Question about 2004 KTM EXC 450 Racing

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04 exc 450 wont rev

Bike idles great, but as soon as you give it gas it boggs out and dies. valves have been adjusted carb jets have been pulled and cleaned, air filter is clean vent cap for gas cap is unobstructed. I cant figure out why it wont rev. Thanks

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Pull the slide and move the jet needle clip down 1 or 2 notches.

Posted on Apr 21, 2009

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04 honda 500 rubicon starts good and sounds smooth at idle but boggs down when you push throttle. new gas, cleaned carb. replaced parts carb. kit also chekd TCS any ideas need help thanks R.H.


Hi, Anonymous and the usual suspects are:
1. Throttle cables misaligned or misrouted.
2. Damaged or restricted fuel tank venting system.
3. Inlet system air leak.
4. Vacuum piston malfunction.
5. Accelerator pump leaking or no output.
6. Plugged bowl vent.
7. Fuel level in bowl too low.
8. Restricted fuel supply passages.
9. Plugged jets or passages.
10. Worn or damaged needle or needle jet.
12. The enricher valve not seated or leaking.
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.
http://www.hondaforeman.com/128-foreman-450/74303-carb-driving-me-crazy.html
http://www.hondaforeman.com/149-honda-recon/69272-2005-recon-will-not-accelerate.html
Honda 450 Foreman backfiring no power but idles fine
Bogging out when give my four wheeler gas
http://www.hondampe.com.au/docs/owning_a_honda/owners_manuals/motorcycles/TRX500FA-FOURTRAX%20FOREMAN%20RUBICON-2003.pdf
http://ng-products.com/nic/honda/2007%20Honda%20Foreman%20Rubicon%20Service%20Manual.pdf

Apr 20, 2016 | Honda Motorcycles

1 Answer

HELP !!! I have a Yamaha VStar 650 that will Idle but as soon as I give it a little gas it dies.


Probably you did not need to replace those, are both cylinders running?
was the motorcycle sitting for any length of time?
make sure the carb low speed jets are clear use carb cleaner the can with the with the tube and make sure the low speed jet will flow the fuid through it. if its clogged take a strand of copper wire and clear them.

Oct 26, 2012 | 2006 Yamaha V Star Classic

1 Answer

My yfz 450 yamaha 4 wheeler runs great in 1/2 choke, but when i put it down to idle it starts to miss and dies, I have replaced all of the carb and I am getting ready to asemble everything, the one thing I...


start about 2 turns out.
while idling when you screw it in a bout half a turn the bike will begin to bog down (rich)
as you screw it out the revs will increase and become uneven(lean)
pick a point between the two where the idle is smoothest.
this setting can change with different engine tempuratures, and altitude

Dec 17, 2010 | 2004 Yamaha YZ 450 F

2 Answers

I let my bike sit for asbout 3 years and now it wont stay on


The pilot jets are still gummed up. This jet controls the idle port and usually gets overlooked. To clean it the jet must be removed along and the adjusting screw as well. The circuit must be cleared of gum. For each individual carb, when removing the jet and the adjuster, count the turns then remount that number of turns. Now turn the adjuster screw 1/4 turn counter clockwise.

Jun 11, 2009 | 1997 Suzuki GSX 600 F (Katana)

4 Answers

Wont start by kick start but will by pull start


sounds like your idle jet is clogged, remove your carb and clean idle jet cause it won't idle or kick start without it...good luck to you friend...Tim

Jun 05, 2009 | 2003 kawasaki KX 125

1 Answer

2005 yamaha yzf 250-unstable idle


I had the same problem, Turns out that my shims were finished, replace the chims and check clearences.

Mar 12, 2009 | 2004 Yamaha YZ 450 F

1 Answer

Wont run /idle


i'd start with removing the carbs and giving them a thorough cleaning as when bikes sit for so long, the carbs begin to get gummy/varnished from the old gas.

check for blocked holes in the pilot jet & main jet and look for "hard & dried up" gas in passages. be careful of the float bowl gasket as to not tear it or you will need a replacement.

Mar 03, 2009 | 1999 kawasaki ZR-7

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