Originally posted by: Mr. Exceptional
Ok, I just removed the baffle from my 400EX. I know it will make it louder. But some people have told me that it will increase its power, and others have said that it will decrease its power. Either way, I am getting a slip-on muffler soon so it doesn't really matter. But I would like to know what would happen if I left it like that for a while.
More than likely it will decrease your power. You are probably not jetted for a less restricitive exhaust. Straight from the factory you probably are jetted a little on the rich side (runs cooler and less chance for a melt down - safety zone for the factory warranty claims).
Probably not too much will happen if you take it easy but I would definately check my sparkplug and if it look too light or gets white expect a melt down or you can choke it a little to make it more rich. If it stays dark then you are ok. You gain nothing by removing the baffle without rejetting.