from the owner's doc at left of main screen:
Adjusting the tappets
If engine is standard but for racing; adjust every 2nd ride otherwise for regular trail riding it can be left to 6-10 hours and then even longer if never out of adjustment.
Take the rocker inspection caps off, remove the plug and take the ignition cover off. Using a socket and T-bar or stepped 17mm spanner; turn clockwise until both sets of tappets are closed (wait for the inlets to come up and close-now stop!). The timing marks on the flywheel should be at 12 o' clock and inline with the top screw hole for the ignition cover. Use a rod through the plug hole to confirm that the piston is near to TDC.
Undo both inlets as a pair and adjust gently and you should feel the screwdriver tighten "lightly" with your finger tips. Run up to this 'stop' 2 or 3 times and note where on the clockface the screwhead is? Is it 3.45? or 4.50? etc and from here back-off 1/6th-of-a-turn (or try joeUSA's tool) and hold still whilst tightening the lock nut. Check it again and if the 1/6th-turn has become less: actually turn the screwdriver back against the nut slightly as you're locking.
To do the exhaust tappets, firstly flick the decomp wire off relieving the pressure off the exhaust rocker. Now proceed in the same way and fit the spring again afterwards.
Give a last check after you've done both that you can grab a rocker and lift and lower it slightly. Another simple check is to see how much lateral movement there is on the rocker shaft? Just a tiny amount should be felt. If it's over say: 0,5mm, then undo the end two cover screws slightly and tap the endcaps across slightly whilst checking by hand for slack.
Be warned that setting the tappets with feeler gauges is at best fraught with problems! To get a feeler gauge in is hard. Then the pads themselves wear concave which gives a false reading.
