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TOPIC: Spark Plug Gap

Spark Plug Gap 2 years 7 months ago #114928

  • WizardIII
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Got a Bearcat 55. Could someone remind me what the plug gap is with the Pertronix ignition? Can't find the info.
Thanks,
Steve

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Re:Spark Plug Gap 2 years 7 months ago #114969

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OK, finally found a 3 year old post from '4stroke' that says after installing the Pertronix unit he gapped the plugs at .040". Is that the general consensus? Yes/no?
Thanks,
Steve

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Re:Spark Plug Gap 2 years 7 months ago #114977

  • MarkS
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That doesn't sound unreasonable Steve, I think "normal" gap is usually around .035".

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Mark

Re:Spark Plug Gap 2 years 7 months ago #114993

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Well, it's been running fine at .040 but besides looking like I gapped them with a box nail the plugs were on the black side. Book says .025 with stock points so maybe I'll split the difference.
Thanks

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Re:Spark Plug Gap 2 years 7 months ago #114997

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Black wet or black dry? Wet would likely be oil consumption and dry would be running rich (too much gas).

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Mark

Re:Spark Plug Gap 2 years 7 months ago #114999

I posted this same answer on another site, but will share it here too, it's my own two cents worth.

Spark plug gap is more determined by the coil output. If you still run an original style coil with the resistor wire, the gap needs to be 0.25. If you run a 12v high output coil, you can increase the gap to 0.40.

Dave Riker

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Re:Spark Plug Gap 2 years 7 months ago #115126

  • WizardIII
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Mark,
Black dry so I plan on playing with the carbs a bit also.

Dave,
Good info on the coil. It looks old so I think it's original. Have to check on that.

Thank you both for your input.

Steve

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