Smitty,
The popping at idle is fairly common with Rams, and is nothing to worry about. See this thread for an explanation of why it happens.
http://www.rcuniverse.com/forum/m_32...tm.htm#3240486

My Ram 500 popped at idle. I put about 70 flights on it that way and it ran fine otherwise. After sending it in for new bearings and service it didn't pop any more. I never mentioned it to Modellbau USA and I don't know what they did to fix it.

Just fly it as is and mention it next time you send it in for service.

Joe