I just changed my starter motor for one of these, on my 5424.
Starter Universal Marine Diesel 5424 M 30 M30 Kubota | eBay
Works great, so far. It was a nightmare getting the bolts out of the old one, but the new one is not so tricky as the OD is smaller, so it's much easier to reach the bolts.
Painted it gold, first, of course.
The old one had a problem with, very occasionally, not turning over.
Starter Universal Marine Diesel 5424 M 30 M30 Kubota | eBay
Works great, so far. It was a nightmare getting the bolts out of the old one, but the new one is not so tricky as the OD is smaller, so it's much easier to reach the bolts.
Painted it gold, first, of course.
The old one had a problem with, very occasionally, not turning over.