Different colors mean different things. Don't ignore it.
What to Check
1
White smoke
Steam from cooling water leak (head gasket, exhaust riser) or unburned fuel from a misfire.
2
Blue smoke
Burning oil. Worn rings, valve guides, or in 2-stroke outboards, just normal.
3
Black smoke
Too much fuel. Clogged air intake, bad injector, or engine running rich.
When to Call Us
Smoke from any 4-stroke engine that's not normal start-up steam needs diagnosis — we run scan tools and compression tests to find the cause.