Question about 2005 Suzuki GSX 400 Impulse

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Why does my 4 wheeler die when I let off the gas?

I have turned the idle up and it will stay running when idling but when I am riding and let off the gas it dies right away.

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First thing i would look at is carb balance,these bikes are quite critical on balance,if the carbs are not balanced correctly it will do exactly as you describe,get hold of a set of vacuum gauges or take it to a good bike shop,they will have them,it is not expensive to get them done,but it will be if you dont,it is quite possible you will lean out one or two cylinders and melt a piston or something more sinister

Posted on Jul 03, 2009

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Posted on Jan 02, 2017

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Hi Johnny, Im AL the owner of Big As Auto Repair.

Johnny, here's something I want you to try. I want you to start the engine while giving it a little gas, not much, just enough to see if it will idle. If it does Idle and stays running with your foot on the gas and dies when you remove your foot. Then go and buy an 'IDLE AIR CONTROL MOTOR" It mounts on the throttle body. Put that on, there are only two screws that holds it on, very easy to replace. After installing it the idle will be real high, this is normal, just wait it will stabilize and idle normal. NOTE: if it still dies even with your foot on the gas, then you have another issue but this is a good place to start. Hope this helps and please visit my auto-repair-website at: http://www.bigasautorepair.com/

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