How can I make this boat have a max speed?

local re = game.ReplicatedStorage:WaitForChild("re")
local boat = script.Parent
local bounce = false


function goForward(move, speed)
    move.Parent = boat.basepart1
    move.MaxForce = Vector3.new(math.huge,0,math.huge)
    move.Velocity = speed
    boat.basepart1.Velocity = speed
    boat.stats.acceleration.Value = 1
    bounce = true
    while boat.stats.forward.Value == true do
        wait(0.5)
        move.Velocity = boat.basepart1.CFrame.lookVector*(move.Velocity.magnitude+boat.stats.acceleration.Value)
        if boat.stats.acceleration.Value <= 4.6 and boat.basepart1.Velocity.magnitude < 36 then
            boat.stats.acceleration.Value = boat.stats.acceleration.Value + 0.3
        end
    end
    bounce = false
    boat.stats.acceleration.Value = 1
    while boat.stats.forward.Value == false and boat.basepart1.Velocity.magnitude > 2.9 do
        wait(0.5)
        print(boat.basepart1.Velocity.magnitude," ",boat.stats.acceleration.Value)
        move.Velocity = move.Velocity - Vector3.new(boat.basepart1.CFrame.lookVector.x, 0, boat.basepart1.CFrame.lookVector.z)*boat.stats.acceleration.Value
        if boat.stats.acceleration.Value <=5 then
            boat.stats.acceleration.Value = boat.stats.acceleration.Value + 1
        end
    end
    if boat.basepart1.Velocity.magnitude < 4.6 then
    move.Velocity = Vector3.new(0,0,0)
    end
end


function turn(move, direction)
    if direction == "a" then
        while direction == "a" and boat.stats.turning.Value == true do
            wait()
            boat:SetPrimaryPartCFrame(boat.PrimaryPart.CFrame * CFrame.Angles(0,0.004,0))
        end
    elseif direction == "d" then
        while direction == "d" and boat.stats.turning.Value == true do
            wait()
            boat:SetPrimaryPartCFrame(boat.PrimaryPart.CFrame * CFrame.Angles(0,-0.004,0))
        end     
    end
end

re.OnServerEvent:connect(function(player, input, stroke)
    if boat.stats.driver.Value == "" then
        boat.stats.driver.Value = tostring(player)
    end
    if (tostring(player)) == boat.stats.driver.Value then
        if input and stroke then
            if input == "w" and stroke == "press" and bounce == false then
                bounce = true
                boat.stats.lastSpeed.Value = boat.basepart1.BodyVelocity.Velocity
                boat.stats.forward.Value = true
                goForward(boat.basepart1.BodyVelocity, boat.basepart1.BodyVelocity.Velocity)
            elseif input == "w" and stroke == "release" then
                boat.stats.lastSpeed.Value = boat.basepart1.BodyVelocity.Velocity
                boat.stats.forward.Value = false
            elseif input == "a" and stroke == "press" then
                boat.stats.turning.Value = true
                turn(boat.basepart1.turn, "a")
            elseif input == "d" and stroke == "press" then
                boat.stats.turning.Value = true
                turn(boat.basepart1.turn, "d")
            elseif input == "a" and stroke == "release" then
                boat.stats.turning.Value = false
                --stopTurn(boat.basepart1.turn)
            elseif input == "d" and stroke == "release" then
                boat.stats.turning.Value = false
                --stopTurn(boat.basepart1.turn)
            end
        end
    end
end)

You really only need to focus on the goForward function, since that's what makes the boat move forward. I've got it so that you can turn the boat and it will move in the direction that it's turning, and I also have acceleration and de-acceleration down. However, I just can't seem to figure out a way to make this boat have a max speed. I want it so that the boat cannot go over a certain speed. Can anyone help me out?