I have a 12/24 volt Sullivan starter.

It spins my Super Tigre 3250 diesel pretty good for short bursts on 24v.

I have not tried it on my 44cc echo as of yet, but I'm pretty sure it will do a good job.

You may try your started on 24v. It should be good for short bursts.

Also some of the new high power battery drills do a good job.

There is a guy selling conversions on RCU and his video shows him using a drill with an adapter.