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spark plug gap

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Old

Jan 30, 2017 | 03:21 PM

#1

cajun1957a

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spark plug gap

My owners manual states that a H-D 6R12 spark plug is to be used with an 2003 RKC. The gap is from 0.038 - 0.043. Why such a variance in gap? What is the spot on gap? I know with my 1965 sportster with points, plug gap had to be closer than that.

Randy

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Old

Jan 30, 2017 | 05:24 PM

#2

smitty901

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Because if you are in that range it don't madder.

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Old

Jan 30, 2017 | 05:26 PM

#3

Boomer1143

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From: Boise, Idaho

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The difference in gap is only .005. that isn't very much. I like to set plugs on the low side to account for erosion of the ground strap and electrode.

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Old

Jan 30, 2017 | 06:05 PM

#4

slhanks4

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From: Gilbert, AZ

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Set it to .040 and forget about it.

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Old

Jan 30, 2017 | 07:44 PM

#5

seniorsuperglideE8

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I've used the .040" forever (since '99), works all day long.

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Old

Jan 30, 2017 | 07:52 PM

#6

TwiZted Biker

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From: Niles Canyon Ca.

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Quote:

Originally Posted by slhanks4

Set it to .040 and forget about it.

Quote:

Originally Posted by seniorsuperglideE8

I've used the .040" forever (since '99), works all day long.

This, the range you read about is minimum/maximum. Split it at .040" and ride.

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