About a 300EX piston?

[ROWDY]

As I put a compression gauge on my 300EX, I have 210 of pressure. What compression ratio piston would that be?

[miniquaddad90]

sounds like a 10:1. Stock is 178psi if I recall it correctly and stock pistons were in the 9:1 ish range

[ROWDY]

sounds like a 10:1. Stock is 178psi if I recall it correctly and stock pistons were in the 9:1 ish range

From Clymer;
- TRX250X 9.4:1
- TRX300EX 8.9:1
- 170.8 - 199.2 PSI (Does not state for the 250 or the 300)

So I'm trying to name that piston without a tear down.