what to do....

[Tommy 17]

i want to buy a 416 kit and i want to use a j-e piston and i don't wanna have to run more then 94 octane gas.... i already have a xr400 cam and i was wondering what i should do i don't want this to cost over 500 but i want sumtin that wil make a huge differnce. i am totaly lost what to do.. should i do port work i have no idea what to do...plz help out guyz. thanks

[oynot400]

Getting the head ported and polised in well worth it. If you alread have the cam and you are tearing it down I would do it.
I was concerned about running race gas when I did mine. So I put in the 10.5:1 piston in. I do run race gas when I am racing and it makes a real difference. Even a mixture of 50/50 race gas and 93 octane makes a differnce, that is what I have been doing for my other riding.
As far as the cost,my 440 kit cost $265 plus $85 to have the sleeve installed and $120 for porting and polishing. Which comes to a grand total of $470, which would fit in you $500 budget. :D

[Tommy 17]

How much does a 416 kit cost put into the bike is it 155 or is that just the kit.... i want je 10.5:1... what kinda valve job should i get done too....

not to positive but if you get the 11.5 to 1 and use a 400ex head gasket it would actually be 11.3 to on so i don't know i you run the xr gasket to keep it the same but if you do run the 400ex one you might wanna get 11.8to one or so..

[kat400ex]

416 is the way to go.....JE 10-8 to1 is high as you can go on pump gas thats what i got and if you want to run race gas you can.......porting and polishing i heard are great if you buy the head pipe too! ......Terry Marcum sells the 416 kit.....if you already have the xr 400 cam all it will cost you is like 155........some where in that area the best thing to do is email terry....marcumsatvs@hotmail.com.......his website seems tobe acting up some but i know him personally and i am totally impressed with my 416 havent fully broke it in but wow so far its awesome......all they do is bore it 80 over ......no sleeve or nothing no valve work.....i had my valve seals replaced with new ones and also had vortex baskett and barnett clutches installed....big power difference.good luck.....and marcums is our sponsor here at exriders.com so i think you get some type of discount too.....email him he will get back with by tomorrow morning ......

kat..does the 155 dollar kit include everything like piston and all plus boring...also i was thinking of buying a wb all around cam..does this setup sound good or shouldi get the xr cam and how much is the xr cam

[kat400ex]

i like my set up alot.......xr cam has alot of duration and alot of lift...the 155 includes the piston and boring .....and if you get it from terry you should get some type of discount too please dont hold me to nothing i sure dont want to piss terry off.....but i am totally satisfied and hey yall want to improve motor do your clutch basket.....wow .......marcumsatvs@hotmail.com is his email he usually checks it in the morning.....he is good about responding....personal friend of mine i was there today and got to go back tomorrow to get bigger jet.....good luck..

[kat400ex]

to be totally honest i dont know how much the cam is because i was gonna put it in later.....money you know....so anyways long story short he put it in for us and were gonna tear his bike down to the frame and paint it for him for cam......little trade thing....which is great......so i dont have price but i am wanting to say 130 or 140 get with terry .....he will give you a price.....later

I am wondering if the wb all around cam is a good choice to do but is it better than the xr

[FlyinRed]

The XR400 s 120 give or take a few. I did it and it rocks (see post xr400 cam update).