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We stock almost every Champion spark plug used in outboards, so you don't have to buy a full box to get the plug you need. Below are some plugs commonly needed for early Mercury Outboards.  Many others are available, please inquire.
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SPARK PLUG - CHA113 (RV12C) SPARK PLUG - CHA113 (RV12C)

Our Price: $2.86
SPARK PLUG - CHA120 (N5C) SPARK PLUG - CHA120 (N5C)

Our Price: $2.53
SPARK PLUG - CHA129 (RF10C) SPARK PLUG - CHA129 (RF10C)

Our Price: $2.86
SPARK PLUG - CHA14 (RJ12YC) SPARK PLUG - CHA14 (RJ12YC)

Our Price: $2.86
SPARK PLUG - CHA18 (RV15YC4) SPARK PLUG - CHA18 (RV15YC4)

Our Price: $2.56
SPARK PLUG - CHA2412 SPARK PLUG - CHA2412

Our Price: $5.00
SPARK PLUG - CHA25 (RV17YC) SPARK PLUG - CHA25 (RV17YC)

Our Price: $2.86
SPARK PLUG - CHA304 (RS9YC) SPARK PLUG - CHA304 (RS9YC)

Our Price: $4.52
SPARK PLUG - CHA312 (L87YC) SPARK PLUG - CHA312 (L87YC)

Our Price: $2.80
SPARK PLUG - CHA322 (RN11YC4) SPARK PLUG - CHA322 (RN11YC4)

Our Price: $2.68
SPARK PLUG - CHA328 (L82YC) SPARK PLUG - CHA328 (L82YC)

Our Price: $2.56
SPARK PLUG - CHA332 (RN7YC) SPARK PLUG - CHA332 (RN7YC)

List Price: $5.25
Our Price: $5.25
SPARK PLUG - CHA400 (RV9YC) SPARK PLUG - CHA400 (RV9YC)

Our Price: $2.80
SPARK PLUG - CHA415 (RN9YC) SPARK PLUG - CHA415 (RN9YC)

Our Price: $2.86
SPARK PLUG - CHA592 (RJ12C) SPARK PLUG - CHA592 (RJ12C)

Our Price: $3.46
SPARK PLUG - CHA63 (RJ14YC) SPARK PLUG - CHA63 (RJ14YC)

Our Price: $2.86
SPARK PLUG - CHA7712 SPARK PLUG - CHA7712

Our Price: $9.60
SPARK PLUG - CHA7919 (QC10PEPB) SPARK PLUG - CHA7919 (QC10PEPB)

Our Price: $14.16
SPARK PLUG - CHA802 (V63C) SPARK PLUG - CHA802 (V63C)

List Price: $6.35
Our Price: $4.75
You save $1.60!
SPARK PLUG - CHA810 (RA8HC) SPARK PLUG - CHA810 (RA8HC)

Our Price: $2.68
SPARK PLUG - CHA811 (L82C) SPARK PLUG - CHA811 (L82C)

Our Price: $3.26
SPARK PLUG - CHA821 (L77JC4) SPARK PLUG - CHA821 (L77JC4)

Our Price: $3.49
SPARK PLUG - CHA824 (UL18V) SPARK PLUG - CHA824 (UL18V)

Our Price: $5.59
SPARK PLUG - CHA827 (L76V) SPARK PLUG - CHA827 (L76V)

Our Price: $8.45
SPARK PLUG - CHA828 (QL77JC4) SPARK PLUG - CHA828 (QL77JC4)

Our Price: $4.90
SPARK PLUG - CHA831 (UL77V) SPARK PLUG - CHA831 (UL77V)

Our Price: $7.30
SPARK PLUG - CHA833 (L78V) SPARK PLUG - CHA833 (L78V)

Our Price: $6.39
SPARK PLUG - CHA835 (UL81C) SPARK PLUG - CHA835 (UL81C)

Our Price: $3.68
SPARK PLUG - CHA837 (L20V) SPARK PLUG - CHA837 (L20V)

Our Price: $3.55
SPARK PLUG - CHA843 (CJ8) SPARK PLUG - CHA843 (CJ8)

Our Price: $2.56