Is this a good deal?

[f4iracer]

http://cgi.ebay.com/ebaymotors/TRX-400EX-85mm-12-1-JE-Piston-Hotcam-Power-Up-Kit-/320525286613?pt=Motors_ATV_Parts_Accessories&hash=item4aa0cbbcd5

looks like about everything i would need to ad some thump to the beast.

[supertrooper90]

your gonna need to run race gas and get some heavy duty head studs with the 12:1 compression. It doesnt say what kind of gaskets come with it either. I think you need an mls type of head gasket I would save up some $ and buy quality gaskets and stay away from the 12:1 comp. but it also depends on what kind of riding you do.

[f4iracer]

i don't need hd studs for a 12:1 compression stock bore do i ?

it comes with cometic gaskets i believe and they should be just fine.

what about this kit

http://cgi.ebay.com/ebaymotors/HONDA-TRX-400EX-TRX400EX-PISTON-KIT-TOP-END-GASKETS-/140465967923?pt=Motors_ATV_Parts_Accessories&hash=item20b46c9333

[Pipeless416]

Originally posted by f4iracer
i don't need hd studs for a 12:1 compression stock bore do i ?

it comes with cometic gaskets i believe and they should be just fine.

what about this kit

http://cgi.ebay.com/ebaymotors/HONDA-TRX-400EX-TRX400EX-PISTON-KIT-TOP-END-GASKETS-/140465967923?pt=Motors_ATV_Parts_Accessories&hash=item20b46c9333

that would definitely be pushing it. i pulled a stud on an 11:1 setup. the bore does affect the chances of your head studs pulling only because bigger bores cause more heat. it is mostly dependent on the compression you are running. 12:1 is up there. also, are you sure you're cylinder is still in round? a 2007 is not old, but depending on how many hours it has on it, it could very well be time to clean up the bore. i would hate to see you put in a new piston, only to start smoking 6 months later.

[f4iracer]

It's a year riden on it. I think the cylinder is fine. I suppose i should just go with a 416 11:1 then eh?

[PaRedneckRiders]

Originally posted by f4iracer
It's a year riden on it. I think the cylinder is fine. I suppose i should just go with a 416 11:1 then eh?
It doesnt matter if the cylinder is brand new with a high comp piston u run the risk of pulling head studs, which the EX is know for if u run high comp

I run 11:1 and dont have the HD head studs but if i go to 12:1 or 12.5:1 (which i plan on it the future) i will deff go for the HD studs

Its just cheap insurance against a leaky head gasket and having to take it apart later to fix it

[f4iracer]

11:1 isn't too bad and i thought 12:1 would still handle it but i guess not.

The z400's and stuff are 11:1 stock and their studs don't look like much either. course that's a liquid cooled beast.

[PaRedneckRiders]

Originally posted by f4iracer
11:1 isn't too bad and i thought 12:1 would still handle it but i guess not.

The z400's and stuff are 11:1 stock and their studs don't look like much either. course that's a liquid cooled beast.
Ya the z is a completely different motor
11:1 isnt much, the stock studs could prob hold it but for the 60 some $ it is to get them from GTT its cheap insurance

heres a link to there site and the head studs
http://www.gtthunder.com/Product/01-001.htm

[bkelley]

Originally posted by f4iracer
i don't need hd studs for a 12:1 compression stock bore do i ?

it comes with cometic gaskets i believe and they should be just fine.

what about this kit

http://cgi.ebay.com/ebaymotors/HONDA-TRX-400EX-TRX400EX-PISTON-KIT-TOP-END-GASKETS-/140465967923?pt=Motors_ATV_Parts_Accessories&hash=item20b46c9333 Stay away from Namura. Go with Wiseco or JE.

[Pipeless416]

Originally posted by bkelley
Stay away from Namura. Go with Wiseco or JE.

can't believe i didn't see that before.. good save :p

[Ian400ex]

If someone else didn't already say it, liquid cooled engines deal with compression better also.

[trailrider894]

yeah for sure go out to a 416, its only and extra 65 bucks or so for the bore and hone... it would be so worth it. Do the HD studs and if you get a 12:1 you should probably get a bigger oil cooler, tank, or spal fan. Or all three?? lol