This muffler is sized good for a .10 or .15, but not a .30.
I think the standard of their engines is proof enough that the people at Enya know what they're doing and aren't idiots. Do you really think that they'd design and produce something as good as an SS30 or 40XZ, only to sell it with a .10-sized muffler?!
There is a post in my tach thread by a guy using an SS25 Al-Chro getting poor figures with the small muffler.
Unfortunately you didn't notice that he isn't even talking about the same muffler. The SM251 is the 'special quiet muffler'. I've never used one, but if it's got cones or baffles in it, I'd happily believe that it would knock a bit off the performance (in any case, he was only down 7-800 compared with the OS muffler, not 2000+). Anyway, it's a completely different item and hardly relevant to this discussion.
I think you should re-check your numbers because I do not think they are any good. No offense.
None taken. Sure I can re-check them, but the result is just going to be the same. When I get a chance, I'll repeat the exercise and video it so you can see for yourself. I should've mentioned that as well as taching it, we timed the model with and without the muffler. There was little appreciable difference; I think 2000+ rpm would've been noticeable.
The only theory I can think of for your results is that if the engine wasn't properly run-in at the time, the smaller muffler might've caused excessive heat buildup and prevented the engine revving properly. That's just a wild stab though. Otherwise your numbers don't make a lot of sense to me. I will agree that they're great little engines, though.
