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If you look at the two cables the idle has a small spring down at the throttle body end.
The throttle cable goes from the front of the grip to the inside of the throttle body and the idle goes from the rear of the grip to the outside of the throttle body.
Or if you grab the housing of the cable with one hand and grab the end with the other hand. Now pull on it. If you feel your throttle move, you have the throttle cable. That one goes in the front. If it doesn't move, you have the idle cable. That one goes in the back.
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