need help!! 87mm head gasket

[eotrx400ex]

why can't i find a top end kit for 87mm bore??? found 86mm on ebay... i only really need the head gasket but after finding out COMETIC was gonna cost $37 shipped:eek2: just for that one gasket i canceled to see if i could just get another topend kit for around that.
does anyone know where i can go with out having to resort to that much for one.. rocky mountain atv only carry std. bore
:ermm: and couldn't fing anything but 89mm (440) from chapparal

[honda400ex2003]

you could use a stock bore one on the 416 if need be. go to honda and buy one if that is all you need. they should be able to get you one in a day or so or have one in stock for them. otherwise c&d racing or gt thunder will have the 87mm gaskets but i am sure you will be paying that much no matter what kit you buy. steve

[eotrx400ex]

i don't mind paying that much for a kit... but the $37 was just for 1 just the head gasket... really are you sure a stock size head gasket will work?? i have one..and 85.75 is what the bore is for it. don't see how a 87mm bore will work.. with out maybe causing some issue:confused:

[CJM]

http://www.cometic.com/powersports.aspx select what you need in the dropboxes, they got it.

[honda400ex2003]

Originally posted by eotrx400ex
i don't mind paying that much for a kit... but the $37 was just for 1 just the head gasket... really are you sure a stock size head gasket will work?? i have one..and 85.75 is what the bore is for it. don't see how a 87mm bore will work.. with out maybe causing some issue:confused:
it will work fine the 1 mm on each side will not make a difference. i have ran an 85mm gasket in mine for 2+yrs. the piston does not go up that high in the bore anyway so it will never hit the gasket material. steve

[eotrx400ex]

i see. i was wondering more about during combustion/compression stroke an if it wouldn't be as efficient...does that make sense?

[honda400ex2003]

It really doesnt make much difference in the engine as far as i can tell. there are quite a few guys with stock gaskets that have had good luck with them for quite some time. steve

[eotrx400ex]

cool. i remeasured the gasket i have and its more around 86.35mm. i'm gonna go with your suggestion. thanks :D

[honda400ex2003]

no prob you shouldnt have any issues with it unless the gasket fails from other reasons. it wont fail from being that size though lol. steve

[jdog75]

im curently running the 89mm headgasket and it works fine. I picked up a complete motor gasket kit for $35 shipped on ebay.

[Kentang4]

I used an 86mm head gasket on my 87mm 416 build and it seems to be working fine. Mine was a metal cometic 3 piece gasket and I was able to carefully enlarge it to match the bore size using a dremel tool. There is a rolled portion on the gasket that is the crush area for making the seal, just leave a little material inside of that and you should be fine.

[eotrx400ex]

Originally posted by Kentang4
I used an 86mm head gasket on my 87mm 416 build and it seems to be working fine. Mine was a metal cometic 3 piece gasket and I was able to carefully enlarge it to match the bore size using a dremel tool. There is a rolled portion on the gasket that is the crush area for making the seal, just leave a little material inside of that and you should be fine. i thought about trimming some out of the one i have but wasn't sure...have any pictures showing the crush area you are refering to?

[Kentang4]

No, afraid I threw the old one away and the new one is installed. If you look at the gasket though, there is a circular ridge stamped into the metal just a bit inboard of the inner edge of the gasket. It goes all of the way around and makes a complete circle that is just a bit larger than the 86mm opening in the gasket. I'm guessing here but I'd say it's set back from the edge about 1/4". What I remember doing is removing about half of the material between the inner edge and the rolled crush area. That worked out almost perfect. The rolled portion actually gives you a good visual reference point when removing the material. I didn't mark my gasket at all, just reference the roll and make it even all the way around. With a few test fits you will have it in no time. Good luck.

[eotrx400ex]

thanks bro. that were i was thinking