See that torque limiter/anti-backfire gizmo? Test that with a torque wrench. You can wedge the small gear in a 12 point socket while holding the big one in a vise with soft jaws. I believe the factory spec it 50 ft. lbs but look it up.
It they don't work you'll have to do the sprag job again. I've done many of them and added an extra spring-washer to accommodate a Harley four-pole, starter-field and big battery. That upped the torque capacity but after a while the sprag failed so I went back to the factory setup and tightened it ever so slightly more and staked it down. That holds the torque most of the time but occasionally the little balls inside let go and it makes a racket. Better that than replacing sprags though. It's been that way for a few hundred starts. But, if it lets go too many times the little balls will create ramps to escape their holes and it'll let go all the time. In such case, IIRC you can flip the gear with the holes over and use the other side.
But I may be mis-remembering and used another gear as I've had lots of spares. The shop I worked in removed lots of starters for being more trouble than they were worth and I kept the parts the owners didn't want.