I have a new KFX400 and took the spark arrester off my muffler and I like the way it sounds and I want to keep it out. The question I have is do I need to rejet or do anything different so I don't damage my motor. Its louder now and seems to have gained a little on the low end which I like but I was just wondering if I need to rejet. Thanks!

Aaron

 

probally not but do a plug check

 

I have done the spark arrestor removal on the 400 . Also remove that constricting baffle from infront of your snorkle and jet 150 main and shim .30 on your needle.