James, it is all about setup. The KEEP 21M is very popular in the right setup, as with the other engines. The 21 KEEP M, and the 21 KEEP OB, both share the same P/S setup and head buttons and are not interchangeable with the DD which has a slightly larger diameter.Mike, I went through the same thing you did when I was shopping for a nova Rossi there are so many to pick from. I asked the same question a while back. I almost bought the T 35 plus, but I did buy the keep MP since everyone I know like their DD I was thinking it was the same engine except it Not having the PTO . Glenn, are you saying the sleeve in the keep is different than the one in the DD ? If so can I put a sleeve from the DD in the keep? the bore and stroke and the other specs seem to be the same.
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