High Idle - Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums
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post #1 of 7 (permalink) Old 04-19-2009, 11:03 PM Thread Starter
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Needing some help here as I am out of ideas. I have a 2006 YFZ 450. I am having issues with a high idle once the quad gets up to normal operating temp. It doesn't stay at a high idle just hangs there for a couple seconds after hitting the gas then drops off to normal. I have cleaned out the slide, changed the gasket on the slide. Checked the jets out to make sure all clean. Checked the throttle cable and the routing for the cable, it isn't getting pinched anywhere. It acts normal when cold, just starts this once it gets warmed up. Makes me think it has something going on in the carb that temp would be affecting it but not sure. Any help would be appreciated.

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post #2 of 7 (permalink) Old 04-19-2009, 11:19 PM
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could be a leak around the carb boot, try turning the bars to see if it does it then could need adjustment
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post #3 of 7 (permalink) Old 04-19-2009, 11:24 PM
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It could also be your a/f screw. How many turns do you have it out?

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post #4 of 7 (permalink) Old 04-19-2009, 11:32 PM
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I'm with Woody <---- that sounds nice.....

Seems like an air leak somewhere.

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post #5 of 7 (permalink) Old 04-19-2009, 11:35 PM
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QUOTE (Defiant @ Apr 19 2009, 08:32 PM)
Quote:
I'm with Woody <---- that sounds nice.....

Seems like an air leak somewhere.[/b]
does sound good haha,

spray some soap water around the carb boot and see if you can see some leakage

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post #6 of 7 (permalink) Old 04-20-2009, 12:31 AM
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QUOTE (woody0388 @ Apr 19 2009, 08:35 PM)
Quote:
does sound good haha,

spray some soap water around the carb boot and see if you can see some leakage[/b]


I would try spraying starting fluid or carb cleaner around the carb boots and see if the idling changes while running. if it changes you deffinetly have an air leak.

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post #7 of 7 (permalink) Old 05-11-2009, 10:05 PM Thread Starter
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Well figured out the problem. Turns out the A/F screw needed some adjustment, I was running it a bit lean. Thanks for the help.

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