…and keeps operators from running slightly rich for safety. Every fixed jetted carb motor I have received I go one hotter plug and jet to that. The folx on the chainsaw forums understand this. Manufactures have no incentive to make their products live much past warranty period. By running short on oil and slightly lean this is accomplished.
The only 4 stroke outboard I have owned from new was jetted too lean for optimum operation also. Most carbed 4 strokes of today are jetted slightly lean …especially the low speed jet.
