I've made the projects carousel to show 6 items, now I need that it advance or go back 6 items, for

I've made the projects carousel to show 6 items, now I need that it advance or go back 6 items, for making the carousel to show 6 items, I only changed the carousel.js file in the for cycle to go up to 4, like this: for (var i=0;i<4;i++), but I dont know how to make the scroll to advance 6 items, on index-portfolio.php in the section project scroll I got: 
<li><a class="project-prev" href="#newCarousel" data-slide="prev"></a></li>
<li><a class="project-next" href="#newCarousel" data-slide="next"></a></li>    

¿Is there any way for making the data-slide="prev" and "next" to advance 6 places? ¿Could you kindly give me support about this issue?

My carousel.js file ended this way (the yellow highlight is the only change I've made, the screen shot of the results are shown here and here (all the images only advance one element at time)

jQuery(document).ready(function($){
// Project Scroll Js
jQuery('#newCarousel .item').each(function(){
  var next = $(this).next();
  if (!next.length) {
next = jQuery(this).siblings(':first');
  }
  next.children(':first-child').clone().appendTo($(this));
  
  for (var i=0;i<4;i++) {
next=next.next();
if (!next.length) {
next = $(this).siblings(':first');
}
Captura de pantalla 2018-02-24 17.42.24.png
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Captura de pantalla 2018-02-24 17.43.04.png
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