i had noticed my crf50 got a little warm today after riding it for a hour or two. i weigh 250lbs and my buddy who was also riding it is 180lbs, i just figured it was a strain on the engine. will the knock off or takegawa oil cooler kits work on a stock 50cc engine? do i need a high volume oil pump to run one? ive seen valve cover nuts with a breather tube coming off them, is it needed for the oil cooler. or is it just to vent hot air out of the head?