The carburetor internally is a little different in the midrange area
The crankshaft is black coated and the timing was increased. I believe the d3 has gone to this timing. we asked for a different specification on the sleeve taper and piston fit. I believe the d3 has gone to this now also. The rod was changed. The cooling finset is obviously different. and that was the major changes for initial production. I am going to submit a new package to them soon which is radically different. right now if you take a d3 apart and lay it alongside a d3 they look the same to the naked eye. they are not that far apart. I have some durability improvments that we are working on also. The power out of the gate is ok a little better than an os tr but we want x12 level power and reliability. The package is done to get that level we just need to pull it together in the next production run which is a couple months off. It takes time to batch new parts and build them. i would expect the d3 to follow suit.

we needed to insure the reliability was there before we turn up the heat on the power and we have had some teething pains but if you know me I don't give up easily. If we can't get there we will look at other options.