Knucklehead Spark Plugs




After keeping a little log for a year on how my champions are running in my knuck i have finally decided to quit using them , whether the D16 you buy today are old stock or not i don't know , but i do know they burn out quickly, give a weak spark or an intermittent spark which in turn makes your bike run like a pig , spending time checking over all the usual things connected with these symptoms  like float level,plug leads, slipped timing ,bad points , condenser ,when all along its the brand new Champion plugs you have just screwed in that are the culprit !!  without changing a thing on several occasions except the Plugs from D16 Champions to NGK AB-6 the Bike ran like a dream !!! 
what plugs are you running in your knuckleheads ??? 
oh i have around 40 D16 for sale 



7 comments:

Rowan said...

i'm running champion D-16's..... same set for a year, i'd buy some off you but i have 2 spare sets so i guess i'm stocked up for a coupla years at least.... i think magnetos eat them but running a distributor they work for me

but saying that has probably just bloody jinxed them

Rowan said...

actually i've just checked on the shelf and thats not entirely true cos i have gone through 3 sets this past year..... oh yeah you had them off me last time you were here hahahaha

Knuckle Junky said...

if you want perfect start,idle and power...the only solution is good old original HD#3.Plus it will last forever with any gas in any country and your bike will look beautiful with it.I use to burn a D16 or two every year with the EL ,8 years ago i have screwed these sparkplugs on the knuckleheads and they are still there.

grant said...

i have D16's in my '37 UL with an auto advance timer and a fresh motor. Only have about 800 miles on it so far, but this is something for me to think about!
Would love some #3's along with every other guy looking for them, plus i heard someon repoped them back in the 80s and those ones are shit, but hard to tell from originals now...

Diesel said...

Run D16 in my ULH with few issues but maybe it's because I don't know any better...will try a set of the NGK's. Thanks for the tip! I just picked up a '46 FL - I'll try out both in it just for kicks - pun intended.

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Anonymous said...

I agree, Kept blowing Champs on my 48 FL...switched to NGK R5670-5....runs like a dream instead of a
hairy-dog'!