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Champion stock # 71
NGK BPR6ES Champion RN9YC Champion Rn11YC4 [hotter plug fights carbon buildup
RN9YC or BPR6ES NGK - BPR6ES or DENSO - W16EXR or Champion - RN11YC or Bosch - WR6DC The RN11YC burns hotter and prevents carbon buildup better than the RN9YC.
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.
a ngk cr7hsa spark plug
Possible spark plugs for torch F6TC:Autolite 63Denso IW20Denso VW20Denso W20EX-UNGK BP6ES
1986
How do you replace the flint in a scorch torch model # 61355
Bosch provides a cross reference chart for the Torch. This chart should give all of the various cross references for the Torch series including the F 7 RTC plugs.
One I know of is NGK CR6HSA
torch GL4RC or Champion J19LM