Plug Gap ?

Reply Subscribe

Thread Tools

Search this Thread

Apr 9, 2011 | 11:48 AM

dirty78ironhead

Thread Starter

Tourer

Joined: Oct 2007

Posts: 269

Likes: 0

From:

Plug Gap ?

I have a 78 with a ultima ignition and was wondering if the gap or plug should change from my points set up. I just run the standard plug listed in the manual.

Thanks
T-Ron

Apr 9, 2011 | 11:57 AM

IronMick

Stellar HDF Member

Joined: Jun 2008

Posts: 3,179

Likes: 118

From: London, ON Canada

The plug gap for electronic ignition [EI] is 040. For points it is 030. For mag ignition it is 020.

I am running the same EI. I have always used NGK BPR6HS for EI. It seems that there is always controversy about various brands of spark plugs, but never a bad word about NGKs.

To go by the manual you would have to look at 1981 and newer specs as these have "modern" EIs. The spec for '79 [and i think for 80?] in the manuals is wrong. For the EI models HD recommended a plug gap of 060 for "marketing" reasons.