whrer to start to jet a 489 cheetah

[viking9990]

hi i have a 489 cheetah and i wanted to try out some tm 38 makunis that i have my pilot is 40 and mains are 310 im at sea level

it's a 489 drag ported 180psi compression sheere small bore pipes is this a good stARTING POINT OR SHOULD I START AT 340 MAINS

THANK YOU VERY MUSH FOT YOUR HELP

[firebanshee]

You should always jet richer and work your way to the leaner side.So i would start with the 340s.