McCulloch Champion Spark Plugs
HP |
Notes |
Years |
Resistor Plug |
Plug Gap |
3.5 | - | 1964 - 1969 | RH12 | 0.035 |
4 | - | - | RJ14YC | 0.035 |
4 | w/Long Shaft | 1964 - 1969 | RH12 | 0.035 |
7.5 | - | 1964 - 1969 | RH12 | 0.035 |
9 | - | - | RJ12C | 0.035 |
9.5 | - | - | RJ12C | 0.035 |
14 | - | - | RJ12C | 0.035 |
28 | Manual Start | - | RJ12C | 0.030 |
45 | Manual Start | - | RJ12C | 0.030 |
45 | Electric Start | - | RJ12C | 0.030 |
75 | - | - | RJ12C | 0.030 |
590/630 | - | - | RJ12C | 0.030 |
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Q:
Replacement spark plugs must be indexed correctly. What dose that mean?
A:
Indexing a spark plug in a cylinder head is the process of aligning the ground electrode on the spark plug to a specified direction inside the combustion chamber.
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