Discussion Starter · #1 ·
I recently decided to revive my old 400ex. One of the many tasks involved was cleaning the carb. I used to run a slip on muffler and k&n filter and had jetted the carb along with it. Its been so long I don't remember what jet was in it and I forgot to look when I had everything apart. I decided to put the stock muffler on to keep it quiet and clean since the aftermarket was rusting. While riding this weekend I noticed the power of the machine was inconsistent so I decided to order a rebuild kit and give it a shot. Anyway, what jet set would you recommend for just a stock muffler and k&n filter?