chris west - I seriously doubt GRP/Rossi has anything to do with Novarossi.

For my $0.02 on the original subject.

I really don't care what hype either manf. puts behind their engines, they need to prove it out on the track.

Orion - they don't have a good reputation at our track. The Wasp .12 were hard to tune (at least at our altitude) and didn't seem to be able to keep up with the novarossi based motors. Will the new engine be the same way? Possibly/Possibly not. From everything I've read, they'll be hard to find the proper gearing/pipe/tune because of all the extra tuning options.

GRP/Rossi - New company period. Only with a top notch engine designer. Really tough to tell how these engines will be to tune. Probably slightly easier than the Orion engine, but who knows. The biggest thing going for the Ninja engine is that it is backed by Mugen Seikii, and I don't think they would've dropped JP for Ninja if the Ninja didn't show any promise.

Both have some good price tags on them (thank goodness for that).

If I was told to choose one or the other at this moment, I would probably choose the Ninja at this moment. But thankfully I don't have that problem.