This came out of my friend's GSR. Naturally aspirated, no bolt ons... 100% stockers. Bout 113k miles on the motor, but i dont know the last tune up.

ANYWAYS... whats up?

 

kinda looks like ash deposits....usually caused by oil & fuel additives

or maybe it's just carbon deposits......this would most likely be the case if the car ran beyond it's recommended ignition maintainence/tune-up.

 

How many miles were they in the car, and what type of fuel does he run?

 

Was he running salt water through his engine?

 

looks kind of like the stuff i cleaned out of one of my carbs.

 

definitely not carbon deposit, I think it is ash deposit as well.

 

I'de like to know if your friend used fuel additives, and if so which one.

"Light brown deposits encrusted on the ground and/or center electrodes indicate ash deposits. This situation is caused by oil and/or fuel additives. When the deposits are found on only one side of the spark plug core nose, it is usually considered to be a problem with the cylinder head (valve stem seals or valve guides). When they are found on both sides of the spark plug, it is often considered to be a problem sealing at the piston rings. This condition can mask the spark and, in some cases, contribute to misfire. Check for worn valve guides and valve stem seals and/or piston rings. The spark plug is the correct heat range and was a victim of the engine's condition, not the cause of it. We does not recommend the use of fuel additives which leave deposits on the core nose of the spark plug."

From this page:
http://www.nightrider.com/bike...k.htm

It also looks like it was in there to damn long, hard to tell if it's ash or not.

Cheers,
Roy

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rapid_roy &raquo;</TD></TR><TR><TD CLASS="quote">It also looks like it was in there to damn long, hard to tell if it's ash or not.

Cheers,
Roy</TD></TR></TABLE>

Yeh that was my guess... But none of the others looked like it I have no idea how long its been since the last tune up

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">How many miles were they in the car, and what type of fuel does he run?
</TD></TR></TABLE>

113,000 or so miles... pump gas, unknown octane

 

http://www.ngksparkplugs.com/t...ry=US