just picked up a 400 express and bored it 20 over and would like to find some specs on porting it i`m in the works of getting head shaved and shaped but i would like to port it myself thanx

 

You can use the same porting specs as what is used for the 400 Scrambler. I am sure someone here will have that.

Farmr

 

If nothing else just smooth out the castings on the exhaust and polish the head and put in some good reeds.

 

thanx guys i will look in to this cause i want to see this beat my 500 ho so i can have some fun

 

Hey my 400 set up the way it is will out do a 500 HO .

 

hey any one have some before and after pics on there port jobs?

ftwflh my buddy has a 400 explorer and we put a 180 main jet and thats it now i have a hell of a time pulling away from him till we hit top speed i use to be able to walk all over him like it was nothing his is stock even the tires (bald) mine has k&n filter new spring and bear claw tires on my 02 500 HO plus i must have 80lb on him. now my 400 is 20 over head just bean reshaped,shaved,polished polaris piston tsl vampire tires and i wll get some reeds so i hope it goes good when i get it together

 

That 180 jet sounds a little on the lean side.I run a 260 on my 400 but it is piped.Stock is either 200 or 210.

 

i hear that is what they run up here my 400 has 190 main and just got back together today will take it for a rip soon 200ft is not enough as far as the porting i lowered my intakes abit and polished my exhaust head was done looks like a mirror just need the time to ride it now thanx for the info guys