How to sync your butterfly valves without any special tools

Sorry for the bad editing and quality of the video. Carburetors from a CBR250RR MC22 Here i sync the butterfly valves using no special sync tool, just a screw driver, the idle adjuster and some Kerosene(dont use water usless you dry/blow out all the water after, kero/fuel for best results ) Sync carbs 1&2 together, then 3&4, then 2&3. if it's your first time doing this and at the end each valve is not draining at the same repeat the steps, you must make sure 1&2 and 3&4 are in sync before syncing 2&3. mak