I recently put a couple of gizmos in that raise the spark plugs up, in my Kohler twin. I'd never heard of these, but am given to understand they've been in widespread use for years, in engines with an oil burning problems. Their main purpose is to reduce oil fouling plug failure. These are little adapters that screw into the plug hole, and then the plug screws into them. Seems that they do provide a shield around the plug tips. Since putting them in my Kohler twin, I noted a distinct dropoff in max power it would make. It ran smooth, but wouldn't make the normal max power. So, questions: 1. Is it unusual for there to be a power drop when using these? 2. Doesn't the use of these effectively change the heat range of the plugs? Seems it would make 'em run cooler since the plug tips are moved away from piston TDC. Thoughts and comments appreciated.