aldot, the Kawasaki FJ180V has a Hobourn-Eaton (ie, trochoidal) oil pump driven by the camshaft. An oil filter is optional. The old side-valve Honda engines had a similar arrangement except there was no filter, but Honda discontinued the pump when they switched to OHV in the early 1980s. Kawasaki kept it. That may be part of the reason Kawasaki allows tilt angles up to 30 degrees for that engine (Briggs limits slope of its side valve engines to 15 degrees. Honda allows 20 for its OHV engines.)
In case you are interested in the engine, here is the owner manual:
http://www.poweruplawncare.com.au/bushranger/owners_man/fj180v_owners_man_web.pdfIf you are need more information, say so.
