1986 Ski-Doo Factory Shop Manual, Page 212Get this manual
Section 02 ENGINE Sub-section 10 (ENGINE DIMENSIONS MEASUREMENT)
Measurement
To determine piston to wall clearance, the piston should be measured right under the axis hole and the cYlinder should be measured 16 mm (SIS"} below its top edge
NOTE: Ringpiston groove clearance can be measured only on rectangular ring
AOO1001G2S
RING END GAP
ENGINE TYPE
MINIMUM-MAXIMUM
0.200,35 mm C008.014" 1
All 1986 engines
Position ring half way between transfer ports and intake portOn rotary valve engines, position ring just below transfer portsAIJ(llOOZG24
NOTE: In order to correctly position the ring cylinder, use piston as pusher