Originally Posted by
Jughed
So, I should have said - in relation to your equipment. Yes, the motor can change, improve, be out of tune... but day in, day out -your motor is your motor.
The other factors have an effect on everyone, regardless of motor.
Alas, though, the aging of the motor is inevitable. You're right, the difference is I can always replace a worn tire.. The effects of aging will, of course, vary from person to person.