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  1. #1
    scorp's Avatar
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    Are all Domestic engine coils the same?

    Can you use/exchange a 900 or 1050 on a 1200 or vice-versa?
    Regardless of year?

    Thanks


  2. #2
    scorp's Avatar
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    oops forgot.... Carbed engines only.

  3. #3
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    As far as I know the triples are all interchangeable.

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by scorp View Post
    Can you use/exchange a 900 or 1050 on a 1200 or vice-versa?
    Regardless of year? ...
    As far as I know the carburetor ignition coils for three cylinder red domestic engines are electrically interchangeable. There are a couple of different ohm ranges for the primaries but this seems to not matter.

    There are at least two variations of the secondary (spark plug) wire configurations in the triple coil packs, so be sure to verify that you have the correct spark plug wires going to the correct cylinders. There is a diagram via my signature links of two versions of the 900/1050 ignition coils.

    If the spark plug wires are incorrectly connected you can cause backfires which can damage the engine crank shaft seals.

  5. #5
    Rasta Mon Condoms We Be Jammin!!!!! TxVirageTx's Avatar
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    what about the early 900's that used a different firing order?

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Arrow How to identify which ignition coil spark plug wire goes to which cylinder, red 3 cyl

    Quote Originally Posted by TxPro1200 View Post
    what about the early 900's that used a different firing order?
    That is part of what I was referring to.

    The various triple ignition coils will work on any engine as long as you make sure you really do have the plug wires going to the correct cylinder heads.

    Going from memory:
    First connect ONLY the MAG cylinder spark plug wire and make sure the engine will start and run (briefly) on just the MAG cylinder. Label the wire MAG and then disconnect that spark plug wire.

    Note: If the engine has just been rebuilt or the carbs are bone dry, prime the carb intake with a teaspoon of gasoline. Do NOT lean over the engine while trying to start it as an unexpected backfire could burn you.

    Tip: It make take some throttle squeezing to get the engine to run on only one cylinder. Run it just long enough to prove that you have the correct spark plug wire connected. 2-3 seconds is plenty of run time.

    Next hook up only the CENTER spark plug wire (at least, what you think is the CEN wire). See if the engine will start and idle on just that CEN cylinder. If yes, label that wire as CEN.

    If it gives no sign at all of wanting to start, move that plug wire to the PTO cylinder. Try again to start the engine. If it now starts and idles, shut it off and label that wire as PTO.

    Now all three plug wires are labelled correctly for your engine, regardless of firing order or which ignition coil pack you are using.

  7. #7
    scorp's Avatar
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    Thanks Guys, K447,

    Thats great, i have a few older coils that are in good condition, and figured if i could use them, i will keep them as spares.

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