No. Let me get this straight. To get more horsepower from an engine you need to add more fuel and run a hotter plug. That means if I use a colder plug and decrease the amount of fuel I put in a cyLinder, I may lose a little horsepower, but will save money. In the push mower and lawn tractor, plus most other small engine equipment, I doubt most consumers would notice a difference and they would be saving money. That’s the reason they shouldn’t have their equipment serviced by a trained technician, right. Now I have a question for you. With the vast majority of today’s small engines using non adjustable carbs, do I have to spend more money on an adjustable carb? Or do I have to have the jets punched in the carbs I now have by a trained technician, who you say are just trying to get more money from me? I think I’ll just stick to the spark plug which the engine manufacturer says will work best for the engine I have and not spend more money. Wait a minute, what am I saying? I’m a trained technician and doing that will be taking money out of my pocket. To all the DIY guys out there, disregard what I’m saying, as I’ve get some adjustable carbs and know how to punch carbs with my micro drills. I now have learned how to get more money from your pocket. Glad they reopened this thread, as I’ve learned how to make more money today.