One plug is sooty

[Ian]

R1100RT with 27K miles - 250 miles ago I fitted a new pair of NGK 2164 BCPR7ET plugs.

 

Yesterday during my valve clearance adjustment I noticed that the throttle side plug was sooty but the other side was the usual tan colour with no soot.

 

A Zero-zero sync was carried out at the same time as the plugs were changed but I mistakenly set my valve clearances too tight mistakenly believing that feelers were Imperial and not Metric which they were.

 

What might be the cause of this single plug problem?

 

regards,

 

Ian

 

[philbytx]

Ian, RH side running richer/cooler than the LH side could be due to your valve clearance issues. Perhaps the RH side being tighter than the left. I did some research after my initial post - Please seee below!

 

I did not readily recognize that NGK plug type you are using, so I checked the NGK website and they specify

the BKR7EKC-N (stock #2095) Gap 0.032. This is the plug I use in my both my R1100R and R1150RT.

 

The plug you are using is the same heat range but IS structurally different. It has a projected insulator and

is a 3 ground electrode instead of a 2 ground electrode and does not have the low angle ground electrode as the BKR7EKC-N.

 

 

 

[Ian]

Phil,

 

I have just finished stripping out and cleaning both throttle bodies. Surprising amount of oily crud on the air box side of the flap but clean on the exit side. The was no discernible wear on the flap spindle.

 

On the TPS side There was a tiny stone between the bowden cable inner and the cam cable channel so I'm hoping that this is why I was getting inconsistency in the 380mv TPS reading.

 

I used these plugs as they were equivalent to the old discarded plugs and like them one step hotter than FR6.

 

Now I'm off to get out my pair of vacuum gauges and annoy my neighbours

 

regards,

 

Ian