Header Grinding

[Benrod327]

How far down do I grind down the weld on my header I don't want the weld to break I'm not sure how far is too far?

[pookiebear]

I ran mine down so the opening was same diameter as the pipe. On a 94 dr350.

[lowercasee]

I ran mine down so the opening was same diameter as the pipe. On a 94 dr350.

Ditto.

[mxrob]

Yep, basically you want a straight shot down the ID of the pipe. No humpy bumps for the exhaust gases to negotiate and cause turbulence. Just don't get too wild with the carbide grinding bit! I like using rounded end bits so there is no chance of cutting a sharp groove on the pipe interior anywhere when the weld is down close to the actual pipe ID. A sharp edge is where the pipe will want to crack. As long as you don't cut into the pipe wall thickness you will be fine. Just be cautious as you approach the actual pipe..... and, of course, don't make the flange sealing surface any narrower.

[Benrod327]

Thanks for the info guys!

[DoubleD650]

Yup,,,,Smooooooth.........

[dirtnsnoryder700]

Is the difference before and after that noticible?

[SD_Frontier]

will i have to rejet after this?

[lowercasee]

/\ Depending on what else is done to your bike, you may need to re-jet as well as adjust the fuel screw.

[NordieBoy]

Yup,,,,Smooooooth.........

Smooth but fuzzy at the same time...