2007 SV650 Stuck throttle

[Babba_gee]

I crashed my 2007 SV650 at Thunderhill last year, after sitting for a year I finally decided to get around to fixing it. During the crash, the throttle tube/throttle cables and ignition assembly got damaged. I purchased a new ignition assembly along with new throttle cables, after installation, I tested out the throttle response and noticed that it does not snap shut like before. It takes a while for it to close, even opening the throttle takes some effort.

I ended up removing all the cables to test if the throttle bodies would open and shut quickly at the throttle body but had similar results. I ended up cleaning the area surrounding the throttle body with wd40 and then added some 3 in 1 oil to see if that would help. It still has a sluggish response.

I've searched everywhere and haven't found a solution. Would anyone know what might be the problem? I haven't started the bike in over a year, would starting it help maybe loosen up the throttle body assembly through some heat?

Any help would be appreciated.

 

[TWF]

Probably just have to clean them really good.

 

[89fj]

check your throttle cable routing with the service manual, if it's off at all, will cause binding

 

[nakedape]

Disconnect the cables and test the rolling action of the throttle tube itself. $7 part that was likely damaged in the crash.

 

[kxmike]

Does it have cable adjustment at the carb or throttle body? If so, you might need to mess with that to get the right tension with the new cables.

 

[Babba_gee]

check your throttle cable routing with the service manual, if it's off at all, will cause binding

Disconnect the cables and test the rolling action of the throttle tube itself. $7 part that was likely damaged in the crash.

Does it have cable adjustment at the carb or throttle body? If so, you might need to mess with that to get the right tension with the new cables.

I don't think the issue is coming from the cables. I manually opened the throttle body blade by pushing down on the lever to see if it snaps shut and it still takes a while for it to close. It looks like I need to take of the throttle body and clean it entirely, was hoping to avoid that but looks like that what my next step is.

 

[Lucytriple]

Did you say you checked the action at the bar? Like is the bar bent a bit and causing the throttle tube to stick? The first thing i check when throttles aren't snapping back like they should is the return cable play. if it's too tight there is no snap

 

[thereisnospork]

Recently went through a similar sticking issue with my '06 S after it had sat for a bit, funnily enough also after a crash at T Hill.

I have the R6 throttle tube-mod, but in the course of debugging I swapped back the stock one and still had binding. In my situation, the throttle would return freely through all steps of assembly up until the housing bolts* were snugged fully tight and the last quarter turn or so.

What worked for me was a combination of two things: Giving the cables a good oil (I used 3-in-1, mostly because it was handy) and putting a few wraps of electrical tape on the clip-on beneath the housing but not the tube in order to give the throttle housing a bit more space when clamped. It took some finagling to get the tape thickness and bolt torque correct so that the throttle returns freely and housing stays secure. It is a little hackier than I'd really like but it works *shrug*.

Another possible cause I've heard is that the throttle return springs at the throttle bodies can get gunked up, and just need a cleaning. If you reach your hand in and actuate them manually they should have a sharp action (its generally bad practice to let the throttle bodies slam shut though.)

*I swapped the JIS/philips for cap head bolts - highly recommended

 

[seadog]

I ended up removing all the cables to test if the throttle bodies would open and shut quickly at the throttle body but had similar results.

I read this as you removed the cables from the throttle body and tried to actuate the throttle body with the sticking results still being active.

You have found the location of a problem. Heat no. Take it apart. There is some munge, technical term, in there causing the binding. Clean and lubricate. Something may be bent or misaligned as well. Easier to determine once you have it on the bench.

Also the throttle body may not be your only problem. Just because you fix one problem don't assume it's all good.

 

[ScottRNelson]

Whenever I've had a bike with throttle action that wasn't smooth enough, I check everything from one end to the other, one at a time, for smooth operation. Check the action at the carburetor or throttle body with the cables removed. Check the cables themselves when not connected to anything on either end, but routed as they would be when it's all back together. Then check all of the pieces on the handlebar.

Then as you put it all back together check for smooth operation at every step of the way. As soon as you get to the point of "it was smooth but now it isn't", you've identified the issue.

 

[Babba_gee]

Looks like one of the shafts is bent, so I picked up another throttle body from eBay. Hopefully that resolves the issue. Thanks everyone for the feedback!

 

[dbenj]

Looks like one of the shafts is bent, so I picked up another throttle body from eBay. Hopefully that resolves the issue. Thanks everyone for the feedback!

FYI, another common issue that we see often during tech inspection at track days is a super simple one: the grip could be rubbing against the switch gear which causes friction. 99% of the time we just pull the inside end of the grip a tiny bit and the slow-return problem goes away.

--David

 

[afm199]

also, most throttles these days have two cables, push and pull. It's not uncommon for the push cable to be too tight, which makes the throttle stick.

 

[Babba_gee]

I finally got the new throttle body installed and now the throttle snaps shut like it's supposed to. Thanks everyone for the input!