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its a mtd gold what's the corrext plug ?

Currently has a autolite 3924 which i feel is wrong ...

i believe that engine uses a J19LM champion plug or its equivelant.
What's the model number of the engine?

I think there is a L head 675EX and a OHV 675EXI engine. Need engine numbers or weather it is L head or OHV. The autolite plug crosses to champ rc12yc so that plug is for an OHV engine.

Its OHV . why are the oem ones coated and look copper tho ?