1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 160Get this manual
6-17 POWER UNIT
INSPECTION
NOTE: If any component is worn excessively, cracked, defective or damaged in any way, it must be replaced
Timing chain Inspect timing chainReplace if worn or damagedTensioner adjuster Inspect tensioner adjuster for smooth operationReplace if faulty