Question about 2004 Yamaha FZ6

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Engine cutting out with the choke off

I have a 2006 yamaha yzf450 and the engine cuts out while the choke is off. but when i turn the choke on it runs good but the idle is high even after the engine warms up. i replaced the spark plug but it continues to react the same way.

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  • Daniel Grimm May 11, 2010

    has it been jetted? does it have aftermarket exhaust? does it have motor work done to it?

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Seriously? it's fuel injected, do some research before trying to give an answer....

Posted on Jan 17, 2009

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The first thing is the carb clean?
a dirty carb will do this
do you have a vacuume leak?
could be carb boot.
also if the valves are not adjusted right it will act tha same way.

Posted on Dec 02, 2008

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johnnygixxer
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SOURCE: engine cutting out with the choke off

Adjust your idle screw on your carb so that it gets more gas just sitting there at idle. Tighten the screw one and a quarter turn and then start the bike. Adjust the idle to where you think it sounds normal. If that doesnt work check your float in your float bowl, it might be stuck in the down position. Clean with some carb cleaner spray and make sure it moves freely before putting the float bowl back on, youll have to choke it or prime the carb again to get it started. All the choke does is let in more gas and oxegen so you might want to check how far the carbs close when you push the choke back in. Is it impeading any normal carb setting. Check that too. Good luck.

Posted on Dec 02, 2008

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What is the standard air mixture setting ? and the needle position ? Yamaha ttr250 2004 bike runs on choke but when you turn it off bike cuts out like it runs out of fuel


Hi, You have a closed mainjet (need cleaning) as for idling you must screw in all the way and then unscrew 2 turns (that's a standart) and then you only have to do minor adjustments.
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Will not start.


If it runs only with choke it means that the mixture is rich.The idle and main jets are thoroughly cleaned?The flow pin has a rubber nose.Is it soft? If it is hard like wood it does not cut of the gas completely and it overflows the engine with extra gas.The height of the floats, that controls the pin, is parallel to the carburetor's surface?

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Backfire after shutoff


With the key off and the engine "running down", the idle circuit fuel is still going to into each cylinder then out the exhaust. A hot spot in the exhaust can ignite the unburned fuel creating an explosion, ( backfire ). Let the engine run down to an idle THEN turn the key off.

Please rate this answer. Thanks!

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2003 yzf450 wont run right?


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Jan 02, 2009 | 2003 Yamaha YZ 450 F

2 Answers

Engine cutting out with the choke off


Adjust your idle screw on your carb so that it gets more gas just sitting there at idle. Tighten the screw one and a quarter turn and then start the bike. Adjust the idle to where you think it sounds normal. If that doesnt work check your float in your float bowl, it might be stuck in the down position. Clean with some carb cleaner spray and make sure it moves freely before putting the float bowl back on, youll have to choke it or prime the carb again to get it started. All the choke does is let in more gas and oxegen so you might want to check how far the carbs close when you push the choke back in. Is it impeading any normal carb setting. Check that too. Good luck.

Dec 01, 2008 | 2004 Yamaha YZ 450 F

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