Black plugs kjet 8v

[shakeyjake]

I replaced the plugs on my 8v kjet today and noticed the tips of them are a charcoal black colour, i know this is overfuelling, although the exhaust isnt smoking so it cant be that bad. I changed the rotor arm and dizzy cap the other week but hasnt been driven since - only fired up a few times. Are there any sensors that are prone to effin up the fuel intake? The idle hunts quite abit when cold(did this before i changed cap and arm), but once warm its nice and smooth

thanks for any help

[rubjonny]

5th inj might casue problems or leaky injectors, but tbh if its running ok, starts fine and fuel economy is ok id not worry too much!

[shakeyjake]

before i changed the plugs the engine would turn over for about 5 seconds and with me giving the throttle a little tickle before it would start. I'll keep an eye on it, fuel economy i dont know about as ive never driven it

[rubjonny]

if its only been running for short bursts, this would prob cause the carbon buildup as it newver gets hot enough to burn off the carbon from runninjg a bit rich on a cold start?

[danny_p]

after cold start  plugs are allways get a light black coating  that burns off once it's warm and been driven.   reading plugs is a dark art  its amazing just how meany ways there is fo rthem to tell you the wrong thing

[shakeyjake]

I think the pair of you have cracked it. Ive only ever started it up and let it run for a minute of so since ive got my hands on it so that would explain the sooty plugs. Thanks alot for the insight