I have a 92 LT250R & there's a valve on the left side of the engine beside the pipe that looks like the oil cap & it reads 125 above it & 0 below it. I believe its some sort of exhaust regulator? DOES ANYONE KNOW WHAT ITS FOR???
& WHICH WAY IT SHOULD BE POINTED??

 

This is the suzuki power valve or exhaust valve. If you bike is runnig right dont touch move the settings. Go to this link for more info. this will explain what this valve does

http://www.webspan.net/~rpfirley/pwrvalve.htm