SHERCO 2013 SE 250i-R Shop Manual page 17

Inspect the cylinder head for flatness:
•
Place the
fezf
workbench
•
Using a precision straight edge [A] and a
feeler gauge check the head for warpage;
check in several places as shown in the photo.
If the warpage is above the limit, repair if
possible. If the damage is severe replace the
head.
Cylinder head warpage:
Limit = 0.05 mm
Visually inspect the timing chain for damage:
Inspect the timing chain by flexing it to
determine if there are any tight spots. If tight
spots are found it should be replaced.
Check the automatic chain adjuster and make
sure that it is not in the last ratchet notch.
Visually inspect the cam tensioner guides:
Visually inspect all of the cam chain tensioner
channel guides and pads including the ones on
the cylinder head cover.
Change as necessary.
Valve - Guide clearance :
Intake :
Mini clearance : 0.02 mm
Maxi clearance : 0.045 mm
Escape:
Mini clearance : 0.04 mm
Maxi clearance : 0.065 mm
cylinder head on the
16/54