Having rotation limits on Motor6Ds?

    if Distance.X > 1.8 then
        Motor6D1.Transform = Motor6D1.Transform
        Motor6D2.Transform = Motor6D2.Transform

    elseif Distance.X < 0 then
        Motor6D1.Transform = Motor6D1.Transform
        Motor6D2.Transform = Motor6D2.Transform
    else
        Motor6D1.Transform = Motor6D1.Transform * CFrame.Angles(0,math.rad(Percent +    270),0)
        Motor6D2.Transform = CFrame.Angles(math.rad(Percent + 270)*2,Motor6D2.Transform.Y,Motor6D2.Transform.Z)

    end

Ok, this script basically coverts a part's positioninto Motor6DRotation in two CFrames. This bit of code does not show some of the variables, but they are self-explanitory. I need a way to have limits, so it cant rotatepast a certain point. How could I do this? Any help will be greatly appreciated!