Both are resistive type plugs. The "R" indicates a resistor plug and the "Q" a EMS (electromagnetic suppression) resistor plug used to reduce noise in sensitive digital electronic circuits. In automotive uses Champion lists some Saab's requiring this "Q" plug.
Lawn and garden small engines substituting to the RC12YC plug works just fine. In fact Sears will send you the RC12YC as a OEM part even though the engine was shipped with QC12YC plugs.
no
I found lots of replacements for the Champion rc12yc but none for the yx. Are they the same spark plug? Why wouldn't anyone carry a spark plug for a lawn mower that's two years old?
your dum
Not really, but that is the only plug Sears sells as a substitute. The RC12YC plug looks like it was designed for a gap of 0.035-0.040", while the RC12YX plug was clearly designed for the recommended 0.020" gap. The RC12YC electrode is a fat cylinder like most spark plugs, while the electrode of the RC12YX is cut down to about half of the diameter. I'd guess the special RC12YX makes it easier to start the engine on a single pull.
Champion RA8HC has the same thread, seat, reach, hex size, and terminal type. I ordered a Kohler plug from Amazon and they actually shipped me this Champion Plug.
I was wondering the same thing this afternoon
rc is a taller electrode plug physically so im stumped ?? and has taller and different center electrode than "QC" may interfere combustion cycles. maybe not enough tech data on these forums
rc is a taller electrode plug physically so im stumped ?? and has taller and different center electrode than "QC" may interfere combustion cycles. maybe not enough tech data on these forums
ngk Bm6a its the same plug
No there are a number of different types of spark plug.
The spark plug locations are all on the same side of the engine. They are in the side of the head, where the plug wires are connected.
They are all the exact same, all serving the same function. The different lengths are solely for convenience.