12/09/2026
🔧 QUICK ENGINE DIAGNOSTIC TIP 🔧
You can tell a lot about your outboard just by looking at the cylinder head!
WHITE cylinder = No combustion
Possible causes: Bad spark plug, No fuel, Low compression
BLACK/DARK cylinder = Combustion is happening
But too much carbon = running rich
If 1 cylinder is white and the others are black, you’ve found your dead cylinder 👌
This works on Johnson, Yamaha and most outboards.
Need help diagnosing yours? We’ve got you.
LIKE & FOLLOW Altron Marine for more boat engine tips.
We’re on all platforms as Altron Marine
📞 Contact: 0774329544
📧 Email: [email protected]