08/02/2026
A customer dropped off 1 of his 2004 Honda BF150’s for a diagnosis. Said it started running rough and the engine oil is milky.. I started by pulling the spark plugs, top 2 looked good, bottom 2 have signs of water in the cylinders. Milky oil and water in the cylinders usually points to a corroded exhaust port rather than a head gasket or oil cooler issue, so the next step was to pull the exhaust manifold and see what the exhaust ports on the head looked like. #1 & 2 ports look good #3 has some corrosion but no visible holes #4 has severe corrosion and a hole that I can stick a finger through into the water passages😱. With a hole that size it’s probably had water intrusion for some time and there’s already rust on a few of the cam lobes, so it’s possible that there’s also damage to the rod and crank bearings if it’s been run for long with watered down oil.. I’ll let the customer know what I found a see how he wants to proceed with this one.
