Suzuki DF25/DF30 Four Stroke Service Manual, Page 130Get this manual
POWER UNIT 7-13
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 faultyCheck oil delivery passage to tensioner