Cannondale ATV Owner's Manual page 89

4. Now, drain the crankcase by removing the crankcase
drain bolt. Be sure to note and return the two crush
(sealing) washers of the drain bolt. They can be reused
but replace them with new washers if they are
damaged.
1. Crankcase engine oil drain bolt
(1)
1. Sealing washer
2. Fitting
3. Drain bolt
(2)
(3)
(1)
87