r1100gs what plugs are you using

[alexeft]

Hmmmmmmmm, ok, maybe for most engines, but for my 1100, single electrode sparkies made most of my surging problems go away!!!!!

I couldn't believe that either. Note that my old sparks were not that old...

I currecntly use bosch FR5dc.
The FR6dc is the thermal equivalent of the FR6ddc but with one electrode.
I preferred one grade colder plug, as it seems to reduce low rev pinging during the hot summer here in Greece, hence it's FR5dc.

Cheers to all!!!

PS: bike has a lamdba sensor.

 

[Kenny]

Well the Autolite 3923 have eradicated most of the surging

 

[(RIP) ugg]

Yours may go bang... but my beauty goes something like this.....

Spark plugs usually require voltage in excess of 12,000-25,000 volts to 'fire' properly. Although it can go up to 45,000 volts,and they supply higher current during the discharge process resulting in a hotter and longer-duration spark.

As the current of electrons surges across the gap, it raises the temperature of the spark channel to 60,000 K. The intense heat in the spark channel causes the ionized gas to expand very quickly, like a small explosion. This is the "click" heard when observing a spark, similar to lightning and thunder.

The heat and pressure force the gases to react with each other, and at the end of the spark event there should be a small ball of fire in the spark gap as the gases burn on their own. The size of this fireball or kernel depends on the exact composition of the mixture between the electrodes and the level of combustion chamber turbulence at the time of the spark. A small kernel will make the engine run as though the ignition timing was retarded, and a large one as though the timing was advanced.




(Had to cut n paste as I never understood it )

Just like any good £50 a job hooker...

"suck, squeeze, bang, n, a good blow"


ugg

 

[sproggy]

I find it interesting (well, just a little bit anyway) that Autolite specify the 3923 for all models/ages of 850/1100/1150 while NGK recommend a number of different plugs depending upon both the engine size and the age, for example pre- and post- April '99 850/1100 are different.

Not interesting enough? Oh well.....

I'm still going to buy some to try in my 1150, though. At 99p each what's to lose - I've thrown enough money at it trying to get it to run right, what's another £1.98?

 

[JohnnyBoxer]

Just put some Autolite 3923's in and all is well...............seems a lot crisper

 

[John Armstrong]

Just put some Autolite 3923's in and all is well...............seems a lot crisper

Do you know how old the ones you took out were?

 

[JohnnyBoxer]

Do you know how old the ones you took out were?

Well, they weren't rusty

However the bike had a BMW dealer service @ 37500 in summer 2007 and they should have been changed then and looking at them, I'd guess that they were done then.....................but they were NGK and most BMW dealers don't fit those.................so

However they were quite black and sooty, so i guess the bike had been running rich and hence some surging perhaps

 

[John Armstrong]

Well, they weren't rusty

Ta

 

[JohnnyBoxer]

Well, they weren't rusty

However the bike had a BMW dealer service @ 37500 in summer 2007 and they should have been changed then and looking at them, I'd guess that they were done then.....................but they were NGK and most BMW dealers don't fit those.................so

However they were quite black and sooty, so i guess the bike had been running rich and hence some surging perhaps

Here's the NGK plugs I took out....................what's the collective wisdom?

 

[bart2181]

Here's the NGK plugs I took out....................what's the collective wisdom?

put it on fleabay quick before it blows up

 

[D6]

i use ngk iridium or brisk ,,,,,,iridiums were the only plug to last in highly tuned bikes, NO other came close, the brisks seem ok in the 1150 so ill keep usin what works

never have any probs as all my bikes are well serviced,
i think plugs are falsely blamed for other problems regularly

its like tyres, course your new uns are ace, your old uns were bald and badly profiled

 

[alexeft]

Here's the NGK plugs I took out....................what's the collective wisdom?

I'd say your TBs are well balanced.
Only the plugs are a little too dark. Running a tad rich.
Adjust the co pot perhaps?

 

[D6]

I'd say your TBs are well balanced.
Only the plugs are a little too dark. Running a tad rich.
Adjust the co pot perhaps?

agree, ...if the bike was at proper working temp,