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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?
 

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38 pilot and a 148 to 152 main - personally, I would ditch the K&N filter and go with a stock, UNI or Twin-Air air filter. The K&N passes too much dirt, has to be cleaned and re-oiled frequenty and is only beneficial if you need the extra air flow provided at the very top end of the engine's performance. Otherwise it leads to premature engine wear and necessitates unnecessary engine service. If you install something other than the K&N filter, then jet at 38 and 148
 
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