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Head Pipe
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Posted by: FoxMxRiders

I read somewhere that I can do a modification to my 400ex headpipe to flow better by grinding somethings ... Can someone can show me pictures and explain to me how to do this modification?!?

I know that is better to buy a aftermarket one but sometime I need to put my stock pipe then I want to keep the stock headpipe

Thanks

Posted by: EXracer83

Take the headpipe off and grind the welds inside of the part that goes into the cylinder head. I haven't done it yet, just read about it on here but I am about to get to work on it.

Posted by: FoxMxRiders

Someone have a picture of the welds?!? I want to know exactly what to grind

Posted by: FoxMxRiders

I need this information for tommorow guys because I will work on my bike then someone post a pics of the welds that I need to grind plz

Posted by: FoxMxRiders

UP !!! I need this information plz

Posted by: 400exrider707

Ok just unbolt your stock headpipe off of the engine. Look down into the headpipe. You will see a bead of weld on the inside of the headpipe. Take a dremel and grind it right down so that the inside of the headpipe looks smooth. Bolt it back on. Your done! I did this myself (sorry no pics) and didn't notice a difference at all.

Posted by: FoxMxRiders

you said that you don't have seen a difference them do this mod is a lost of time?!?

Posted by: 400exrider707

Well I had my headpipe off already to do other work, so it wasn't too much of a waste of time for me, plus I think I could have grinded off a little more of the weld, but its up to you man. Some people say they notice a difference, but I think it might just be in their heads. Only one way to find out bud.......get grindin.....

Posted by: JOEX

http://www.exriders.com/vbb/showthr...&threadid=37901

Posted by: 400exrider707

Thanks JOEX thats what I was lookin for