Look at this plug...

[P Dubya]

One side of the plug looks pretty decent... Other side looks rich. Any ideas on how this happens/what causes it?

 

[kiwigtx]

One side of the plug looks pretty decent... Other side looks rich. Any ideas on how this happens/what causes it?

View attachment 1904616

Try installing it on the opposite side of the engine - it should clean up.

 

[Geoff 2]

The centre electrode is getting fuel wash on the grd strap side.

 

[Cranky]

One side of the plug looks pretty decent... Other side looks rich. Any ideas on how this happens/what causes it?

View attachment 1904616

Try installing it on the opposite side of the engine - it should clean up.

Does anyone worry about clocking their spark plugs?

 

[RTDaddy]

Does anyone worry about clocking their spark plugs?

I use a sharpie to mark a line along the plug body to indicate the "open" side of the electrode, then install plug with open side facing up into the combustion chamber. Sometimes have to go through 2 or 3 sets of plugs to index them all.

 

[kiwigtx]

Using Iridium plugs will render indexing useless and a waste of time.

 

[Bird 426]

Summit sells thin washers for spark plug indexing.

 

[Cranky]

I use a sharpie to mark a line along the plug body to indicate the "open" side of the electrode, then install plug with open side facing up into the combustion chamber. Sometimes have to go through 2 or 3 sets of plugs to index them all.

What Bird 426 said below.....

Summit sells thin washers for spark plug indexing.