Spark plugs

[t-jacobs]

I Have a stock 64 panhead. The bike has Harley spark plugs ( 3,4 ) in it now, but they are in rough shape. I would like to replace with harley plugs but the parts book shows a few type 3,4 - 2 - 4 ect. What would be the correct # plug for my bike?

[bmh]

The3-4 plugs should work pretty good for general service. If you don't absolutly need H-D plugs may I recomend Autolite's plugs, they seem to work really well. Would have to go out to the garage to get the numbers. If you want them let me know
Brian

[t-jacobs]

Spark plugs

Thanks Brian,

I just wanted the HD plugs for show. I would have no problem running Autolite on a regular basis. What is the difference in the HD plug #s ?

[bmh]

Heat range is what the numbers refer to. The lower the number the hotter the plug. 3-4 is a special purpose plug for all around use. Have had to run a 3 in one cylinder and a 4 in the other to get some to run proper for the way they were riden.
Brian

[t-jacobs]

Spark plugs

That explains it.

thanks again