Odd throttle behavior

Message

jonnie_r · #1 Post by **jonnie_r** » Fri Jun 28, 2013 6:29 am

I seem to be having trouble with my throttle, whilst short shifting and despite having the throttle fully closed and the clutch pulled fully in, the revs don't die as they are supposed to and it seems like I am a ham fisted idiot who doesn't know how to change gear ( sometimes it probably is just me

).

Also when approaching a corner sometimes the engine braking doesn't happen at all, which leads to a mad dash for the front brake.

I can't remember if this happened before I fitted the FA eprom, though something in the back of my very empty head tells me it did.

Has anyone else experienced this?

wannesd · #2 Post by **wannesd** » Fri Jun 28, 2013 6:57 am

Perhaps someone adjusted your idle thingy on the right side?

jonnie_r · #3 Post by **jonnie_r** » Fri Jun 28, 2013 7:07 am

Nope, it idles normally, and cuts out if I push that back to the original position when cold. The revs do drop away if I change a lot slower, oops missed that from the original post.

The only person who has touched my bike was Griff at AP when he set up the mixture for the new eprom and air kit.

Aladinsaneuk · #4 Post by **Aladinsaneuk** » Fri Jun 28, 2013 7:13 am

check the routing of the throttle cables - may have been disturbed with the work you had done

jonnie_r · #5 Post by **jonnie_r** » Fri Jun 28, 2013 7:22 am

Cheers, will do once it stops bloody raining, though I hope it isn't as it was me that did the air kit and eprom

D-Rider · #6 Post by **D-Rider** » Fri Jun 28, 2013 9:13 am

There have been a few cases of the screws on the butterflies coming loose and the throttles not closing completely - worth a check.

and WELCOME TO THE FORUM wannesd - you can't sneak in unnoticed

blinkey501 · #7 Post by **blinkey501** » Fri Jun 28, 2013 9:42 am

wannesd wrote:Perhaps someone adjusted your idle thingy on the right side?

Go on then get to the bar

wannesd · #8 Post by **wannesd** » Fri Jun 28, 2013 10:56 am

D-Rider wrote:There have been a few cases of the screws on the butterflies coming loose and the throttles not closing completely - worth a check.

and WELCOME TO THE FORUM wannesd - you can't sneak in unnoticed

crap

flatlander · #9 Post by **flatlander** » Fri Jun 28, 2013 11:20 am

I had something similar once ... acn't for the life of me recall what it was though ... so that helps then not

I'll check to see if I made a note but it wasn't anyhting major that i am sure of and it wasn't the cables and it wasn't the butterflies

anzacinexile · #10 Post by **anzacinexile** » Fri Jun 28, 2013 3:36 pm

Small vacumn leak will do that

D-Rider · #11 Post by **D-Rider** » Fri Jun 28, 2013 3:51 pm

anzacinexile wrote:Small vacumn leak will do that

.... indeed - and your coffee will get cold

jonnie_r · #12 Post by **jonnie_r** » Fri Jun 28, 2013 3:58 pm

Right, butterfly screws are properly located and while the cable has been rubbing where it goes through the gap between the frame and tank, it didn't look excessively tight.

Guess 'll look at the vacuum system next then.

jonnie_r · #13 Post by **jonnie_r** » Sat Jun 29, 2013 3:33 pm

Well before stripping apart I did some more Googling and found this thread

http://www.apriliaforum.com/forums/show ... osed/page2

Following the suggestion and holding the throttle open then gradually closing it seems to have rectified the problem on a quick ride out this afternoon.

D-Rider · #14 Post by **D-Rider** » Sat Jun 29, 2013 5:20 pm

I'm surprised - that's a thread in the Futura forum ..... and they have a completely different engine management system.
That said, it's not inconceivable that they've implemented the same strategy for this.

jonnie_r · #15 Post by **jonnie_r** » Sat Jun 29, 2013 7:52 pm

I know but hey I'll give anything a go, and it seems to have done the trick, though I'll keep an eye on it this week.

I imagine they both use the same ECU and throttle components so it would make sense for it to work the same.