Suzuki DF200/DF225/DF250 V6 4-Stroke Outboards Service Manual, Page 214Get this manual
POWER UNIT
INSPECTION
NOTE: If any component is worn excessively, cracked, defective or damaged in any way, it must be replaced1ST TIMING CHAIN Inspect 1st timing chainReplace if worn or damaged2ND TIMING CHAIN Inspect 2nd timing chainReplace if worn or damaged