Hey all, ive recently purchased a 2002 400ex and have been looking into exhaust. I found just a tip on E-bay that goes onto the stock muffler and basically does the same thing as a pipe and costs 45 bucks. Im not really worried about power because it has eanough so i just wanna know if i should jet it before slapping that bad boy on. Please let me know what you think...

 

Hard to say slip ons dont usually give much power if any at all. So you may jet it and noting will happen but make your bike run bad. Slip ons ar good for a real good noise.

 

I assume you are talking about a new endcap for the stock muffler. If thats all you are adding without any air intake changes you can probably get away with not jetting.

 

It will be just like taking out the baffle but without the good, shiny look. You dont have to re-jet if you take it out. With the baffle out the hole is bigger than with the new end and is loud. The new end cap will be a smaller hole and not as loud but still loud.

 

Allright thanks, I just wanted to make sure that it would be bad for the engine. I know 400ex engines are about the most rock solid 4 stroke out there, but im parnoid because I use to have a Scrambler 400 2-stroke which i blew up because of the wrong main jet (god damn you local parts dealer). Anyway, thanks

 

Dont you mean good for the engine????

 

Jetting

 

I have one of those. It helped the throttle response alot. My bike runs alot better with the White Bros. slip on but the Tip was worth the money. Ohh and They sound way better with that tip than with just the baffle removed. I went up a few main jet sizes with that tip, k&N and no airbox lid. Maybe you could try a 150MJ.