you can hose it off.. BUT PLEASE MAKE SURE THE ENGINE IS NOT HOT
this can cause SERIOUS damage 2 the Engine (Engine Case May Crack!)
so, a good way 2 check is spray the End of your Exhaust, if the water just vaporizes STOP lol
wait awhile then give it a hose down, but be careful & look 4 any steam coming off engine!
installing a small fan that runs off the Stator is something 2 think about if you go 4 long rides...
I had 2 do that 4my 2002 Scorpa SY250 Trials Bike, it came with a Fan but I had problems with it..
so then ran a Small Battery with a relay & sum electric mumbo jumbo so it'd run 20seconds after shutting the bike off! had help from my electrician Cousin
haha but it worked AWESOME!
plus, if you ever get a bike thats liquid cooled, get a bottle of "Water Wetter" cools engines by 23degrees (Celsius) which you'll actually notice & feel on your legs if you've ever ridden long distances
"Water Wetter" is sold in Canada, I'm not sure if its available in Australia or not.. but you should go check it out!
cheers,
JakeStef