13.1 Piston

[MR.BIG]

I was wondering if I install a 13.1 piston with my hrc cam would I have to run higher octane than 93?

[Colby@C&DRacing]

you should be able to run 93 you might have some trouble when it is really hot out and it also depends on your elevation. We run a 13:1 thermal coated piston on 93 octane.

[MR.BIG]

The thermal coating makes it run cooler but do have a problem with the coating peeling after time. Can you PM me a price for that piston. Who makes the piston?

[honduh440]

i wouldnt run 93 on a 13.1 compression

[Colby@C&DRacing]

Originally posted by MR.BIG
The thermal coating makes it run cooler but do have a problem with the coating peeling after time. Can you PM me a price for that piston. Who makes the piston?

we have lots of hrs on 2 thermal coated pistons The first thermal coated piston saved our 450 at the 6 hrs in Texas when we got home I drained the radiator and the only thing it had in it was oil I tore the motor apart and the piston looked pretty good. I did go ahead a replace it. I am going to tear the bike down again pretty soon and see how this one looks :) The thermal coat does not come off the pistons look the same as when they were installed. The piston is JE $150 and thermal coat $45

[MR.BIG]

Thanks for the info I will be ordering one real soon!