i appreciate you taking the time to help me. can i still do the port job with the 426? what stage cam 1 or 2? i heard with the stage 2 you need to change the springs and valves and stuff. if the top end is off may as well change it huh? my buddy has got a bone stock z400 and i am so close to beating him but i cant. i want this to put me over the top!

 

yes you can still port and polish. Hotcams says they do not require hardened rockers and new springs but a lot of people recommend it. Hotcams also says that stage 2 is for big bore 440. I'd stick with the stage 1. You should gain a big hit in the mid range and some upper. stage 2 is mostly upper range power for cross country racing and what not.

 

stage one sounds good to me too. what is the process bore then port or port then bore.

 

I don't think it matters. I'd do the bore first. It will probably show you the biggest gain. If you plan to go with a cam you'll need a higher compression piston like 11:1. Anything above the 12.5:1 area and you'll have to run race gas.

Just remember your putting alot of money into this thing. Your taking a chance of being disappointed and wishing that you sold it and used the money to get a 450. I almost started the process your doing and forced myself to hold off a couple of months. I found a good deal on a yfz450 and picked it up. Theres no way i could get the power out of that 400ex that i'm getting out of this beast.

 

im just so comfortable on the bike i think its a good all around bike. at world class cycle they are giving me the piston etc. rev box, cam and gaskets for 269.99. i have a guy at my local shop that is going to put it back together for me atleast help me with it. i just have to find a local machinist hopefully an old tymer thats going to bore and port for a decent price. i can prob only get like 2500 for the bike anyway may as well hold on to it. i dont want a monthly note.

 

400ex's are bulletproof and the best trail quad you can get. When I use to ride lots of trails and i wouldn't of traded that ex for the world. If you are sure you wanna keep that EX (and you sound like you are) than go for it. You won't be disappointed at all if its what you want. That sounds like you got good prices. Just be sure its a high compression piston (probably is most are) or it won't make much difference and a cam will be out of the question.
Good luck and have fun with it.

 

i got a 440 big bore ported head but a stock pipe ive jetted the carb but after runnin a few minutes the exhaust pipe glows red comin right out the head please help