Topic: Why does my bike have two idles?

[dgilling]

When I pull up to a stop light to idle the bike will idle fairly high but some what normal, but when I hit the throttle quickly just right the idle will drop down much lower.  The bike will possible die if it's not warmed up enough and if the bike is really warmed up then the first idle will be too high.  The only thing I can think of is I don't have both the push and pull cables hooked up (just the pull).  I also don't remember this happening before I rebuilt the carbs.

[seaweb11]

Sounds like it's just not pulling back all the way.

Lube cable again?

[MCRider]

When I pull up to a stop light to idle the bike will idle fairly high but some what normal, but when I hit the throttle quickly just right the idle will drop down much lower.  The bike will possible die if it's not warmed up enough and if the bike is really warmed up then the first idle will be too high.  The only thing I can think of is I don't have both the push and pull cables hooked up (just the pull).  I also don't remember this happening before I rebuilt the carbs.

What bike?  regardless, the B cable should be there only as a tag along. Your carbs should return smoothly and completely to idle without it. Something is hanging up, likely the A cable to begin with. If not, we'll need to know the model to discuss particulars.

Its not abnormal to have to set the idle up, or hold it up with the throttle, while it warms up. But once warm, everything should work properly.

[Gordon]

This started happening after you rebuilt the carbs.  Did you vacuum synch them as the final step?

[Hush]

My guess is clogged cables making them hang up in there somewhere.

[scunny]

chech the routing of the cable as well, you don't want any kinks

[dgilling]

This forum is always so great at promptly feedback...thanks.

Its a 77 750.  I'll check the routing and give it some lube and see if that helps.  I have a really nice syncing guage and yes I synced them properly after the rebuild.

[MCRider]

This forum is always so great at promptly feedback...thanks.

Its a 77 750.  I'll check the routing and give it some lube and see if that helps.  I have a really nice syncing guage and yes I synced them properly after the rebuild.

When I was younger I always approached problems wrong, thinking that mine was something special. There were tens of thousands of your bike put on the road and the throttles all worked perfectly. Yours can to.  Don't get hung up on the B cable. It is a safety device not a functional necessity. Your throttles should work just like they did in 1977, smoothly and completely. Take it step by step.

I do lean towards the A cable being too tight at the adjuster at the twistgrip. Give it all the slop it has to give and see if it returns to idle. If so, got it. If not, its somwhere else.

If there is no slop to give then back off the adjuster on the bell crank. You should have a little room to adjust at both places.