Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 64Get this manual
HONDA BF2OAe25A
18CRANKCASE BREATHER (BODENSEE TYPE ONLY)
Check the crankcase breather tube, and replace the breather tube which shows deterioration, damage or loose
11I SAMPLING PROBE PIPE
[21 14 mm SEALING WASHER
19EXHAUST EMISSION (BODENSEE TYPE ONLY)
Before this operation perform the following maintenancesIgnition timingSpark plugsValve clearancesCrankcase breatherCarburetor synchronizationIdle speedEXTENSION
Engine, exhaust system and analyzer become very hotWear insulation gloves avoid severe burns
1) Remove the extension grommet, and then remove the sampling probe cap and 14 mm sealing washer2) Connect the sampling tube end the sampling probe pipeNOTE