I just replaced my YX plug in my 21 horse Craftsman tractor with a YC and it has worked fine. I think the X is a platinum plug. Only difference is it has a tiny electrode where the C has a normal size electrode.
What is the cross reference of BPR5ES to Champion Champion RN11YC
Most all brand spark plug brands are on the cross reference including Champion. Some of the brands that cross reference to Champion are Autolite and Denso,
8902 cross reference plug
Champion RZ7C
There is no Champion spark plug with the part number 696798. There is a Briggs and Stratton part number 696798 that does cross reference with a Champion RJ 19LM.
The Champion part number is {| |- | QCJ8Y |}
Champion J19LM
BCPR7ES
Brp6hs
Rj19lm
YES
ngk BPMR4A