KDX not revving all the way through RPM range

Discussion specific to the 1995 - 2006 KDX200 (H Series) and 1995 - 2005 KDX220R (A Series) models sold in the USA
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bergilong
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KDX not revving all the way through RPM range

Post by bergilong »

My KDX is only revving about halfway through the RPM range when I first start riding. After a few minutes of riding, it will revv all the way. Could this be a carb issue, power valve issue, or something else? Thanks.

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diymirage
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Re: KDX not revving all the way through RPM range

Post by diymirage »

sounds to me like sticky power valves
newbbewb wrote:DIYmirage has it right.


-1996 KDX 200 woods weapon (converted to 99 green body)
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-2003 Yamaha TTR125-L (wifeys bike)
-1997 KDX 220 project bike
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Re: KDX not revving all the way through RPM range

Post by KDXGarage »

What have you already checked and eliminated as possible causes?
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Tyl3r
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Re: KDX not revving all the way through RPM range

Post by Tyl3r »

diymirage wrote:sounds to me like sticky power valves
x2 especially if it runs a little better after it gets warm.
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bergilong
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Re: KDX not revving all the way through RPM range

Post by bergilong »

Okay. I'll pull it apart and look at it. Would it be sticky because it's dirty or for another reason?
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Tyl3r
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Re: KDX not revving all the way through RPM range

Post by Tyl3r »

They just gunk up over time and need cleaned periodically. Too much premix will make them gunk up faster.
04/05 KX220 Hybrid all decked out
18 KTM 500 EXC-F Dual Sport/Sumo toy
24 KTM 300XC-W Cheater bike
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