r/Fixxit • u/kenguarnieri • 1d ago
Motorcycle coils
Hey I have a question I have a 2005 Harley Davidson. With a 100” motor. 585 cams and a 2 into 1 ultima header. Can I use a higher output coil to increase performance
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u/Caldtek 1d ago
How will a coil increase performance?
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u/kenguarnieri 1d ago
That’s what I’m asking
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u/JDSportster Harleys, lots of them. 1d ago
It won’t. Stock coil is pretty good on the twin cams. No need to change it.
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u/bitzzwith2zs 1d ago
Hotter spark, longer duration spark. More compression requires a stronger spark
... none of which will help OP and his stock tractor motor
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u/kenguarnieri 1d ago
If my motor is larger than stock will it improve anything by putting a larger output coil on it
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