do i need race gas with this?

[Ryan.]

do i need to run race gas with a weisco 12:1 compression ratio piston for a 350x?:confused:

[mdunn]

Well, you didn't mention what ATV, but if you are running 12:1 CR, then you should run either race gas or mix race gas with premium to keep the detonantion down. if not, you will be changing, that 12:1 piston one way or another.

[Ryan.]

Well, you didn't mention what ATV, but if you are running 12:1 CR, then you should run either race gas or mix race gas with premium to keep the detonantion down. if not, you will be changing, that 12:1 piston one way or another.
its a 1985 atc350x

[badasskfx]

you need to mix 50 50 for anything over 11:1

[Ryan.]

you need to mix 50 50 for anything over 11:1what do you mean 50 50?

[NOS_350X]

New 450's run 12:1 stock and they recomend 91/preimum. Its not optimum but i have see many people on x's run regular gas on a 12:1 engine. I woudnt recomend it but you can do it and probably not have any problems.

[badasskfx]

50% 93 50% race fuel. other wise you will have detnation
i would not go by what the 450's run.....why do you think they have a fairley high rate of engine failures.

[maggiesboy]

from the mouth of famed engine builder Jack Moore, do a compression test 1st.

up to 195 = pump fuel or premium
195- 215 = 50 / 50 pump fuel and 110
215 and up = straight 110 or higher