Over the years I've replaced the plug in my Duraforce (E series) mower with the recommended NGK BPMR4A setting the gap at 0.035 in. (0.90 mm) as specified on page 15 of the Operator's Manual. Well, while looking at the Service Manual today on pages 2 and 14 it specifies 0.030 in. (0.76 mm). Does it make a difference which is used? Would the 0.030 in. be better than the 0.035 in. that I've been using all these years?
On a related note, I also discovered today that the NGK BPMR4A plug is a resistor plug. Over the years, for one reason or another I've also used Champion CJ8Y and Autolite 2976 plugs. These Champion and Autolite plugs are not resistor plugs. The resistor version of the Champion is a RCJ8Y and from what I can tell Autolite doesn't have a resistor version. From what I've read a resistor plug is used to prevent interference and/or damage with radios, electronics, etc., in the case of the Lawn-Boy I guess that would be the CDI. I'm assuming that Lawn-Boy specifies a resistor plug for a reason and it has me wondering if some of the starting, running problems people have with Lawn-Boys may be caused by using a non-resistor plug?
Thanks in advance for all replies.
On a related note, I also discovered today that the NGK BPMR4A plug is a resistor plug. Over the years, for one reason or another I've also used Champion CJ8Y and Autolite 2976 plugs. These Champion and Autolite plugs are not resistor plugs. The resistor version of the Champion is a RCJ8Y and from what I can tell Autolite doesn't have a resistor version. From what I've read a resistor plug is used to prevent interference and/or damage with radios, electronics, etc., in the case of the Lawn-Boy I guess that would be the CDI. I'm assuming that Lawn-Boy specifies a resistor plug for a reason and it has me wondering if some of the starting, running problems people have with Lawn-Boys may be caused by using a non-resistor plug?
Thanks in advance for all replies.
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