ORIGINAL: asmund

I`ve just run 3 tanks of break in.I must say i`m not impressed with performance so far.When I ran 0% nitro it would not peak and scream, just seemed slow when I leaned it. I then miksed the fuel 50/50 with some 15% nitro fuel and it became much better. it now peaked and sang high when I leaned it, so I think it definately needs some nitro. I couldn`t tach it because it was not enough light out, but I doubt it gave more rpm than my asp 52 xls on the 12.25-3.75 prop.maybe I had to high expectations of this engine.My new harrier 46 is going to carry one of the two engines, and I`m going to pick the most powerful one even if it turns out to be the asp. I couldn`t care less if the asp will not last as long as the mvvs as long as it is powerful while it runs. A setup or a couple of bearings dont cost much.so Is there any chance that my mvvs will pass 13300 on the 12,25 prop or is that to optimistic to be expected.I have the tuned muffler(3248) and the outlet seems a bit small to me. It measures about 6.6 millimeters which is smaller than all other engines in the 50 size I`ve seen.I suspect it to be a little restrictive and I wonder if it would help to open it a bit. any thoughts???