NH 650: what material for orings on oil pipe in cylinder head?

[PGWIN]

Hi I'm new here - amazing just found this after searching hi and low for NH forums for 3 months now!

My question is can nitrile o'rings withstand the temperatures of the oil pipes in teh cylinder head. 

I know the service temp of nitrile is up to ~ 275F but i think then cyclinder head may get to excess of 300F.  Not sure if the oil is cooled in this portion lowering it enough to use nitrile as a replacement (which i have on hand).

Does anyone know if nitrile can be used?  Is it commone to use nitrile in cylinder head of air cooled cycles?

Thanks,

Paul

[gammer]

Hi Paul and 
Got any pics of your bike? 

I'm not sure if the nitrile o'rings will work, as the cyl head on these bikes does get hotter then 300*F.
I'm not sure of the exact temps these engines reach, but I've heard its around 800*F. Again, don't quote me on that temp...its just what I've heard when shooting the breeze with other motorcyclists.

I know when I got my pipes powder coated, the guy was a little bit concerned that the hi temp powder coat would work because its only rated for 1000-1100*F. So far I've had no issues with heat on them.

[PGWIN]

Thanks.

I guess this time i better just go and get the Viton orings and will refrain from the temptatoin to put in nitrile of which i allready have.

Uhhh those orings are so hard to find because they are JIS (japan industrial standard) metric sizes and the only place i've seen them before is in a complete kit for $90.   

I"ll post some pictures after i get it back together - right now it wouldn't look very nice.

Thanks - hey and this is cool that there is a technical sight for CB's - likely most of my posts will be there.