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In Reply to: Pulleys and lightweight Clutch posted by Dr.D on February 27, 2000 at 12:29:06:
most underdrive pulleys aren't balanced and with a light weight fly wheel can create a high frequency vibration, which may cause micro cracks on your crank if kept in high revs long enough...
The stock m clutch is balanced so replacing the pulleys gives you something. It's going to be a light weight clutch for me when I need a new one...