For your deployment, lets say it will be 18 months (I hope it will be much shorter for you since you are going overseas), what everyone above is saying are all good things to do.

What I personally would do is this: (You dont have to go to this extreme, I just personally like to take extra steps that would save me time for when I come back). I would dismount the engine and totally disassemble the engine to the basic components. I would then put them in some long lasting oil (oil that whould be thicker than the CLP you use on you weapons). Yes, they engine does not like that when it is running, but I do this for the sake of protecting the parts in long term. Then when I return, I whould thoroughly clean off the thicker oil, some which might have caked on, but since the engine is already apary, all you have to do is clean each part in depth and remove all that oil. Then, once fully cleaned, I would lube all the parts with after run oil and reassemble.

The only part that I would not put that heavy oil is the carb. Afterrun oil, yes, on the parts that can bear it. But of course, I would detail the carb as much as possible when I come back, making every step to clean off any caked on afterrun that has festered onto the carb for the long time.