Throttle butterfly? Throttle doesn't snap back

CosmosUnchained · September 16th, 2015, 11:00 AM

I put my bike (2009 250R) down on the right side yesterday during a turn on gravel. I'm still a rookie, rookie mistake, but luckily I'm perfectly fine.
After standing it up, it wouldn't start right away, but my friend soon realized that was because the throttle was fully open. After poking something back into place where the throttle butterfly is, I was able to ride it back home by manually opening and closing the throttle, the snap action is gone. As I neared the final stretch, I couldn't close the throttle any longer.
Something is clearly wrong and/or I'm missing a part. Any help?

Can someone please take a video/pictures of this section of their bike so I know what it's supposed to look like?
Here's mine, unstarted.

csmith12 · September 16th, 2015, 11:06 AM

Bummer Steve, but glad you're fine.

It's one of 4 possible things.

The throttle tube parts are binding and need to be resorted.
The throttle grip is binding and not allowing a snap back
The throttle cable is binding somewhere in the routing.
The throttle tube exit point is broken and needs replaced (I am not explaining this very well, I will get you a pic in a bit)

No matter the cause, it should be an easy fix.

dcj13 · September 16th, 2015, 11:16 AM

Steve, are you missing a screw that holds the bracket for the end of the cable to the carburetor?

CosmosUnchained · September 16th, 2015, 11:23 AM

I think so. There's that clear hole and it looks like it takes a screw, but I haven't a clue what it's supposed to look like so I haven't done/bought anything

dcj13 · September 16th, 2015, 11:55 AM

I mentioned it because that bracket was wiggling all over the place when you were operating the throttle. The ends of the outer cables are supposed to be fixed with respect to the carburetor. I think you are missing on or more screws.

Figure out how that bracket attaches to the carb and replace the screw(s).

dcj13 · September 16th, 2015, 11:58 AM

I just watched your video again: I can see the boss with the threaded internal hole that the screw goes into and a smaller boss that the slot in the bracket is supposed to mate up with.

You're missing a fifty cent screw and washer!

CosmosUnchained · September 16th, 2015, 12:06 PM

No springs or anything besides that?
That'd make my day

dcj13 · September 16th, 2015, 12:09 PM

Your spring is visible in the video. It is behind the bellcrank for the throttle shaft.

CosmosUnchained · September 17th, 2015, 03:25 PM

Just an update: one simple screw was all it took.
A sincere thanks to you both! I'm back to riding

dcj13 · September 17th, 2015, 04:56 PM

So glad to hear it! Your video made the remote diagnosis possible: Good work on your part!

September 16th, 2015, 11:00 AM	#1
CosmosUnchained ninjette.org newbie Name: Steve Location: Columbus, MS Join Date: Aug 2015 Motorcycle(s): 2009 Ninja 250R Posts: 6	Throttle butterfly? Throttle doesn't snap back I put my bike (2009 250R) down on the right side yesterday during a turn on gravel. I'm still a rookie, rookie mistake, but luckily I'm perfectly fine. After standing it up, it wouldn't start right away, but my friend soon realized that was because the throttle was fully open. After poking something back into place where the throttle butterfly is, I was able to ride it back home by manually opening and closing the throttle, the snap action is gone. As I neared the final stretch, I couldn't close the throttle any longer. Something is clearly wrong and/or I'm missing a part. Any help? Can someone please take a video/pictures of this section of their bike so I know what it's supposed to look like? Here's mine, unstarted.

September 16th, 2015, 11:06 AM	#2
csmith12 The Corner Whisperer Name: Chris (aka Reactor) Location: Northern KY Join Date: May 2011 Motorcycle(s): 2010 250 (track), 1992 250, 2006 R6 (street/track), 2008 R6 (track) Posts: Too much. MOTY 2015, MOTM - Nov '12, Nov '13	Bummer Steve, but glad you're fine. It's one of 4 possible things. The throttle tube parts are binding and need to be resorted. The throttle grip is binding and not allowing a snap back The throttle cable is binding somewhere in the routing. The throttle tube exit point is broken and needs replaced (I am not explaining this very well, I will get you a pic in a bit) No matter the cause, it should be an easy fix. __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

September 16th, 2015, 11:58 AM	#6
dcj13 Participant Name: Dave Location: South of Seattle Join Date: Oct 2012 Motorcycle(s): '94 K75 std Posts: Too much. MOTM - Aug '15	I just watched your video again: I can see the boss with the threaded internal hole that the screw goes into and a smaller boss that the slot in the bracket is supposed to mate up with. You're missing a fifty cent screw and washer!
	1 out of 1 members found this post helpful.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Full throttle kills bike, throttle lag response.	Diegone	2008 - 2012 Ninja 250R Tech Talk	10	April 30th, 2014 03:25 AM
Throttle doesn't "snap back"	AGFE0914	2008 - 2012 Ninja 250R Tech Talk	21	April 15th, 2013 08:54 PM
[twisted throttle] - Visit the Twisted Throttle Open House & 10th Anniversary Party o	Ninjette Newsbot	Motorcycling News	0	April 13th, 2012 08:00 AM
[twisted throttle] - Visit the Twisted Throttle Open House & 10th Anniversary Party o	Ninjette Newsbot	Motorcycling News	0	April 13th, 2012 07:40 AM
Throttle & Throttle Cable Smoothness	paterick4o8	2008 - 2012 Ninja 250R Tech Talk	3	December 1st, 2009 01:50 PM

September 16th, 2015, 11:16 AM	#3
dcj13 Participant Name: Dave Location: South of Seattle Join Date: Oct 2012 Motorcycle(s): '94 K75 std Posts: Too much. MOTM - Aug '15	Steve, are you missing a screw that holds the bracket for the end of the cable to the carburetor?

September 16th, 2015, 11:23 AM	#4
CosmosUnchained ninjette.org newbie Name: Steve Location: Columbus, MS Join Date: Aug 2015 Motorcycle(s): 2009 Ninja 250R Posts: 6	I think so. There's that clear hole and it looks like it takes a screw, but I haven't a clue what it's supposed to look like so I haven't done/bought anything

September 16th, 2015, 11:55 AM	#5
dcj13 Participant Name: Dave Location: South of Seattle Join Date: Oct 2012 Motorcycle(s): '94 K75 std Posts: Too much. MOTM - Aug '15	I mentioned it because that bracket was wiggling all over the place when you were operating the throttle. The ends of the outer cables are supposed to be fixed with respect to the carburetor. I think you are missing on or more screws. Figure out how that bracket attaches to the carb and replace the screw(s).

September 16th, 2015, 12:06 PM	#7
CosmosUnchained ninjette.org newbie Name: Steve Location: Columbus, MS Join Date: Aug 2015 Motorcycle(s): 2009 Ninja 250R Posts: 6	No springs or anything besides that? That'd make my day

September 16th, 2015, 12:09 PM	#8
dcj13 Participant Name: Dave Location: South of Seattle Join Date: Oct 2012 Motorcycle(s): '94 K75 std Posts: Too much. MOTM - Aug '15	Your spring is visible in the video. It is behind the bellcrank for the throttle shaft.

September 17th, 2015, 03:25 PM	#9
CosmosUnchained ninjette.org newbie Name: Steve Location: Columbus, MS Join Date: Aug 2015 Motorcycle(s): 2009 Ninja 250R Posts: 6	Just an update: one simple screw was all it took. A sincere thanks to you both! I'm back to riding

September 17th, 2015, 04:56 PM	#10
dcj13 Participant Name: Dave Location: South of Seattle Join Date: Oct 2012 Motorcycle(s): '94 K75 std Posts: Too much. MOTM - Aug '15	So glad to hear it! Your video made the remote diagnosis possible: Good work on your part!