Re: Why is my HD25 overheating? Home › Forum › Ask A Member › Why is my HD25 overheating? › Re: Why is my HD25 overheating? cajuncook1Replies: 842Topics: 72 August 18, 2018 at 12:07 am #81386 Your rotor in the picture is either wrong size/part or it has swollen over the years from grease and oil. Because it is so swollen, it does allow gaps to gulp enough water to cool your motor.