Can someone help me with "Instance.new" problems?

This is the basic gist of my script

local speed = Instance.new("NumberValue", script.Parent.Parent.Cannon.Cannon.Mouth)
speed.Value = 1





function OnTouch(hit)

speed:clone()


end
script.Parent.Touched:connect(OnTouch)

The output error is: "speed is not a valid member of Part"

Can someone help? I'm confused.