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.
I don't know the Champion equivalent to the Troy Built 951-10292 but I bought a NGK BPR6ES 7131 for my lawn mower and it works like a champ.
rdz19h
Champion, which is what they were built with.Champion, which is what they were built with.
Champion J6C
The Champion number it was built with.The Champion number it was built with.
Champion RDZ19H
The Jenn Feng 9295-310502 spark plug is typically used in chain saws. The champion spark plug equivalent is a RZ7C.
The one it was built with. Champion RC12LC4
For a 1970 OMC 6HP engine, the recommended spark plug is the Champion J6C or an equivalent plug
Champion Spark Plug Co. is currently owned by Federal-Mogul.
I will assume a valve-in-block engine and the answer is an RJ19LM Champion or equivalent.
Champion RDZ4H
Champion 3071