Question about 2005 Honda CRF 450 R

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2005 crf450 keeps getting vapor locked

Riding out in the woods than died and would not kick. took plug out and air came out than could kick it over

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Hi, Anonymous and the usual suspects are:
1. Fuel boiling in fuel line due to extremely high outside temperatures and unprotected fuel lines missing convoluted tubing cover routed too close to cylinders and or heads.
2. The gas cap is not venting properly.
3. Fuel tank vent line blocked, plugged, kinked, or smashed.
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.
2004 CRF450 Dies after 5 mins Riding
http://www.dezertrangers.com/vb/archive/index.php/t-22132.html
Honda CRF450X 2005 Service Manual
http://www.partsfish.com/page/oem-parts-for-honda

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

Posted on Jun 26, 2017

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Posted on Jan 02, 2017

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wayneman01

Wayne Thomas

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SOURCE: 2005 honda crf450 cant get the idle right & is

Bigger jetting (a higher fuel/air ratio) will not cause overheating. But an air leak between the engine and carburetor can cause overheating - and an erratic idle. Make sure the carb is correctly connected and there are no air leaks. An air leak could also be the cause of the popping that you were attempting to address by re-jetting.
Once any air leaks are corrected, adjust the idle mixture screw to attain the highest idle speed when the engine is at normal operating temperature. Then, use the idle speed screw to set the correct idle speed.
Finally, ride the bike at full throttle for a short time, pull the clutch and coast to a stop. Remove the spark plug and check the color; a tan or light brown color indicates correct jetting. Too light = too lean. Too dark = too rich.

Posted on Nov 01, 2009

Anonymous

  • 1 Answer

SOURCE: 03 CRF450 R push starts and runs, will not kick start.

i have real bad trbl tryin 2 start my crf450 cold or hot it jus doesnt seem 2 want 2 go, any ideas??

Posted on Jan 19, 2010

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Sounds like the gas tank isn't venting.

If air isn't allowed to enter the gas tank to replace the gas flowing out, vapor lock happens.

Next time it dies, remove gas cap and see if it starts quicker/easier, and runs longer.

If so, then you have a plugged vent.

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They can s uck water into the carb through the overflow tubes, so try draining the carb bowl.
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Jun 27, 2010 | 2005 Honda CRF 450 R

1 Answer

2005 honda crf450 cant get the idle right & is


Bigger jetting (a higher fuel/air ratio) will not cause overheating. But an air leak between the engine and carburetor can cause overheating - and an erratic idle. Make sure the carb is correctly connected and there are no air leaks. An air leak could also be the cause of the popping that you were attempting to address by re-jetting.
Once any air leaks are corrected, adjust the idle mixture screw to attain the highest idle speed when the engine is at normal operating temperature. Then, use the idle speed screw to set the correct idle speed.
Finally, ride the bike at full throttle for a short time, pull the clutch and coast to a stop. Remove the spark plug and check the color; a tan or light brown color indicates correct jetting. Too light = too lean. Too dark = too rich.

Nov 01, 2009 | 2005 Honda CRF 450 R

2 Answers

What is a Vapor Lock? How to fix it?


Google " vapor lock " and read the wikipedia definition. Your problem could be vapor lock but I think it is a vacuum problem. If no air can get into the gas tank then fuel can't get out. Most gas caps have a vent aspect built into the cap. Ride your bike with the cap loose. If the problem disappears you now know the source.

Can I get a “very helpful” rating on this answer?

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Maintenance Yamaha


I use mine for woods riding, i change the oil every 5th ride. I know that i could go for a whole bunch longer. clean your air filter at the same time a long with your spark plug. if you keep this up you will have this bike for a long time.

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