i'm trying to find out which year cr head gasket i can buy to fit my 89 trx 250r. i know it can be done can someone help. need my compresson. all the dealers around me told me they never heard of doing this. i told them when i find out i might tell then. probly not!!!! thanks kevin

 

I can't remember what year it is from but, call Nac's Racing,I know they list It in their Catalog
They can tell you the honda part# ,and should have it in stock

AMJ

 

The head gasket from the 86-87 use's the paper type head gasket instead of the metal gasket for the 88-89. The ATC 85-86 is the same as the 86-87 gaskets.

 

I put the metal CR250 gasket in my 86 R, and I am only getting 150 psig compression on a fresh top end (well broken in now) when I was expecting around 175, could this be why? it runs fine otherwise.

Rod 86 250R

 

I have heard that 89 will work

I just saw that TRX250R87 (replyed to your post on Mac Dizzy) said 89 will work also.

 

Yes the 89 CR gasket will work. You can also buy a 3-part TRX gasket and drill out the 2 small holes so that the gasket comes apart. Now you can use the 2 thin parts as 2 gaskets. To make them seal better spray both sides a couple of times with Permatex liquid copper in a can.
I would think that your compression should be around 180psi.
I am running this setup right now with 2 base gaskets and a 21cc coolhead adn have about 185psi.
ERIC
aka TRX250R87

 

thanks guys for the input. nacs racing has a great site for 250r's gota check it out. i have taken apart a 3 piece gasket and used the two outer gaskets and had a psi of 210.

.50 over bore
my own port job
rad valve
38 carb
fmf pipe

thanks again kevin

 

Here's the Honda part number for the CR head gasket #12254-KZ-000

AMJ

 

If you run 185 or 210psi, do you need high octane fuel? Or will pump gas work fine?

 

For a stock engine (other than boosting compression) i do not think you want to go far over 180 or you might have to use at least a mix of race and pump