gavin dunne
Cadet
- Joined
- Jul 17, 2005
- Messages
- 23
Hi I have a pair of NGK B6S plugs in a 1967 6hp Johnson. I've just noticed that the portion of the ceramic which isn't covered by the plug caps is covered in a fine soot. What causes this? Is this a problem and do I need to change something?
<br /><br />Use only Champions in OMC products. In this case use Champion J4C gapped at .030" for all round use, .040" for mostly trolling and low speeds.<br /><br />My guess is that you have exhaust gasses, including unburned fuel, in the bonnet making deposits on the insulators. If it gets extreme it can strangle your engine.