I was just wondering what parts i need to change on the motor on a regular basis to keep it healthy. I scored a new piston and liner, piston pin, con rod plus front and rear bearings for a great price in the event that it needs to be rebuilt someday soon. Ive done alot of reading and it seems people change con rods on a regular basis. Why is this the only regularly replaced part compared to the other ones? Should i be investing in more rods??