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Part of all bikes setup is to test the cable runs with full side to side swing off the handlebars to test the throttle cable run.
Nothing wrong, just remove the headlight to get easy access to all the cabling and wires and trace the throttle cable down the handlebars and around the steering post and side of the frame. On the left side frame behind the steering post is a cable holder. Some assemblers run the electric wiring harness first then run the throttle cable next leaving the cable on the outside of the harness further from the frame. Just reverse it and have the throttle cable first then put the wiring harness on top of it so there is less stretch placed on the throttle cable.
From there trace the cable as it passes through the frame to the other side and check the cable run on that side to the carburetor itself.
When satisfied start the motor and do full side to side turns of the handlebar to test the full range of motion and check for no strain on the throttle cable causing the engine to increase rpm at the far end of range movement.
Full user setup also includes adjusting the brake and the throttle lever positions to the intended rider and handlebar position to match the rider. If you have the time complete a full setup.
I lube with silicone spray the inside of my throttle cable at least twice a year as my maintenance schedule.
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