I put a new 88cc china girl in my road bike it runs great but I have no throttle response..
Hi Warrior, welcome.
Just for your info you have a 66cc 2-stroke engine and whatever marketing claims you read are BS.
Chances are you have the NT carb and it's easy.
Pull the air cleaner off and look inside as you twist the throttle.
The grey barrel inside should go up and out of the air passage at full throttle, then let go of the throttle.
The retaining spring slams that grey barrel down to the idle set screw leaving just a touch of room for airflow at idle.
If not you know where to look.
There are cable length adjuster at each end of the throttle, they both have retaining nuts, pull the one off of the NT's cable nipple, that a couple mills right there.
On the throttle itself the L tube can be screwed in as well as it's cable adjuster retaining nut.
Cables have 2 parts...
The actual metal cable itself, and the outer sheath, it's the sheath that determines the cable end length, and it's adjustable.