[johncub7172]

I had questioned the same topic about my gear drive garden tractor, once. A problem with a bigger pressure spring, is that now you have added pressure on other clutch components, like the release lever twisting resulting in a prematurely worn throw out bearing. It has been said, operating the clutch/brake pedal is rather a inconvenience as well. The factory main spring has worked just fine in my 71. I have pulled a 2,000 pound yard roller with no slip at all. Maybe a new pilot bushing, teaser spring, clutch disk, true pressure plates, spiral pins, and throw out bearing depending on the condition of the system. The release lever should be inspected for wear as well.