I had to change the factory plug to a Fox Miracle plug on my Saito .91 before I could get a reliable idle. Also the OSMax 4 cycle plugs are very good in Saitos. You probably need to run at least 15% nitro for a good running engine and more nitro is incrementally better for power and incrementally worse for your pocketbook.[:@]
PS. you might enjoy reading through this previous thread regarding the .82 (Click on):
http://www.rcuniverse.com/forum/m_17..._1/key_/tm.htm