BOMBARDIER ELAN 3042 1985 Shop Manual page 206

Section 02 ENGINE
Sub-section 09 (537 ENGINE TYPE)
INSPECTION
1, 5, Rotary valve cover & rotary valve
A gap of 0. 27- 0.48 mm (011 - .019") must be main-
tained between the rotary valve and the crankcase.
To measure this gap use a feeler gage inserted between
rotary valve and upper crankcase with the rotary valve
cover in place without it's 0-ring . Check as much sur-
face as possible. Follow the same procedure for the lower
crankcase.
A013002024
02-09-22