400ex jetting with sparks pipe?

[exsweetie66]

Just curious on if anyone has a 400ex with a sparks X6 exhaust, uni air filter and stock piston, what jetting do you run? we're having trouble getting it tuned in and really do not want to take it in and pay for it to be jetted when we know how to do it just not sure what the sizes should be.
an answer would be really appreciated. :)
thx.

[mooseracerX]

I'm not sure if you've saw these or tried these but here's some
http://www.sparksracing.com/page.asp/csasp/DepartmentID.173/cs/SectionID.933/cs/PageID.5396/csasp.html
http://www.sparksracing.com/page.asp/csasp/DepartmentID.173/cs/SectionID.933/cs/PageID.3345/csasp.html
Hopefully they helped some or at least get you to a good starting point.

[REPOMAN]

if all else fails call curtis sparks and talk to tech support they are very elpful.

[HondaRaceReady]

You're really not supposed to put the X6 on a bike without a high compression piston or big bore or both. It wont give you enough back pressure and you'll burn your exhaust valves. Either return that and get the X4 system, or upgrade the engine. Thats the only bad thing about sparks pipes, is that they're built specifically for a certain type of engine and can't be adjusted.

[exsweetie66]

well im getting ready to put a 416cc kit and i high compression je piston kit in it but i was wanting to ride it before i get the money for it.