HuDuVuDu
Post Posted: Sun Feb 10, 2008 12:27 pm
 Subject: Throttle sticking

I just picked up a 2001 250. it has some minor issues. The throttle does not return to closed when you release it. You have to close the throttle manually.

what should I check first.


Thanks.
BrianM
Post Posted: Sun Feb 10, 2008 12:39 pm
 Subject: Re: Throttle sticking

Lube the cable and check that the grip isn't rubbing on either the switchgear housing or the bar end.

You *might* need to remove the throttle tube and remove crud from the bar (I've had a fw used bike that looked like they had bubble-gum under the throttle tube, on the bar).

Brian
Leon
Post Posted: Sun Feb 10, 2008 1:29 pm
 Subject: Re: Throttle sticking

HuDuVuDu wrote:

what should I check first. Thanks.


I hate to have to play the part of the admin, but this one is just too easy. The official board answer is (all together now)

Check the FAQ first.

What BrianM said, plus make sure there is just a bit of slack in the throttle cables. At the carb end, you chould be able to wiggle the longer of the two cables that can be seen about 1/4 inch sideways. Think of it like checking the slack in your drive chain, if the throttle cables are too tight they will bind and not move easily. Adjustment is done with the two 10MM nuts on the carb ends of the throttle cable housings.
HuDuVuDu
Post Posted: Sun Feb 10, 2008 1:40 pm
 Subject: Re: Throttle sticking

Leon wrote:
HuDuVuDu wrote:

what should I check first. Thanks.


I hate to have to play the part of the admin, but this one is just too easy. The official board answer is (all together now)

Check the FAQ first.


I did check the FAQ, and I did not see anything about sticking throttle. If there is something in the FAQ about sticking throttle, can you point it out to me?
dizeldawg
Post Posted: Sun Feb 10, 2008 1:50 pm
 Subject: Re: Throttle sticking

http://faq.ninja250.org/wiki/Adjusting_the_throttle_cables

Took me all of three seconds to find this.......
Leon
Post Posted: Sun Feb 10, 2008 2:03 pm
 Subject: FAQ - Cables and Controls, Adjusting the throttle tables.

"Adjusting the throttle cables"
From Ninja250Wiki
"The adjustment for the throttle cables is visible and accessible on the right side of the right carburetor. You can easily see how it works and adjust it with a suitable wrench (probably one of those in your tool kit.)

"Your throttle cable needs a little slack in it to keep from being pulled when the bars are turned. This adjustment has important safety implications. You want your engine to be able to return to idle.

"Under normal conditions one can feel the little bit of slack in the cable that must be there, maybe 1/8" when you turn the twistgrip with the engine not running"

I apologize for sounding like a smart-ass. Those of us who have been here for a very long time recognize the questions that appear frequently. Those are usually in the FAQ, but I agree they can be hard to find.
HuDuVuDu
Post Posted: Sun Feb 10, 2008 2:38 pm
 Subject: Re: Throttle sticking

the cables seem to be ok. there is a little bit of slack. what happens is once you pull the throttle then remove you hand it says right were it is. it is like cruse control.
dom
Post Posted: Sun Feb 10, 2008 7:51 pm
 Subject: Re: Throttle sticking

If the cable is not binding due to a lack of slack check elsewhere. Lube first and then check for kinks in the cable. You have to take the gas tank off for this, but do not remove the cable if it looks like it is in a good position. You risk introducing a kink or reducing the freedom of motion at the handle bars.

You could also check to see if it's binding inside the handlebar housing. This is held togethor with a couple of screws but can be finicky to reassemble.

I'm not 100% sure but I believe the carbs have a throttle return spring. If this spring is broken the throttle would stick like you are experiencing. I would think to test for this you would have to remove the cable from the carb and then turn the throttle on the carb by hand to see if it springs back. This would also allow you to see if the inner cable is binding in it's housing due to fraying from wear. Pull on either ends, the cable should move freely.

Hope this helps out, all the possibilities I could think of.
Nish
Post Posted: Mon Feb 11, 2008 8:10 pm
 Subject: Lubricate the throttle housing.

After installing some lowered risers a few weeks a ago, I was having some minor throttle sticking issues as well.

The cables were thoroughly lubed, it had the correct amount of slack, there were no kinks in the cables that I could find and there was nothing obviously wrong in the housing. So I just packed the housing with grease anywhere 2 things might rub together and greased the inside of the throttle tube (this would require removing the bar end with the stock bars), and the problem disappeared.

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