I have a Moki 1.80 on my 13.25 lb 1/4 scale GP Giles.
The engine turns a Bambula 18x8 at 8500 rpm and the performance is unlimited.
I want to try a 19x8 to make the engine work a little more and get more vertical.
A 18x10 Menz std gives me better speed and barely unlimited vertical.
The engine uses a K&B 1L plug, FAI fuel, Bisson pitts with the tips cut off and I have installed a Perry VP-30 pump for consistent engine runs.
Great combination.
Fuel burn is about 1.5 oz/min and I'm not as careful as I could be with the left stick.
Check these links:
http://members.cox.net/moorman1/Bigtigre.htm
http://www.justengines.unseen.org/moki180b.htm
Good luck with your Moki!
John