400ex 416 piston compression question

[nowukno]

I am going to purchase a 416 wiseco piston kit with stage 2 hotcam , i was wondering should i get the 10:1 or 11:1 compression , i would rather have the higher compression ofcourse but i dont wanna run race gas or 50/50 , so how much power would i lose if i went with a 10:1 or maybe i was given false info about the type of gas to use with 11:1 , please help me , by the way i have a 2005 400ex with pro circuit full system , k&n with outerwear (no air box lid) , stage 2 dyno jet kit and a rev box.

[400exredrider]

get the 11:1 you can run pump gas on 11:1 as long as is 93 weisco compression isnt true anyhow,.,, id go with a JE 10.8:1 with XR400 gaskets

[nowukno]

Originally posted by 400exredrider
get the 11:1 you can run pump gas on 11:1 as long as is 93


But i have heard some complaints about pinging noise when you run pump gas with 11:1

[400EX QUADER]

Just get the je and sometimes you do need to mix in 50/50 or less but won't having alot more power be worth it?Even with the je it will ping sometimes.My friends did.Just don't get wiseco if possible and defently not 10:1 unless you want stock power.;) :cool:

[nowukno]

Originally posted by 400EX QUADER
Just get the je and sometimes you do need to mix in 50/50 or less but won't having alot more power be worth it?Even with the je it will ping sometimes.My friends did.Just don't get wiseco if possible and defently not 10:1 unless you want stock power.;) :cool:


But i live in a very remote area and its would be difficult to obtain race gas everytime i ride (every weekend).

[400EX QUADER]

Just mix 1/4+ racegas then.It should bump up the octane to like 97+.

[400EX QUADER]

That way buy like 5-10 gallons a month of racegas when you go into town(depending on how much u burn).;)

[nowukno]

Originally posted by 400EX QUADER
Just mix 1/4+ racegas then.It should bump up the octane to like 97+.


I think there is a place not to far away that sells 100 octane , could i use that straight into the Quad with no mixing and how much does it usually cost per gallon?

[400exrider26]

why do you say to get the je instead of the wiseco? i am also thinking about a piston and i want to now all i can before i go with one... thanks

[Rico]

JE 10.8:1 piston runs fine on 93 octane. I do it all the time.

[400EX QUADER]

Just the je's are more reliable and my engine builder won't even put in a wiseco.Ask some guys like cals400ex or rico and i'm sure they will tell you the same thing.

[nowukno]

Ok , i am going to get the 416 kit with a je or ross piston 10:8:1 and stage 2 hotcam , will it be ok to run 100 octane , also how much does the stuff cost , i know ive asked before but i never got a reply - thanks

[nowukno]

I guess no one knows:confused:

[400EX QUADER]

Yes 100 octane is perfect.;) You can prolly find the cam for around $100-125 but the stage 2 is actually the new stage 3.So just make it's the new stage 3.

[400exrider707]

You can run 93 on any of those compressions you listed.

[cals400ex]

side by side, the je and the ross are very similar. i actually run a thermally coated ross and i purchased the light piston pin also. the reason why i choose the ross over the je is because it is lighter. you will be able to run on pump gas just fine probably.

[enduro400rider]

Originally posted by nowukno
I think there is a place not to far away that sells 100 octane , could i use that straight into the Quad with no mixing and how much does it usually cost per gallon?

the 101 octane here goes for about $7 or $8 and close to $10 on the nights the drag stip is open

[TRXoutlaw51]

100 octane in Jersey is bout $5.25... figure it to be around there.. and thanks to all the other guys for the info.. I was considering the weisco 440 kit.. But no more.. I'm goin with the ROSS..

[sloppyjoe]

i just bought a whole 55gl. drum of 114 for $220.00. thats the best way to buy the stuff.