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CVO Technical => Twin Cam => Topic started by: Z10 on November 06, 2011, 08:48:11 PM

Title: Plugs
Post by: Z10 on November 06, 2011, 08:48:11 PM

Was at the local dealer yesterday with a friend and picked up a set of plugs. Haven't pulled them since I got the bike in May. Pulled the boot and saw Autolites installed. 5/8 sparkplug socket too small.  Hmmmmm 11/16 to remove them..that's a first.  Installed HD 32192-10. The Autolites are P# 4164. Is this a common plug for a 2006 103?

Title: Re: Plugs
Post by: strokerjlk on November 07, 2011, 06:29:09 AM

Common plug. I used to run them in my evos.

Title: Re: Plugs
Post by: Twolanerider on November 07, 2011, 11:11:22 AM

One small detail to pay attention to when using that plug with the 11/16" hex.  If you mount head bolt bridges the socket won't go in to remove the spark plugs.  You'll have to remove the bridges every time you want to change plugs.

Title: Re: Plugs
Post by: HILLSIDECYCLE.COM on November 09, 2011, 04:17:10 PM

...............and on engines that carry at/near 190-200 psi ccp, at least here with the NGK's we use, and a couple other shops that tune, have witnessed a tick more power if the gap is snugged up to .035". :)
Scott

Title: Re: Plugs
Post by: eleft36 on November 09, 2011, 07:49:19 PM

I use 4163 plugs in my 103 set @ .035.
Al

Title: Re: Plugs
Post by: HD Street Performance on November 10, 2011, 10:39:22 PM

On our Pro Heads I ship the NGK plugs DCPR8E with shims.