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Plugs going bad, why?

  • Thread starter Thread starter Anonymous
  • Start date Start date
The base being blackened in only a few minutes indicates a too-rich mixture. If the bike seems to run fairly well, and the rest of the plug is fairly clear, the explanation may be as simple as a sticking choke or that you are keeping it ON for too long.
 
Ron is probably correct about excessive choke being responsible for the threaded base of the plugs being blackened considering the center ceramic is burning a brown color.

Once the bike starts and stays running with the choke on, if the ignition system is up to specs, (voltage and timing) and the carbs are synchronized correctly and there are no air leaks in the induction system, you should be able to push the choke to the off position in less than ten seconds while slightly opening throttle to maintain rpm until the engine is warmed up enough to idle smoothly at about 1200 rpm all by itself.
If everything is right, max of ten seconds of choke, hold the throttle slightly open for about 30-40 seconds and after one minute, it should idle hands off and you should be able to ride away. This is why I suggested you verify other things besides just cleaning the air filter. It is rare that there is a single cause for a problem. Usually, it is a combination of small things that by themselves would not be considered cause to bother with.
Little things add up. AGAIN, when setting up/tuning, the LAST thing you touch is the carbs because if everything else isnt correct, you can play with carbs until youre old and grey and you will get no where.

Earl



HootiHoos said:
For now, it is easier to replace the plugs. I will isolate and elliminate once I get a manual. I know that reading the plugs refer's to the ceramic electrode, but the base of the plugs being black after a few minutes of operation? That's a problem. However, the ceramic is lightly browned and the bike has ran fine now for 6 days, so maybe the air filter did the trick. I would be amazed if it did. I will keep yall posted and let you know when it fails to start. Thanks for the replies though, at least someone is trying to help. I think I am going to order a manual right now. I wish BikeBandit was a little faster with their shipping. It takes them 3 to 5 business days to ship even on express orders. There must be another company out there with our parts that ships a little faster. Oh well, at least SOMEBODY has our parts!
Click to expand...
 
One tip here on your plug problem. Check your plug boots. They have a brass plug inside that is threaded and they do get loose. Had a similar problem on my 81 1000 and that was part of the problem. I got real smart and bought some new NGK boots...but they were 5K ohm and now it doesn't fire hard enough to start. After 22 years, wires and plug boots have a tendency to be bad. Look em over.
 
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