The 1000 1100 motors are considered bulletproof as long as you change the oil and be consistent about service. I would recommend learning how to do your own valve adjustments, its not that difficult and you will save a boat load of money. You should do as I did out here, host a valve adjustment workshop. Gather up participants (no problem there) and find someone who is knowledgeble with the process. It is generally true that after each valve adjustment the clearances become more stable and you can actually spread out the service interval.