Mystery Problem...please help!!!!!

[gs650girl]

We put a new engine from a parts bike into my '82 gs650l. It has been running great except for one problem...when you turn the handlebars to the right the engine revs and when you turn the bars to the left it idles way down. Things that we have tried...
1. It's not in the carburators.
2. Gone through all the electrical wiring, no broken wires.
3. Replaced throttle cable...it isn't catching or pulling.
4. Replaced the choke cable.
5. Put on new vaccum lines for fuel.
6. It doesn't do it when the bike leans to the left or right, only when the bars are turned.
7. Re-routed all the electrical wires to make sure they are free and not pinching.
8. Put a voltage meeter on it, it shows that everything is fine.
9. It is only when you turn the handlebars to the left and right.

We can't figure out what else it could be. Any suggestions would be extremely helpful!!!

[tkent02]

Go back over the throttle cable, it is adjusted too tight and likely not routed very well.

At idle there should be some slack no matter where the bars are turned. The throttles in the carburetors should go "Clack" when you close the throttle quickly.

Sometimes the cable routing looks OK, but things change when the gas tank is installed.

[Mekanix]

Cable definitely cable

turn the bars right till it revs and then loosen the cable till it idles down,

Mine does the same

[gs650girl]

re

Well the cable is completely loose no matter which way the bars are turned and does make the "clack" so we can't see why it would be that either

[apogeecustom]

Loose should mean that at the throttle cable bracket on carb 3, with the nuts all tightened down, there is at least 1/16" of play in the cable.

[chef1366]

Take the cable off and see if it does it.