I've been watching this thread and am too dumb to keep quiet. Back when the "open" or "gp" class came out, everyone started with a 951. Long story short, the 951 SUCKS water. It was bad enough in a sitdown, now you want to put it in a water logged hull, not a good idea. It's carbs are located perfectly if injesting water is your goal. It's longer rods will not enjoy a "small" hydro lock. Take out the balance shaft? Great way to ruin that motor. It was designed around it but go ahead. Our small yami based engines may not be perfect but they are really good for how they are used. SD is not what comes to mind when reliability is the topic. Also, it is a big engine, size wise. Coffman pipe works good, but it's a big package to fit in a SXR. On this, my sounding like a dick is just trying to save money and time. It's also a lot of weight on the motor mounts when you don't land just right, just like the heavier engines out there. But my sounding like a Rick, (R&M) maybe, just maybe you'll focus your efforts on a different line, or just do it anyway.