what should i do?

[spud400ex]

i want to make my 400ex faster but i don't have much money. is there any way i can modify the stock pipe to make it faster. i will probably get an k&n airfilter and jets to help out more. any other cheap mods would be helpful.

[sparks400ex101]

you can grind out the welds on the head pipe, and romove the choke, adjust the slack in your thumb throttle, and if you want it to handle better flip the front rims

[wilkin250r]

Have you tried riding downhill?:blah

[sparks400ex101]

lol you can always get a little more top end down hill:D

[spud400ex]

smart @$$. by the way what do you guys think of airbox vents.

[JOEX]

Grind header welds...
http://www.exriders.com/vbb/showthread.php?s=&threadid=37901

Aftermarket airfilter...K&N...UNI...and others.

Jets to match filter and exhaust....Don't buy the "Jet Kit" Buy the individual jets that you need. Search the powertrain forum for info on what jets you might need....

Remove the choke...again, search the forum...

Adjust the gearing via sprockets...

Airbox mods are OK if the exhaust has somewhere to go.

Joe

[hondaboy400ex]

were are the welds at that u should grind off ive been doing that and know i just wanted to know post pics if u can thanks

[Steve-o 400EX]

They are in about a half inch inside each header. U can fell em with ur finger.

[daiglea]

What do you guys use to grind those weld's out to do a better job. whould just sand paper do?

[KAWSAM62]

a dremel tool or a die grinder with a burr bit just grind the welds smooth then polish with a sanding roll hope this helps good luck:cool:

[spud400ex]

after i grind down the welds on the pipe should i rejet the carb or should i wait till i get an airfilter to rejet.

[JOEX]

I'd wait for the filter...I don't feel the header mod changes the flow enough, if any, to warrant a jet change.

Joe

[JOEX]

You also might want to consider a UNI filter...they are less expensive and have a good reputation.

Joe

[RideRed04]

There is a way to modify the stock exaust, should be a review on it put up soon.

[spud400ex]

which wuold be better k&n or uni airfilter and what would be the best size of jet to us with it.

[spud400ex]

BUMP!!!!!!!!!!!!

[02 Red Rider]

Originally posted by spud400ex
which wuold be better k&n or uni airfilter and what would be the best size of jet to us with it.

What kind of riding do you do and in what conditions? I prefer the K&N w/ Outerwear.

[spud400ex]

i ride mainly in open feilds but occassionally(sp) go woods riding and mudding. i was thinking of getting an outerwares airbox lid and a k&n with outerware cover.

[spud400ex]

bump

[ATV_MAN]

Id start by a new filter and no airbox lid or airbox mods..then u can chnage ur gearing around the way u want it...i wouldnt grind the welds,remove the choke,or do anything to the stock pipe .