This might be useful--> NGK BP7ES cross REF Guide

[HOTEL71]

https://www.sparkplug-crossreference.com/convert/NGK_PN/BP7ES

 

[jonesey]

Many Thanks Hotel, very useful.

 

[Paul Sutton]

You need to be cautious using this cross-reference. It seems to be based on physical dimensions and possibly?? heat range. Note that the BP7ES is a non-resistor type yet it is cross-referenced to Autolite 63 which is a resistor type. If running resistor spark plug caps then go for non-resistor spark plugs.

 

[xjwmx]

Champ. N7YC is probably a good replacement. The forgotten N7Y is spec'ed in the manual beside BP7ES, and the 'C" is its current iteration at Champion

 

[RC4MAN]

Back in the 70's we always chucked the Champions in our Brit bikes in the trash and substituted NGK, they lasted longer and fired more reliably without fouling

 

[DirtyErnie]

Back in the 70's we always chucked the Champions in our Brit bikes in the trash and substituted NGK, they lasted longer and fired more reliably without fouling

My Briggs 5hp lawn mower thinks exactly the same way. It's nice to see that some things are consistent in the long-term.

 

[Grimly]

I'll never forget fitting four new Champion plugs as part of a service on a car, and the damn thing wouldn't start.
Much head-scratching and diagnosis followed, eventually replacing the new plugs with four new ones.
Bastard still wouldn't start.
Turned out the entire box of ten Champion plugs were duds.
Never used them since.
Always fitted NGKs and occasionally Denso since then and never had a bad one.