Which spark plug?

[Dave Brick]

I'm putting on new spark plugs on my 1992 60 hp ELENE.

The owner's manual lists QL77JC4 @ .03 inches as the recommended plug, with L77JC4 as the aleternate.

I bought the engine rebuilt by a very reputable dealer, and the L77JC4 plugs are in there. It runs fine. Do any of the really smart people here have any opinion on QL vs L plugs....and why?

BTW, I will be purchasing the plugs (and some other stuff) from iboats, because I support businesses which are helpful to me.

 

[wilde1j]

Re: Which spark plug?

Either is fine. The 'Q' plug has RF suppression, which may help if you have any interference with electronics on board.

 

[Haffiman]

Re: Which spark plug?

Most countries have legislation demanding use of non-radio interference plugs type 'Q' if staying with Champion brand. Not only may your radio equipment on-board get disturbance, but everyone around you as well. Even if a bit more expensive, stay with the 'Q' plugs. As for engine performance, no difference.

 

[F_R]

Re: Which spark plug?

Agreeing with both of the above replies, but we should point out that a few late model motors want the "Q" because the igniton system likes them better.

BTW, the Q means it has inductive suppression.....not the same as resistive ("R") suppression plugs.

 

[Dave Brick]

Re: Which spark plug?

Thanks everybody!