bikerman32158, on 17 June 2012 - 04:32 AM, said:

Whats the fun or knowledge gained from sending it off?  I understand the principles but dont know when to stop or how much till its even worth it.

When I put the BB331 kit in my bike last year I investigated the port and polish of the head. Bill Blue does not do it but could send it out and have it done. It was a whole lot more money than I wanted to spend. I did already have the larger head pipe on my bike.

Since youve never done this kinda thing, and im guessing u can rebuild ur engine , pull the head , remove the exhaust valves, and without hitting the valve seats, ( if you hit the seats u will have to have new ones installed)  polish the whole exhaust port to a mirror finish. that will help alot.  I cant sit and explain the whole process,  porting requires unshrouding the valves ( removing metal) for better flow charateristics , and some reshaping of the port. the polish helps the exhaust leave the port quicker, for a better scavaging effect. Makes an engine more efficient. a klx 300 engine needs help on the exhaust side. Hope this helps. good luck.