Onan 4.5BGD

I have the installation, operator and service manual for this genset. Nowhere does it list the spark plug type. Anybody (Billy) know the plug type? I converted it to propane several years ago.
 
The Onan number is 167-0272
NGK is TR5
Champion is RS17YX

I am not a big fan of Champion anymore. Used to be a good plug. But I have had to many fail in the last few years.
 

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