It sure is nice to know that there's a max rpm with the Moki 2.10. But RPM doesn't mean a thing. As an example I have a Moki 2.10 with no pump, regular fuel line, no drilled out clunk and 126, 13-14 minute flights, and it definately depends on the prop I use for the performance I get:

Zinger Pro- 20X10 - RPM 7200 - Poor Perfromance
Menz S - 20X10 - RPM 6200 OK Performance
Bolly 20X10 - RPM 7400 Great Performance
Mezlik - 20X10 RPM 6800 Less Performance than Bolly but better Performance than Menz S

I've got a Bambula 20X10 that I haven't mounted yet but I'll let you know the performance factor on that when I fly Patty with it.