Troubleshooting idle issue after AVCC install...

giant22000 · May 10, 2010

Ok, long story short with the help of a friend we installed an AVCC recently. After the install we started the bike cruise control worked fine, but noticed that the FJR was idling about 1700 RPM's. The idle screw only was able to adjust down to 1500 RPM's. After getting home and taking it back apart I found that we overlooked hooking up one of the vacuum lines. The vacuum line is the one that connects the vacuum manifold on the back of the fuel injection rail to the airbox. I've got it apart right now and while I feel this is the cause of the idle issues, what do some of you others think? Could this be the cause? Pictures below.

Barry 07 FJR1300AE · May 10, 2010

I had the same problem when I did mine. Turned out to be that the bolt and washer used to connect the cable to the tang was too big. This makes the washer set on top of the stop and not allow the trottle to close far enough. As bad as it sucks you have to take the fuel rail back off and ether use a smaller bolt or as I did use a rivet and rivet gun, makes for a nice looking install and it is so thin it easily passes the throttle cable without touching it. You can look at the other stops on the tops of the TB's and see if they are closing, if not thats your problem. Or the chain is too tight but I am sure you have checked that.

giant22000 · May 10, 2010

Barry 07 FJR1300AE said:
I had the same problem when I did mine. Turned out to be that the bolt and washer used to connect the cable to the tang was too big. This makes the washer set on top of the stop and not allow the trottle to close far enough. As bad as it sucks you have to take the fuel rail back off and ether use a smaller bolt or as I did use a rivet and rivet gun, makes for a nice looking install and it is so thin it easily passes the throttle cable without touching it. You can look at the other stops on the tops of the TB's and see if they are closing, if not thats your problem. Or the chain is too tight but I am sure you have checked that.

Thanks for the reply. After searching around the forums a bit, I first thought this to be my problem b/c we used the larger bead chain bolt, but after carefully looking this end of it over, this is not the case. I also checked the to make sure the chain was not to tight. It has just a little bit of slack in it with the throttle fully closed. Thanks again.

giant22000 · May 10, 2010

I'm Wrong!!! After double checking this again, it appears the first nut used maybe protruding past the throttle tang ever so slightly. I can't tell from looking if this is the cause, but I guess it doesn't take much of the throttle to be open to increase rpm's. hmmm... I'll post a pic in a minute.

It looks as though the other stops on throttle bodies have a 1/16" - 1/8" gap in between the stop screw. Should they be touching the stop screw?

Barry 07 FJR1300AE · May 10, 2010

giant22000 said:
I'm Wrong!!! After double checking this again, it appears the first nut used maybe protruding past the throttle tang ever so slightly. I can't tell from looking if this is the cause, but I guess it doesn't take much of the throttle to be open to increase rpm's. hmmm... I'll post a pic in a minute.
It looks as though the other stops on throttle bodies have a 1/16" - 1/8" gap in between the stop screw. Should they be touching the stop screw?

Everything should be closed against a stop in the idle position. The idle adjustment adjusts fuel to air not position.

giant22000 · May 11, 2010

Barry 07 FJR1300AE said:
I had the same problem when I did mine. Turned out to be that the bolt and washer used to connect the cable to the tang was too big. This makes the washer set on top of the stop and not allow the trottle to close far enough. As bad as it sucks you have to take the fuel rail back off and ether use a smaller bolt or as I did use a rivet and rivet gun, makes for a nice looking install and it is so thin it easily passes the throttle cable without touching it. You can look at the other stops on the tops of the TB's and see if they are closing, if not thats your problem. Or the chain is too tight but I am sure you have checked that.

Gladly I double checked this again and indeed this was the problem. Put new bolt and nut on (smaller), which actually clears the throttle cable a little better, hooked everything back up and once the bike warmed up, normal RPM's! Success!!! :yahoo:

Barry 07 FJR1300AE · May 11, 2010

giant22000 said:
Barry 07 FJR1300AE said:

I had the same problem when I did mine. Turned out to be that the bolt and washer used to connect the cable to the tang was too big. This makes the washer set on top of the stop and not allow the trottle to close far enough. As bad as it sucks you have to take the fuel rail back off and ether use a smaller bolt or as I did use a rivet and rivet gun, makes for a nice looking install and it is so thin it easily passes the throttle cable without touching it. You can look at the other stops on the tops of the TB's and see if they are closing, if not thats your problem. Or the chain is too tight but I am sure you have checked that.

Click to expand...

Gladly I double checked this again and indeed this was the problem. Put new bolt and nut on (smaller), which actually clears the throttle cable a little better, hooked everything back up and once the bike warmed up, normal RPM's! Success!!! :yahoo:

congrats you got it fixed. this forum is so great!!!

giant22000 · May 11, 2010

Barry 07 FJR1300AE said:
congrats you got it fixed. this forum is so great!!!

Yes this forum is great! What's funny is I did check the tang over carefully, but after reading your post I checked it out one more time and found the problem...

:yahoo:

Troubleshooting idle issue after AVCC install...

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