Spark Plug Index Washers
Grand HDF Member
Joined: Dec 2012
Posts: 3,782
Likes: 1,202
From: river
do these the things produce a measurable difference or is it just a drag strip "Best Practice"?
Side note, still on stock dual fire coil too.
I have index washers to keep the plugs from hitting the pistons on both my 1250/1275. So many theories as to which direction it goes if youre indexing for the plug position itself. I took Aarons advice on which way to point the plugs. Had my 12 year old son do it. He enjoyed the process. I, on the other had have never indexed a sporty plug ever. If youre looking for everything, sure , why not. Im my experience it takes a lot of everythings to make a difference.
Road Warrior
Joined: Sep 2017
Posts: 1,609
Likes: 694
From: over the mountain
Aaron Wilson from Hammer says...
They're needed when using prepared 883 heads and our full .500 dome 30 degree pistons. Those pistons are used in the 110+ and 120+ hp packages. Without the washers, the domes will hit the spark plugs and close up the gaps. So they weren't a part of your package because they aren't needed with your pistons.
They're needed when using prepared 883 heads and our full .500 dome 30 degree pistons. Those pistons are used in the 110+ and 120+ hp packages. Without the washers, the domes will hit the spark plugs and close up the gaps. So they weren't a part of your package because they aren't needed with your pistons.
Aaron Wilson from Hammer says...
They're needed when using prepared 883 heads and our full .500 dome 30 degree pistons. Those pistons are used in the 110+ and 120+ hp packages. Without the washers, the domes will hit the spark plugs and close up the gaps. So they weren't a part of your package because they aren't needed with your pistons.
They're needed when using prepared 883 heads and our full .500 dome 30 degree pistons. Those pistons are used in the 110+ and 120+ hp packages. Without the washers, the domes will hit the spark plugs and close up the gaps. So they weren't a part of your package because they aren't needed with your pistons.
oh but, they are. i called them earlier
Last edited by cvaria; Apr 10, 2018 at 06:34 PM.
Road Warrior
Joined: Sep 2017
Posts: 1,609
Likes: 694
From: over the mountain
You can take it up with Aaron. he sent me the e-mail and that's a quote from him.
They're needed when using prepared 883 heads and our full .500 dome 30 degree pistons. Those pistons are used in the 110+ and 120+ hp packages. Without the washers, the domes will hit the spark plugs and close up the gaps. So they weren't a part of your package because they aren't needed with your pistons.
Aaron Wilson
HAMMER PERFORMANCE
355 McGhee Road
Sandpoint, ID 83864
208-696-1250
http://www.hammerperf.com
They're needed when using prepared 883 heads and our full .500 dome 30 degree pistons. Those pistons are used in the 110+ and 120+ hp packages. Without the washers, the domes will hit the spark plugs and close up the gaps. So they weren't a part of your package because they aren't needed with your pistons.
Aaron Wilson
HAMMER PERFORMANCE
355 McGhee Road
Sandpoint, ID 83864
208-696-1250
http://www.hammerperf.com
Last edited by apache snow; Apr 10, 2018 at 07:31 PM.
Tourer
Joined: Jul 2017
Posts: 265
Likes: 89
From: The S.E. Valley. AZ
I index my plugs on my 1200c, I don’t know if I’ve gained anything, but I thought the small investment towards a couple boxes of plugs and washers, was worth a try.. I have no complaints, I actually enjoyed the process of indexing.
Grand HDF Member
Joined: Nov 2012
Posts: 4,997
Likes: 2,083
From: Newport,TN area
To quote hexnut, I think you may be "picking flyshit out of pepper"
and wont notice any difference for a street application, but hey, if
you've got the time, why not ?
T. (think I could loose weight & make more of a difference)
and wont notice any difference for a street application, but hey, if
you've got the time, why not ?
T. (think I could loose weight & make more of a difference)
You can take it up with Aaron. he sent me the e-mail and that's a quote from him.
They're needed when using prepared 883 heads and our full .500 dome 30 degree pistons. Those pistons are used in the 110+ and 120+ hp packages. Without the washers, the domes will hit the spark plugs and close up the gaps. So they weren't a part of your package because they aren't needed with your pistons.
Aaron Wilson
HAMMER PERFORMANCE
355 McGhee Road
Sandpoint, ID 83864
208-696-1250
http://www.hammerperf.com
They're needed when using prepared 883 heads and our full .500 dome 30 degree pistons. Those pistons are used in the 110+ and 120+ hp packages. Without the washers, the domes will hit the spark plugs and close up the gaps. So they weren't a part of your package because they aren't needed with your pistons.
Aaron Wilson
HAMMER PERFORMANCE
355 McGhee Road
Sandpoint, ID 83864
208-696-1250
http://www.hammerperf.com
Last edited by cvaria; Apr 10, 2018 at 08:16 PM.
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Yes sir, i was crunching numbers, checking on what the washers were there for and if they had to be there.
Last edited by cvaria; Apr 10, 2018 at 08:31 PM.
Stellar HDF Member
Joined: May 2007
Posts: 3,258
Likes: 523
From: USA
Indexing is inexpensive garage fun on a Sportster.
Beer, friends, music, fun stuff.
In theory indexing helps burn the fuel in the combustion chamber more effectively.
Any noticeable performance difference...I don't think so.
Still great fun.
Beer, friends, music, fun stuff.
In theory indexing helps burn the fuel in the combustion chamber more effectively.
Any noticeable performance difference...I don't think so.
Still great fun.
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chgofirefighter
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Feb 11, 2014 03:01 AM