2004 Skidoo ZX Series Service Manual, Page 277Get this manual
Section 05 ENGINES (4-TEC) Subsection 07 (CRANKSHAFTDRIVE GEARS)
TIMING CHAIN
The engine is equipped with two timing chains no28 and no29One of the timing chains is located on the engine alternator side behind the ignition coverThe second is located on the PTO side behind the PTO cover
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Removal of Alternator Side Timing Chain
Remove: ignition cover (refer to COOLING SYSTEM) chain tensioner and chain guide (refer to CYLINDER AND CYLINDER HEAD) camshaft sprocket (refer to CYLINDER AND CYLINDER HEAD) oil pump gears no24 (refer to LUBRICATION SYSTEM) crankshaft drive gear no7 (refer to DRIVE GEARS)Carefully pull the timing chain sideward and down from the crankcase
1Timing chain
If chain is excessively worn or damaged, replace it as set (camshaft sprockettiming gear and timing chain)