Plug Gapping

[glider.]

Properly gaping a plug is important before installing it.

If you use a flat feeler gauge, it can lead to an improperly gaped plug.

The wire type plug gauge doesn't have the same problem as the flat feeler gauge that can rock and cause the plug gap to be set improperly.

Always check gap on the plug even thou it is new before installing it. They can have the wrong gap due to improper handling when shipped.

Most harleys run a plug gap of .038 to .042 with the optimal setting being at about .040.

Here's a video from Steve07 that will show the proper way to gap plugs...

YouTube - Spark Plug Gap - NGK Spark Plugs - Tech Video

 

[Webbtron]

Re: Plug Gaping

I was out this past week (Son couldn't find his) looking for a wire gap checker and they are not as easy to find as they used to be. I ended up with the slide type, which I'd never used before.

 

[Jack Klarich]

Good link Boss, have you ever seen a plug with no threads?

 

[STEVE07]

Good link Boss, have you ever seen a plug with no threads?

I have never seen a plug lose it's threads,but I have put helicoils into a few cylinder heads that lost theirs

 

[glider.]

Good link Boss, have you ever seen a plug with no threads?

Can't say that I have Jack, maybe it was an injector? :lolrolling

 

[Jack Klarich]

Can't say that I have Jack, maybe it was an injector? :lolrolling

Nah it was a Champion 12yc:s