Honda Hrb 425 Push Mower

I’ve had this mower from new, which was about 15 years ago maybe more. I had it serviced once about five years ago. I have since changed the cutting blade after I buckled it on a tree root. I have also changed the spark plug to make it start more easily. My dad’s just given me his old one so this one is spare. If I was to keep the mower I would replace the chord as it is something I’ve fitted and it’s a little too short. However, the mower still starts easily (second pull yesterday) despite the short chord, cuts well and catches the grass. It doesn’t use up the oil.