The AGM V1 engines were working OK for the most part. But a few people got some with prop-driver hubs that wobbled more than they should. The AGM V2 engines appear to have had a batch made with the wrong cylinder/head on them. Sort of like putting a long stroke unit on a short stroke engine. Thus the V2 engines that people bought would only develop about 1/2 the power that they should have. AGM was offering to fix the problem as a warranty issue. But at the time, they didn't have the new cylinder/heads in yet.