Re: Running rich

[Pieter de Koninck <pieter_de_k@xxxxxxxxx>]

The soot is black. The bike doesn't misfire, but it does backfire occasionaly.
What I am trying to determine is why one cylinder runs richer than the other.
What part of the fuel system (or ignition) could be out of balance to cause
this?


- --- Wayne Woodruff <wayne@xxxxxxxx> wrote:

> On Wed, 1 Sep 2004 12:25:49 -0700 (PDT), you wrote:
> 
> >99 R1100R. Remus exhaust, no O2 sensor, beige Cat Code plug, CO pot.
> Motronic
> >reset after modifications.
> >
> >The right cylinder's spark plug is consistantly sootier than the left 
> >(which
> >looks OK). I assume the bike is running rich on one cylinder (the right 
> >one,
> >sitting on the bike).
> >
> >(A sidebar: this is the cylinder that broke a piston ring late last 
> >year. 
> >suspect there is a connection between that and the rich mixture. 
> >Unburnt fuel
> >blowing by the rings and diluting the oil?)
> >
> >Where should I start? TPS 0=0? Fuel injector? Would an aftermarket chip 
> >be of
> >any use? The bike has had all the usual tune-ups performed--valves, TB 
> >sync.
> >
> 
> Well, look at the symptom.  If the right plug is dirtier, than it is
> either not firing correctly,  it is getting too much fuel, or perhaps
> the ring broke again and you are burning oil.  I can't think of too
> many other causes for that problem. What color is the soot, black or
> brown?  Black is likely too much fuel, brown could be oil.  How bad is
> the soot?  Does it cause misfire?
> 
> Solve the problem before introducing more variables like 0=0 or an
> aftermarket chip.  It will only make things worse. 
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