Does "dry" cables affect hanging RPMs?

[Albrekt]

Hello!

So I was out riding at the track, and a guy told me that I should probably lubricate my cables - and that it might be the cause of the hanging RPMs.

 

So my bike has been sitting still for 1 year, with no cable lubrication or cleaning.

 

Is this probably the reason for hanging RPMs? And does a well lubricated cable really do that much?

 

Thank you! :-)

 

By the way, im very new to motocross, so I might be a bit of a noob.

Edited October 15, 2017 by Albrekt

[MXT]

Dry/sticking cables CAN be an issue that could cause hanging idles, but this is most likely not the case. 

Do you have a carbureted bike or a fuel injected bike? If it's carbureted I would check your fuel screw/clean the carb (especially if it's been sitting for a year). Gas tends to gunk up and clog your pilot jet which will cause the bike to run lean on the low end (hence the high idle). Are you getting popping on deceleration?

[Albrekt]

I have a 2016 KX250F, and it is fuel injected.

[MXT]

Interesting, is there any feeling of stiction when you move the throttle?

Do you have any free play in your throttle tube? 

[FaceDeAce]

The answer to the question is : Yes
If the throttle is sticky at all, yes. It should rotate smooth and if you let go it should snap to the zero position. If it is slow to return or sticks anywhere, yes it will cause such.

[Albrekt]

The throttle is snappy, goes straight back to starting point.

[FaceDeAce]

The throttle is snappy, goes straight back to starting point.

Then you need to be looking for some other cause.

[Albrekt]

1 hour ago, FaceDeAce said:

 

Then you need to be looking for some other cause.
 

 

Do you have a clue what it could be then? It's a fuel injected 2016 KX250F

[Haney126]

One thing that comes to my mind is an air leak, when the engine is sucking air in from another source like a small hole or tear in your intake track in front of your throttle body etc

this can cause a hanging idle as well, I'm no pro but it may be a good idea to check out

[notoriousE-R-I-C]

Glad someone finally said air leak. Spray starter fluid around while its running. When rpms rise you found your leak in the last spot you sprayed. Maybe just a finger smudge of silicone. Maybe a new manifold.
For your cables. Get a syringe. Squirt some gas through em. Then squirt some oil through em. Done

[kxjim]

i have a 2015, mine hangs or rises in gear, when i shift to neutral, and let out the clutch it goes back to normal. shift into gear it rises back up... i got over the mental side of it real quick, although i dont know what causes it, it runs like a BEAST. 

[FaceDeAce]

1 hour ago, kxjim said:

i have a 2015, mine hangs or rises in gear, when i shift to neutral, and let out the clutch it goes back to normal. shift into gear it rises back up... i got over the mental side of it real quick, although i dont know what causes it, it runs like a BEAST. 

This is normal.  This is built into the CDI module.

[stronius445]

You have an idle screw on all kx250fs that are fuel injected. turn down your idle... Simple.