What is the Champion equivalent to the Troy Built 951-10292 Spark plug?

Here is what I would say. I believe the engine is made by LTC. LTC says the suggested plug is the Torch F6RTC. If you buy the MTD plug, the plug in the package is a Torch F6RTC. LTC goes further on their web site to state the equivalents in their mind are: 1. Champion Plug: RN9YC 2. NGK Plug: BPR6ES 3. Bosch Plug: WR6DC. I am not happy with Torch. At the first winterising of my 2010 Troybilt 3090; 357cc engine I pulled the plug and it was rusty...yes rusty. I would say the MTD plug does have a black coating which may help. Anyway, I would say this is a good cross reference. However, I have not yet confirmed that the Chinese Troy Bilt motor is LTC but I would give it 95% certainty given the engines they advertise on their site. In any event they do show this plug crossing to the above listed plugs.