plugged bowl vent or overflow.
7. Worn or damaged needle or needle jet.
8. Vacuum piston assembly malfunction.
9. Loose or plugged main jets or passages.
10. Improper float level.
11. Accelerator pumps inoperative.
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.
Testing the Power Valve Yamaha 2 Stroke
05 yz125 sputter at high rpm Yamaha 2 Stroke
YAMAHA YZ250 LC Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Dec 17, 2012 | 2003 Yamaha YZ 250

1 Answer

How do I adjust the carburator?


There are two needle screws that can be adjusted to make the engine run properly. Be certain that the carburetor is clean and the diaphragm is in good condition, and the fuel is new. The two needle screws mentioned above should initially be adjusted at one turn open from turned in all the way (lightly seated). Each of these needle screws performs different functions. One is for idle and throttle response (this screw is marked "L" and the other screw is marked "H". L and H are marked on the carburetor body and also on the plastic "shroud" near the adjustment screws. These screws are not interchangeable, being foolproof since the thread sizes are not the same. When properly adjusted the low speed screw (L) allows the engine to idle properly and throttle response will work properly. When the high speed screw is adjusted properly the engine will have correct power at full speed. Adjust the low speed screw so that the engine idles and when you squeeze throttle all the way to wide open the engine should not hesitate and should come up to full speed and when you drop the throttle it should idle nicely without stalling. Now adjust the high speed screw. Hold throttle wide open, holding it there while you adjust the high speed screw. If this scares you (be carefully so that the spinning chain does not cut you!) you may adjust the high speed screw at idle, turning it just slightly in or out. The high speed screw should be adjusted so that the engine does not run clean at wide open throttle but sputters slightly, slightly adjusted open from running clean to slightly sputtering. When under load (cutting a log) the engine should run clean. Good luck!

May 21, 2012 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

2003 yamaha yzf600r carbureted, When I twist the throttle (fast or slow) it sputters for a second then revs up and just sits at 4000 rpms, even if i just poke the throttle at idle it will rise up to 4...


Hi, Striker_1011 and the usual suspects are:
1. Throttle cables improperly adjusted, pinched or need lubrication.
2. Idle adjusting screw needs to be backed off.
4. Air fuel mixture adjusted too lean start with 2 full turns.
5. Intake system air leak.
6. Fast idle choke ramp is not releasing.
7. Broken throttle return spring.
8. Damaged diaphragm or slide.
9. Faulty MAP, TPS, ATS, O2, sensors or wiring/connector
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
YZF600R Forums View topic Weird idle surge issue
YZF600R Idle Problem Rev Problem
Yamaha YZF600 YZF600R 1994 2007 Service Repair Manual PDF Download Manuals...
OEM parts for Yamaha
Yamaha YZF600RP Owner Manual

May 02, 2011 | 2003 Yamaha YZF 600 R thunder cat

1 Answer

2001 WR250F WILL NOT IDLE AND BACKFIRES ON DECEL. AND SPITS/SPUTTERS WHEN THROTTLE IS APPLIED WHEN UNDER LOAD


these symptoms usually point toward lean on fuel for some reason
most common would be dirty or gummed pilot circuit and pilot jet I would remove carb and take out the pilot jet clean or replace with new - blow compressed air through the hole the pilot jet came out before reinstall
depending what altitude you are a bigger size pilot jet may assist this issue also but clean and replace original pilot jet and circuit first to confirm

Jan 02, 2011 | 2003 Yamaha WR 250 F

1 Answer

Engine smoke on de-cell/let off throttle/


The cylinder is in the front of the bike and on a down hill the oil in the crank case could be pushing past the ring. Yes, it could be an over full situation. Only run the recomended amount of oil. You can actually rob yourself of power and do damage by over filling. I've already seen a guy blow the soft plugs right out of his Yamaha by over filling the oil. Also, be careful when changing your air filter. It can be very easy to drop dirt inside and that will definately score your cylinder walls and cause permanent smoke. It is most likely exactly what you think it is. Good Luck.

Mar 30, 2010 | 2003 Yamaha WR 450 F

1 Answer

Warming up the bike on idle and noticed one of the exhausts was glowing red its a 1980 xs eleven special


soounds like a leaky exhaust valve to me,,,do a compreshion test first to check it could need the carbs reset up if its running week on one pot this could do it too

Mar 02, 2010 | 2003 Yamaha WR 450 F

1 Answer

Motor spits and sputters


If it is old enough to have points then I would check them and make shure they are clean and gapped at .020. if that is noth the problem then it sounds like a fuel issue. Either a weak pump or a dirty carb.

Aug 01, 2009 | Light Outboard Motor Boat Bass Fishing...

1 Answer

No top end


does it have diaphram in carb if so check for slack

Jun 21, 2009 | 2003 Yamaha WR 450 F

Not finding what you are looking for?
2003 Yamaha WR 450 F Logo

603 people viewed this question

Ask a Question

Usually answered in minutes!

Top Yamaha Experts

dhnguyen

Level 2 Expert

278 Answers

Steve Sweetleaf
Steve Sweetleaf

Level 3 Expert

1144 Answers

D. E. Hev

Level 3 Expert

1167 Answers

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

Answer questions

Manuals & User Guides

Loading...