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Black Spark Plugs

A

Averb

Tuned and Synch'ed
Joined
Dec 1, 2009
Messages
79
Location
Sydney Australia
Okay, thanks to John and Tony I've fixed the high idle - first the cab cleaner then the 'trumpet oil' but now I have one black spark plug, the left one. I've changed plugs, swopped the coils (as I've fitted new, second hand coils) and leads. I've reset the tappets, balanced the TBs and reset the the TPS a couple of times. Any suggestions?
Steve
 
Compression test and swap the injectors.
You could have rings leaking or an injector sticking.
Leaking rings can reduce compression and allow oil in.
A sticking injector can cause over fueling.
Both of those could lead to a black plug.
 
I'm with Mike, but I'm betting on a clogged injector. Have them professionally cleaned by RCEng.com or similar.
 
They should be easy enough to swap and see if the black plug moves with the injector.
 
Injectors cleaned and the fuel consumption has dropped from 9l/100km to 6.5, bike running really well.
Thanks for the help
Steve
 
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