My Moki has the Pitt's muffler with the exhaust tube ends cut off.

h82crash; My Saito 180 turned the APC 18/6 wide at over 9000 rpm. The Moki 210 turned this same prop at 7860. Now thats low.

I just took the Moki off the Ultra Hots. I will try a couple of bench runs and then send it back.

The confusing thing is that the Moki does every thing right. Easy starts, even when hot, good idle, good transition, just weak on the top end.

Hope to get to the bottom of this problem soon.

tonyc