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View Full Version : grind welds...grind welds


400redneck
02-23-2003, 10:34 PM
I keep seeing ya'll talk about grinding the welds on the stock head pipe. what welds are ya'll talkin' bout?
mysticfalcon
02-23-2003, 10:43 PM
If you take the headpipe off you will see some pretty big welds inside teh headpipe where it mounts to the head. Mine were prety big on my old 400. I did a few other things at the same time so im not sure what i gained from it but every little bit helps.
Steve-o 400EX
02-24-2003, 09:02 AM
yea the welds are inside the headpipe about a half inch in. the go all the way around. I just used a dremel tool and smoothed em out. Mine prolly stuck out like 1/8 or 3/16 of an inch all the way around. its really easy and takes like 20 minutes to do. the hardest part is gettin the header off.
hondaforlife
02-24-2003, 09:41 AM
One of the welds on my headpipe was like an 1/8 inch in diameter smaller on one side than it was on the other. I had my grandpa's machine shop port my pipe out for me and I noticed that the engine revved up faster.
DirtDiggler
02-24-2003, 10:36 AM
does anyone have any pics? I would like to do this but with my non-mechanicalness I don't want to mangle anything.
JOEX
02-24-2003, 12:28 PM
Not the best pics but I haven't seen any others...
http://exriders.com/vbb/showthread.php?s=&threadid=37901&highlight=header+welds

Joe
DirtDiggler
02-24-2003, 12:51 PM
thanx
tryken
02-24-2003, 02:56 PM
Is there any seals or anything that would need to be replaced if you took your headpipes off?
zephead400ex
02-24-2003, 04:19 PM
Originally posted by tryken
Is there any seals or anything that would need to be replaced if you took your headpipes off?
No seals to contend with. Might want to put anit-seize on the header bolts when you install them again.
tryken
02-24-2003, 04:21 PM
Cool, thanks.
JOEX
02-24-2003, 06:54 PM
Originally posted by tryken
Is there any seals or anything that would need to be replaced if you took your headpipes off?
Some quads have them some don't. Mine didn't but my friends did.
They are metal "O-Rings" I got some from Service Honda and put them on mine.

Joe
ridered03
02-24-2003, 07:19 PM
will that make enough difference to mess with the jetting???
JOEX
02-24-2003, 07:27 PM
No.
400redneck
02-25-2003, 06:24 PM
I have a 400ex with a k&n and a miled jet. I agree with the idea that the air flow should be smooth but I also agree that maby we should leave the designing to the experts.

thanks a bunce.....

400ex + tree = broken femour (11/29/02)
DirtDiggler
02-25-2003, 07:31 PM
the experts will lower your power output for saftey and emissions.
Steve-o 400EX
02-26-2003, 08:46 AM
Originally posted by DirtDiggler
the experts will lower your power output for saftey and emissions.

True that. The experts suck. I like being my own expert.:confused: :devious: :uhoh: :bandit: