When purging a motor after running alcohol how much fuel needs to be run through it?

I've got some room on my ATV to mount a small coolant recovery tank (like from a Banshee) to use as my purge tank, but I want to make sure it will hold enough gas to do the job.

I'd really like to use a smal Polaris coolant reservoir, which has a 10oz. capacity. I'll be running a 3/8" line from it as well. Would this be enough to fully purge a 400cc motor?

 

That should be about enough. You only need enough to run the bike for about 1-2 minutes. anything more is unnecessary.