Had a go at servicing my X10 500 over past 2 days. Engine and gearbox oil changes relatively easy as I'd done them before. But beware when draining gear oil that it will drip onto wheel if left on either stand. Best to hold a container up to drain, only 250cc.
Being a lazy sod I wanted to remove as little bodywork as possible. To change air filter I followed You Tube video from R&R and removed whole airbox first
https://www.x9gallery.co.uk/home/displayimage.php?album=lastup&cat=10265&pid=19259#top_display_mediaInjection air intake can be removed at underseat hatch (easy) and so can thick breather hose (less easy) (Before starting work I tried to give engine and accessible parts under seat a good clean to stop dirt getting in once hoses and covers removed) The narrow capped breather hose has to be unclipped at cap end but can just be left attached to airbox. When whole assembly removed the narrow hose can be uncapped and drained.
Air filter element is washable but I used a new one soaked in oil. I will clean up the old one so it is ready to go in at next service. I replaced the thick breather hose clip with a stainless jubilee clip, so should be easier to remove next time)
https://www.x9gallery.co.uk/home/displayimage.php?album=lastup&cat=10265&pid=19260#top_display_mediahttps://www.x9gallery.co.uk/home/displayimage.php?album=lastup&cat=10265&pid=19261#top_display_mediaPresuming the valves had never been adjusted, I decided to have a go. Access from underseat and 2 small side panels is tight but workable. The rocker cover can be completely removed but which doesn't seem to be the case with MP3 from viewing You Tube videos. To rotate the engine to tdc you do have to remove the final drive plastic cover which requires some lower left rear bodywork to be undone and loosened. I would recommend an assistant to view the flywheel inspection port alignment as you rotate the engine. I was on my own and was lying under bike on rhs viewing port through mobile phone endoscope and turning ratchet on lhs of bike! When flywheel marks line up you have to check cam sprocket arrow also lines up (see workshop manual as I didn't get photo)
https://www.x9gallery.co.uk/home/displayimage.php?album=lastup&cat=10265&pid=19262#top_display_mediaValve clearances were fine on 3, 1 exhaust valve felt slightly tight so was adjusted. Everything back together after putting in new spark plugs and amazingly started first time into smooth tickover.
I'm sure I could do it in about half the time next time now I know where everything goes. Drive belt is due to be changed soon so that will be the next job. I did have a look on the endoscope and it looks OK, no fraying or damage, so hopefully OK for a while yet.