If you have no marks on the rotor perhaps you have aftermarket 5 degree ignition advancer. It's very strange though that you have no marks on camshafts(unless you have gsxr cams and somebody machined them off). Either wau if you want to check valve clearance without any marks just rotate the crank to have cam lobes pointing up(vertically) and measure the clearance. Once you measured all clearances for valves which had cam lobes poiting up again rotate the crank so remaining lobes point vertically and measure those. It's a shortcut way but it's still good.

@@Adikxx maybe..it's a bit of a mystery machine, bought cheap with unknown history as a project. Slowly getting through the little jobs to get it up and running again. From cam positions alone and the rotor being in what would be the T position all seems pretty good. Only trouble is I dropped one of the rubber rocker cover washers down the timing chain hole in the middle so I've got to locate that now

Cause finding informations about the rf900r is very rare indeed plus you explain everything really well

niet iz Polshy toge ;)

From Lithuania too👍

Ebay

Yes, very similar procedure for rf600

@@Adikxx thank you

Hi buddy, my spark plugs are Iridium NGK CR9E and my ignition coils are Dynatek 3 ohm. Hope this helps, regards!