Hello, I recently bought an LRX 90. It starts right up and idles but will not "go". I did a basic tune up and am charging the battery as of this writing.Head gasket replaced as well. Lights work. Won't rev. PLEASE HELP !

 

Are you trying to rev up without filter mounted as pic shows. That will give a very lean condition. A good carb cleaning may be needed if bought not running right.

 

I agree, start with a carb cleaning. then a compression check.