Welcome to the forum Katey, 
I've never done the job myself on that engine so I'm afraid I have no words of experience to offer but here is the manual for that engine with torque specs and the preferred order of tightening the head bolts as well as information about adjusting the valves.
http://www3.kawpowr.com/enginesecure/ServiceManuals/FJ180V.pdf
I've never done the job myself on that engine so I'm afraid I have no words of experience to offer but here is the manual for that engine with torque specs and the preferred order of tightening the head bolts as well as information about adjusting the valves.
http://www3.kawpowr.com/enginesecure/ServiceManuals/FJ180V.pdf