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Zeb400EX
02-03-2009, 12:46 AM
I going to make my ex a 416 and I am going to use a 400xr head gasket. I am wondering do I have to trim the fire ring on the gasket to fit the bigger bore on the cyl?
dariusld
02-03-2009, 03:42 AM
No, whats a fire ring?
rob_990
02-03-2009, 04:53 AM
i didnt do anything to my xr 400 head gasket when i put it in.
Zeb400EX
02-03-2009, 09:22 PM
Originally posted by dariusld
No, whats a fire ring?


I was talking about the gasket ring that seals the cyl. bore to the head. I just thought that since the bore on the cyl. is bigger maybe the gasket should be cut bigger too. But I guess not. thanks
Homerx
02-04-2009, 09:58 AM
Originally posted by Zeb400EX
I was talking about the gasket ring that seals the cyl. bore to the head. I just thought that since the bore on the cyl. is bigger maybe the gasket should be cut bigger too. But I guess not. thanks

I know Wiseco make a paticular head gasket for 87-88mm pistons so I think you may need to by and XR gasket for a .80 overbore, otherwise you fire ring will be exposed to combustion.
rob_990
02-04-2009, 01:08 PM
o. i didnt see that your putting it into a bigger bore.im not sure if you have to or not.
dariusld
02-04-2009, 04:38 PM
No ,I'm saying you don't have to. And if you do a search you will see others say you don't have to.
Homerx
02-05-2009, 08:15 AM
Far right column. ?
Colby@C&DRacing
02-05-2009, 09:01 AM
We have different bore sizes and thickness of 400ex gaskets custom cut for us and in stock all the time.
honda400ex2003
02-08-2009, 09:11 PM
I used a stock gasket from cometic when I did my 416. It has ran fine for six months. There are other posts around too that explain this. Steve