Question about 2007 ATK 450 Mx

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Slow deceleration in neutral

Any of you atk 450 owners experience a slow return to idle when you chop throttle (in neutral)? Just sitting there revving the engine does this

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Pull carb and make sure jets are CLEAN the slightest debris can cause hanging rpms I removed and cleaned carb twice before I actually got it right on suzuki

Posted on Aug 28, 2013

  • gotta clean it Aug 28, 2013


    Hanging rpms? Pull carb and do a thorough clean be certain jets are free of debris It took me three times but mine finally was right after cleaning. Dealer told me when I was going to purchase new carb

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It revs fine but then backs down to idle slowly. Cdsracer mentioned that his cousin's in SoCal also does this.... Is it due to the different dirtbike clutch basket size? Any idears? Something simple maybe?Mine both drop right back down. Sometimes a slight hover at 2200 RPM or so then settles at 2000 RPM (usually only before motor has fully warmed up) ,,,

Posted on Nov 10, 2008

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Hi, Ron and the usual suspects are:
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Hi, Steve and the usual suspects are:
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5. Intake system air leak.
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Hi Chansen685, I am sorry you can't find the first and best tool you ever bought for your ATK but despair not for a mere $0 you can download another one. For more information about your issue, please visit the websites below. Good luck and have a nice day.
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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.
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2 Answers

I have an 07 yz450f i need to know how to adjust the carb. i am not sure what screws do what and where the are even located on the carb. the bike has less than 15 hours and is all stock. it pops on...


the screws on the carb are for idle speed , and air mixture, the air mixture it underneath,but it really only affects mixture at idle speed.
you may need to try raising the slide needle, or go up a size in the main jet, do one at a time and keep notes about the changes and results

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1 Answer

Bike isnt starting and if it starts turns off soon after, also electric starter isnt turning the bike on (brand new bike)


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After complete dissassembly and cleaning of


Try taking the return spring out and give it about an additional one inch of length by gently stretching it out. Over time, the spring can loose some of its original tension.
Even the smallest debris particle can cause the throttle slide to hang up. If it isn't foreign matter causing it to stick, then there could be a ding or gouge in either the slide or the carburetor body. Take the slide out and put some blue machinists dye on it, then slide it up and down inside the carb - this will show you where any high spots are. Carefully remove the high spots with 1,500 grit wet or dry sandpaper.

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1 Answer

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clutch cable needs adjusting its still engaging whilst when you stop by sounds get back to me if its wrong i have other optons

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