Question about Yamaha WR 450 F Motorcycles

1 Answer

I have a 2005 yamaha wr450 that wont start w/o choke on and wont idle w/choke off

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 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.

  • Master
  • 770 Answers

Your motorcycle is starving for fuel. The choke blocks off air and forces the fuel air mix to be richer than normal. Typically used for cold starts then when you take the choke off your engine is allowed to **** more air, even though the mix VOLUME is the same, the mixture is leaned out to accomadate your now warmed up engine for optimum performance. If you have a blockage, typically in a fuel filter, or a jet, or from the carb being dirty or plaqued, the engine sucks too much air because it can't get enough fuel, (mixture too lean), therefore you have to use the choke when you normally would not need to in order to over compensate. The fix is a through cleaning of the fuel system. You can start by changing the in line filter. If that does not do the trick it will be necessary to remove the carb, take apart and soak in carb cleaner, then blow out with compressed air. Particularily the jets. Be careful not to blow out a needle seat. You may want to remove those before blowing. Good Luck. This should fix you up! I hope you have found it very helpful!

Posted on Nov 16, 2009

  • Hal Hallman Nov 16, 2009

    I went to check and see if you'd responed to my post yet or accepted my solution and found that my solution had been sensored. where you see the ****, I used a 4 letter word that started with an S and ended with uck, not meant to be dirty, just telling you what your situation was, You can substitute the word Pull instead of the other if you have trouble getting the meaning of my solution.

×

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:

2 Answers

Why does my yamaha 660 only run if the choke is on? What causes it to backfire?


Most of the time it's because the Pilot/Idle jet is clogged in the carburetor. This most often happens because of old fuel sitting in the carburetor during long periods of sitting and non-use. The fuel forms a varnish - a gummy layer inside of your carburetor and clogs the tiny holes in the idle jet. Since fuel can't get through, the engine dies. The hole for the choke is larger, therefore the fuel can still get through it.

clogged carb jets Google Search

Jul 20, 2014 | Yamaha 2005 Grizzly 660 Auto 4x4

1 Answer

Yamaha wr450f kick start is jammed and electric


Hi, Anonymous for more information about your question and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
07 Wr450 Kick Starter lock up
WR450 07 won start
YAMAHA WR450F Owner Service Manual
OEM parts for Yamaha
YAMAHA WR450F Owner Manual

Aug 25, 2013 | 2005 Yamaha WR 450 F

1 Answer

Yamaha kodiak 450


hows it run once started, is the choke working. could have a rusted choke cable. once again this crappy gas may have destroyed the gaskets inside which been a real problem especially with 2 strokes.

Jul 02, 2013 | Motorcycles

1 Answer

Yamaha wr450 battery wont recharge


If the battery is completely dead you can go to autozone and get acid refills. The levels can sometimes get low. However, it sounds to me like you would be better off buying a new battery.

Jun 10, 2013 | 2009 Yamaha WR450F

1 Answer

When choke is off wont idle


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. 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.
11. Faulty fuel pump.
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.
YZ426 won idle without choke Intake Jetting Fuel Injection
YZ426F Won Run Choke 4Strokes com
Yamaha YZ426F Owner Service Manual
OEM parts for Yamaha
Yamaha YZ450F Owner Manual Page 3

Jan 15, 2013 | 2001 Yamaha YZ 426 F

1 Answer

2005 wr450 exhaust pipe is red hot coming out of head


Hi, Anonymous your motorcycle is a high-performance dirt bike designed to run flat out that being said if you are strolling down some scenic trail at a slow speed or letting the bike idle for a few minutes your header pipe will turn cherry red, why you ask? It is not a street bike, it is designed for competition and weight is a major factor all necessary components are of the smallest and lightest design necessary to maintain performance under extreme conditions ie. small radiator and inside frame oil reservoir that doesn't get cooled, the majority of your riding needs to be at high speed. 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.
2005 WR450 with red hot header
Glowing pipe question
YAMAHA WR450F Owner Service Manual
OEM parts for Yamaha
YAMAHA WR450F Owner Manual

Sep 09, 2012 | 2005 Yamaha WR 450 F

1 Answer

Yamaha 2005 TTR250 carburetor problems


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 please Click on the blue links below. Good luck and have a wonderful day.
Carb issues
2006 Yamaha Bruin 350 Starts idles dies won restart
Yamaha TTR250L Service Manual
OEM parts for Yamaha
Yamaha TT Owner Manual

Feb 26, 2012 | 2005 Yamaha TT-R 250

1 Answer

Put a new Yoshi pipe on my 05 WR450. Re-jet it but still bogs down in the low end and idles like it wants to die. issue with the needle valve? i cant figure out if it has too much air and not enough fuel...


try it with the choke on, if this helps it is lean
Try again with the hot start lever, if this helps it is rich
dynojet sell a good jet kit with pilots, mains and 2 needles(not needle valves)
sounds rich at idle

May 09, 2011 | 2005 Yamaha WR 450 F

1 Answer

We have a Yamaha WR450. We warm up bike and once we push the choke in the bike stalls.


Try to fix your jetting by making the fuel and air mixture richer or you may need to clean the carburetor.

Dec 29, 2010 | 2005 Yamaha WR 450 F

1 Answer

Yam ybr125 wont idle off choke,also cannot find idle control scre


you may need to replace your spark plugs

as the idle should remain constant as long as the tune of the bike is good IE oil changes done regularly / plugs cleaned and or gapped , air filter cleaned or replaced all of these can affect your bike.

hope this helps

Dec 13, 2008 | 2005 Yamaha TT-R 125 LE

Not finding what you are looking for?
Motorcycles Logo

Related Topics:

55 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...