Question about 2003 Honda CRF 450 R

1 Answer

2003 Honda CRF 450 R misfires

Crf450 misfire high rpm@

Posted by Anonymous on

Ad

1 Answer

  • 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.

  • Honda Master
  • 43,124 Answers

Hi, Anonymous and the usual suspects are:
1. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a cursory reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead-acid batteries.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Spark plugs in bad condition or partially fouled.
4. Spark plug cables in bad condition and leaking check for spark leakage in the dark
5. Spark plug gap too close or too wide.
6. Faulty ignition coil, module, and or sensor.
7. Loose, dirty, or corroded ignition module connector at crankcase.
8. Faulty CKP or CMP, MAP, ETS, ATS, TPS, O2 sensor.
9. Dirty air filter.
10. Intake air leak.
11. Water, dirt, or rust in the fuel system.
12. Carburetor contaminated, sticky float, plugged jets.
13. Carburetor vacuum diaphragm torn, cracked, not seated or installed improperly.
14. Multiple carburetors out of sync.
15. Fuel filter clogged.
16. Old or contaminated fuel.
17. Fuel tank vent system plugged or carb vent line closed off.
18. Gas cap diaphragm valve faulty.
19. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
20. Carburetor controls misadjusted.
21. Incorrect valve timing.
22. Valve springs floating, weak, or broken.
23. Damaged intake or exhaust valve.
24. Incompatible performance parts.
25. Control module may be in "LIMP" mode
26. Check for engine trouble codes.
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.
crf450r Misfire totally stumped
https://crfsonly.com/forum/viewtopic.php?t=23140
Honda CRF450X 2005 Service Manual
http://www.partsfish.com/page/oem-parts-for-honda
Honda CRF450R Owner Manual

Posted on Oct 19, 2017

Ad

6 Suggested Answers

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

Ad
robotek
  • 1512 Answers

SOURCE: CRF 450 IS LEAKING OIL TROUGH CARBURETOR

Hi there

You should not have oil leaking from the carby. If you have over filled it with oil, then it may be coming from the crankcase breather and then into the airbox, and appearing to come from the carby. If you have not over filled it, then the bike may have blowby problems with compression gasses passing the rings, and in a similar manner forcing oil out the crankcase breather. Not sure about the hole in the side of the cylinder... do you have a picture? Unless its pouring out, or gets worse, I would not be too worried. If you have over filled the oil, maybe time for an oil change to get the level right.

regards
robotek

Posted on Dec 06, 2008

  • 2 Answers

SOURCE: CRF 450 Honda leaking oil through carburetor

it sounds like your valve/rocker cover to spark plug tube seal is folded over or something. My reason for saying this is, because the only place for oil to get into the plug tube is a bad seal to the cover or the spark plug isn't tight? and that hole is for expelling liquid so it doesn't cook the plug into the head

Posted on Feb 19, 2009

  • 3567 Answers

SOURCE: cant tighting the cam chain no more 2003 honda 450 r

Have the dealer replace the worn chain. On this new of a bike I think the chain may be okay. Ask the dealer if you are adjusting the chain properly.

Posted on Mar 12, 2009

  • 3567 Answers

SOURCE: Valve Adjustment for 2003 Honda CRF 450 R

This should help.
851c7e5.png
Please rate this answer, thanks.

Posted on Jul 25, 2009

  • 8909 Answers

SOURCE: Engine misfires at high rpm

Depending on how high the revs are, it is either valve bounce or an ignition fault. Check the plug type and gaps and check the engine mapping.

Posted on Jan 03, 2011

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

2003 Crf 450r ICM CONNECTOR wiring schematic


Hi, Barry for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Honda, despair not, for a mere $8 you can download another one. 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.
CRF450R service manual repair 2002 2004 CRF450 Download Manuals Technical
http://www.partsfish.com/page/oem-parts-for-honda
Honda CRF450R Owner Manual
Honda CRF 450 R2 R3 02 03

Aug 07, 2016 | Motorcycles

1 Answer

2006 honda crf 450x oil and transmission change


Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one. 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.
Honda CRF450 Transmission side oil change
How to Change the Oil Honda CRF450
Honda CRF450X 2005 Service Manual
http://www.partsfish.com/page/oem-parts-for-honda
Honda CRF450R Owner Manual

Feb 21, 2013 | 2006 Honda CRF 450 R

1 Answer

On my 2004 CRF 450, I have oil leaking out of my rear shock. What do I do to fix it?


Hi, Anonymous for more information about your question and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Leaking rear shock seal
CRF Rear SHOCK Rebuild SHOWA Shock from CRF450
Honda CRF450X 2005 Service Manual
http://www.partsfish.com/page/oem-parts-for-honda
Honda CRF450R Owner Manual

Jul 04, 2012 | 2004 Honda CRF 450 R

1 Answer

2008 Honda CRF 450 R remove the front sprocket


Hi, Kevinedwa376 for this scenario you will need your service/owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one. 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.
16t front sprocket on CRF450
How to take off CRF450 front sprocket
Honda CRF450X 2005 Service Manual
http://www.partsfish.com/page/oem-parts-for-honda
Honda CRF450R Owner Manual

Jul 12, 2011 | 2008 Honda CRF 450 R

1 Answer

How many mls of oil do i put in my 2005 crf 450 r engine?


Hi, Jimbobscott for this scenario you will need your service/owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one. 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.
06 CRF 450 oil capacity
Oil Recommendation CRF450 CRF250
Honda CRF450X 2005 Service Manual
http://www.partsfish.com/page/oem-parts-for-honda
Honda CRF450R Owner Manual

Dec 04, 2010 | 2005 Honda CRF 450 R

1 Answer

2004 CRF 450 how to change the oil


Hi, Option0816 for this scenario you will need your service/owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one. 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.
How to Change the Oil Honda CRF450
Honda CRF450 Transmission side oil change
Honda CRF450X 2005 Service Manual
http://www.partsfish.com/page/oem-parts-for-honda
http://www.partsfish.com/page/oem-parts-for-honda
Honda CRF450R Owner Manual

Jul 16, 2010 | 2004 Honda CRF 450 R

1 Answer

2003 Honda CRF 450 R gear oil capacity


Hi, Brandonhowar for this scenario you will need your service/owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one. 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.
Need oil change procedure for an 03 CRF450
Honda CRF450 Transmission side oil change
Honda CRF450X 2005 Service Manual
http://www.partsfish.com/page/oem-parts-for-honda
Honda CRF450R Owner Manual

May 13, 2010 | 2003 Honda CRF 450 R

1 Answer

2004 Honda CRF 450 R water pump leaks


Hi, Lanepitts48 for this scenario you will need your service/owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one. 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.
crf450 leaking from weep hole coolant
Dirt Bike 04 08 crf450 Leaking Water Pump Rebuild
Honda CRF450X 2005 Service Manual
http://www.partsfish.com/page/oem-parts-for-honda
Honda CRF450R Owner Manual

May 09, 2010 | 2004 Honda CRF 450 R

1 Answer

04 crf450.hard start when cold(25deg).kick for 10min.once it


1. First thing is when was the last time you had your valves adjusted
2. On cold start up twist about 15 times on your throttle, as you do that the accelerator pump in carb will shot gas in cylinder, I have a 2003 yx426 & 2005 yz450 have to do to both of them when cold out to get started





Feb 07, 2010 | 2005 Honda CRF 450 R

Not finding what you are looking for?
2003 Honda CRF 450 R Logo

Related Topics:

34 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

76691 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...