Gapping my new Champ. spark plugs for my twin 200hp Johnsons?

W

wkendwarriors

Cadet
Joined
Apr 15, 2009
Messages
21
So I went and bought a dozen(twin eng.) champion QL78YC spark plugs($2.35ea) as per directed by this web site and the owners manual. How tight or how much friction should it take to pull your gauge thru to achieve the perfect .030 gap??

Thanks
 
tashasdaddy

tashasdaddy

Honorary Moderator Emeritus
Joined
Nov 11, 2005
Messages
51,019
Re: Gapping my new Champ. spark plugs for my twin 200hp Johnsons?

.030 should move thru, next size should not.
 
Vic.S

Vic.S

Rear Admiral
Joined
May 4, 2004
Messages
4,701
Re: Gapping my new Champ. spark plugs for my twin 200hp Johnsons?

There should be a "slight drag" when sliding then gauge through.

Not tight, not loose either.
0.029 will be loose, 0.031 will be tight even if it fits.

But is it that critical?
 
W

wkendwarriors

Cadet
Joined
Apr 15, 2009
Messages
21
Re: Gapping my new Champ. spark plugs for my twin 200hp Johnsons?

Thanks, that makes sense. Can't wait to get her in the water.
 
C

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,148
Re: Gapping my new Champ. spark plugs for my twin 200hp Johnsons?

There is a definite technique to using a feeler gauge to set the gap of a spark plug. That may be why they are called "feeler gauges". The correct thickness feeler gauge should pull thru the properly gapped plug with a bit of friction, but not too much.
A lot of plugs come pre-gapped. You still need to check 'em, but they should be close.
 
You must log in or register to reply here.
Top