About 90% of the time the low speed needle never has to be touched and when it does usually only once for the life of the engine. The tune is done with the HSN as the primary target for the running functions. The whole set up is based aroung that HSN and when it runs the best it can without being to lean and if there is still a problem then you look to your LSN and idle stop needle. Take a look [link=http://www.xtm-dealer.com/breakin.html]HERE[/link] there may be some usefull information there for you
