2002 Bombardier Quest 650XT Service Manual, Page 123Get this manual
Subsection 09
Section 03 ENGINE (CRANKSHAFTBALANCER SHAFT)
Inspection
Check balancer shaft and replace if damagedCheck ball bearings on MAG and PTO side for excessive play and smooth operationReplace if necessary (see GEAR BOX for proper procedure)If the gear on the balancer shaft is damaged, replace balancer shaftCheck gears on the crankshaft and replace crankshaft if necessary (refer to CRANKSHAFT below)
Installation
R610motr65A
1Timing chain 2Intermediate gear 3Drive gear