what kind of bike you have, i know NGK makes capless plugs for both my yamaha's.... btw a good way to clean a plug when its fouled on a dirtbike, is blast it with some carb cleaner and while its still soaked, light here up.... can be a little dangerous, but it does a hell of a job.... trick has saved me once or twice out in the middle of the desert..... luckily i keep a can in my backpack with my other couple tools i keep....btw generally if everything is mechanically sound on a two stroke bike, the reason the plugs get fouled is from choking it for too long....other than that your carb might need a rebuild or you're mixing too much oil into your fuel.....