ORIGINAL: togatoga
Ken, i did the same to my saito 125 and did not experience a drop in rpm at all. I tapped the inlet manifold and connected a tube to the breather.No rpm loss and less mess. I was tired of cleaning up the mess.Its installed in a WM senior sports 90 and running 10% nitro and 20% nitro occasionally.
I'm converting a saito 115 next.
OK, I'm not really surprised to hear that. The small amount of oil from the breather shouldn't make a significant difference. However, you said that more oil won't make ANY difference, and it does. It reduces the amount of actual power-producing material that can be introduced into the cylinder. In small amounts, it may not be noticable, but it DOES make a difference.
However, note that you introduced the breather into the MANIFOLD, not the carb body. I imagine you are using muffler pressure or some other means to pressurize your fuel system too, right? If you had experienced a large loss of performance after making the modification, wouldn't you have bought a new manifold, so you could get your engine back up to stock performance?
I just think that this is a failed experiment, and in order to get back to what the stock performance was, he should go back to the stock configuration.