I picked up an older Honda 7.5hp outboard. It's in nice shape cosmetically, but hasn't been used in a while. I put it in a tank to test, and it fired up but smoked heavily at first. After a while, smoking seemed to settle down, but even after running for 15 minutes or more, it's still smoking a fair bit. A compression check shows about 150 psi on top and bottom cylinders. I'm wondering if anyone with experience with these motors might advise me of likely causes of the smoking. I have drained the oil out, and will replace with fresh and repeat the test. The oil that drained out was brown in colour.
I've done a bit of searching online, and have found very little information other than an owner's manual. Any hints of where to look next would be great.
I've done a bit of searching online, and have found very little information other than an owner's manual. Any hints of where to look next would be great.