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b400ex
03-26-2005, 12:20 PM
Is buying an 11:1 compression for my 400 worth it? I plan on getting a HMF and can't afford a 440 kit. Thanks
b400ex
03-26-2005, 12:27 PM
*wiseco compression piston*
nosliw
03-26-2005, 12:28 PM
your going with a stock bore 11:1?
400EX QUADER
03-26-2005, 02:35 PM
Do a 416 with it then it would be more worth it.;)
catch22blaster
03-26-2005, 05:45 PM
i hear alot of 416 are very reliable my friend ran like 50 races with it with no problem
400exrider707
03-26-2005, 10:16 PM
Originally posted by catch22blaster
i hear alot of 416 are very reliable my friend ran like 50 races with it with no problem

Well I'm sure it is but common sense will tell you the thicker the cylinder wall the more reliable it will be. The stock bore 11:1 is a big improvement over stock and is really reliable. A cam would compliment it as well.
cals400ex
03-27-2005, 04:12 PM
if you don't want to get a cam, i wouldn't get a piston, a stock bore high compression piston with a drop in cam can make a significant difference. you do not have to get a 440 so don't worry about that.
300ex_honda
03-28-2005, 08:05 AM
i am going to upgrade to a 416, or posssily 426, but what all do i need, i am going to go with wiseco high compression piston, do i need a new cam? and what else?
400ex28
03-28-2005, 09:26 AM
Originally posted by 300ex_honda
i am going to upgrade to a 416, or posssily 426, but what all do i need, i am going to go with wiseco high compression piston, do i need a new cam? and what else?

you need high compression piston, new aftermarket cam, rev box, you can also do more stuff my like porting and polishing but that will cost you a little more, with certain cams you will need to get new stiffer valve springs...
400exrider707
03-28-2005, 12:06 PM
Originally posted by 400ex28
you need high compression piston, new aftermarket cam, rev box, you can also do more stuff my like porting and polishing but that will cost you a little more, with certain cams you will need to get new stiffer valve springs...
Certain cams also require hardfaced rockers as well. Personally I would stay away from the 426 unless you plan on having it resleeved as well. If you must bore, do a 416.
400ex28
03-28-2005, 12:10 PM
Originally posted by 400exrider707
Certain cams also require hardfaced rockers as well. Personally I would stay away from the 426 unless you plan on having it resleeved as well. If you must bore, do a 416.

yea, i would do a 416 also dont forget to put new gaskets in!