i am just not sure about this product, i am not saying its not good since i never try-it but ear my points,the head is cool down,but the rest of the cylinder is as hot as usual so it could cause some stress on the piston ,if this system was any good the company like yamaha and honda and other would have never spend so much time and money in research and developpement ,to put a complete cooling systeme to the cylinder and put a pump inside the engine anyway since i got no proof thats this pruduct actually work i will invest my money els where ,but its just my opinion , it could work really good but its not for me just my 2 cents!!!!