Musky, should be ok to wash it. I used to do it heaps, what you need to look out for are:
- dont squirt too much water on the rocker cover, as it doesnt seal too good so getting water inside (on spark plugs) will cause u dramas.
- dont wet air filter if you have a POD not enclosed, for obvious reasons
and finally let it dry before turning it on... as psi parts said, for electronics reasons, and also because ur belts will be slippery and may cause annoying sounds lol....
other then that have fun making ur engine bay sparkle!!!!