309 kit

[300ex_rida]

Do you have to use race gas with a 309 kit for a 300ex? And also will that give it alot of power?

[TRX_Thumper]

you could bore an stroke your motor to a 406 and not have 2 use race gas.....or you might have 2....just depends on how high you go with compression

[Buzzsaw]

if you go to a 12:1 but, a 309 is maybe a 10:1 you can run 93

[Nausty]

the only things that effect compression ratio is the stroke and piston although you may want to run race gas to help the machine burn cooler.

[stocktires]

like nausty said, it'll make ur quad run cooler.
but then race gas is really expensive, and you'll have to re-jet (jet up) with race gas, so you'll be useing more gas.
If I were you, I'd just get something like 11:1 compression (wiseco makes 11:1 i think), and run 92-93 pump gas and some klotz octane booster (or fuel additive, i cant remember what it says on the side of the can, buts its a blue can, lol).
This set-up will give you almost as much power, a more reliable quad (than 12:1 or any high high high compression), and spend alot less on gas.
But If you a serious hardcore racer, go for the race gas.

[305exracer11]

i have a 305 kit, it runs awesome. most of the time i run cam2 blue, but u can run pump gas.