Spark plug recommendations
Grand HDF Member
Joined: Dec 2014
Posts: 4,890
Likes: 553
From: USA
There is another spark plug thread that was recently posted. Perhaps do a search to determine if there are other threads asking the same thing.
Here is what I posted on the other post for your perusal....
Just thought I respond since no one has at this point...I am far from being an expert so take this info with a grain of salt....lol
Here is a link to some info on spark plugs that I found useful to help me understand the differences.
https://shop.advanceautoparts.com/r/...en-spark-plugs
Refer to my thread post #108 and some responses following that post on spark plug discussion. I have a 96 stroker 4 plug with super B carb.
https://www.hdforums.com/forum/shove...elhead-12.html
According to johnjzjz who is one of the knowledgeable members on this forum on post #111 of my thread, he said " if you have points or dyna and a 5 ohm coil a AC plug is your pal"
Do your own research to validate information you get on the forum. For me, I am currently using AC Delco on my shovel which works just fine, but I have used NGK on my other bikes. My 80 Ironhead has HD plugs as the bike is 99% factory original. Have not had the AC Delco's long enough to comment on longevity.
Here is what I posted on the other post for your perusal....
Just thought I respond since no one has at this point...I am far from being an expert so take this info with a grain of salt....lol
Here is a link to some info on spark plugs that I found useful to help me understand the differences.
https://shop.advanceautoparts.com/r/...en-spark-plugs
Refer to my thread post #108 and some responses following that post on spark plug discussion. I have a 96 stroker 4 plug with super B carb.
https://www.hdforums.com/forum/shove...elhead-12.html
According to johnjzjz who is one of the knowledgeable members on this forum on post #111 of my thread, he said " if you have points or dyna and a 5 ohm coil a AC plug is your pal"
Do your own research to validate information you get on the forum. For me, I am currently using AC Delco on my shovel which works just fine, but I have used NGK on my other bikes. My 80 Ironhead has HD plugs as the bike is 99% factory original. Have not had the AC Delco's long enough to comment on longevity.
Last edited by hscic; Jul 25, 2018 at 05:57 PM.
Thread Starter
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Cruiser
Joined: Mar 2008
Posts: 187
Likes: 9
I'm looking for specific numbers. As far as older bikes go, I've only owned panheads and ironheads my entire life and now have my first shovelhead. I don't know much about shovels and am not sure if the plugs that were in the bike are proper. The bike is not running smoothly and i am just wondering what the right plug and heat range for this engine is. I'd rather get information from guys who have had experience with shovels vs relying on advertisers. The bike currently has NGK BPR5ES plugs in it.
Grand HDF Member
Joined: Dec 2014
Posts: 4,890
Likes: 553
From: USA
This information is from the service manual...
1977-1979 Spark Plug Type:HD 5A6 (Standard) or 5R6 (Resister)
1970 to early 1978 Gap: 0.028 - 0.033 (0.71 - 0.84 mm)
The plugs you are using are crossed referenced to HD 5R6.
Perhaps to obtain more responses, provide more detail/information about your ride and the challenges your are encountering. For example, I have a 1971 FLH but you would not know I have a 96 stroker 4 plug with Super B carb on the bike which would throw the info from the manual out the window. Good luck.
1977-1979 Spark Plug Type:HD 5A6 (Standard) or 5R6 (Resister)
1970 to early 1978 Gap: 0.028 - 0.033 (0.71 - 0.84 mm)
The plugs you are using are crossed referenced to HD 5R6.
Perhaps to obtain more responses, provide more detail/information about your ride and the challenges your are encountering. For example, I have a 1971 FLH but you would not know I have a 96 stroker 4 plug with Super B carb on the bike which would throw the info from the manual out the window. Good luck.
Road Captain
Joined: Jan 2016
Posts: 707
Likes: 165
From: Ashtabula Ohio
Here is the 1 I got&experience with it,
79 Shovelhead 1340,
Autolite Platinum,
AP 65
Runnin blue streak points,
Smooth as a Shovel gets without melting the piston tops,
With that,
Folks will tell ya,
Factory plugs&cross-reference there of,
With proper tune,
Carb jet,
Timimg,
Will run true&no foul,
Builders choice unless your lookin for AMA judging points,
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