which one?

[707trx250r]

I was wonderring what year atc and cr 250r head gasgets I need to run to change my compression.
And do they bolt on or need to be trimmed?

Thanks for the help :cool:

[Rich250RRacer]

Wha compression do you want? An 85-86 ATC head gasket will give you a little bump in compression, or you can take apart any of the 250R gaskets and get basically the same result as running an 89-91 CR gasket.