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Showing content with the highest reputation on 7/26/2018 in all areas

  1. Llama Fellow Brit, but living in the US, those plugs don't actually look that bad!, they absolutely should be changed, and you have something wrong with your fueling, could be as simple as bad petrol supply, air filter needs to be checked, here is my theory, I use it on three items, inner tubes, air filters and spark plugs, they are all inexpensive items, it's not "worth" trying to save them! it is easier to load in new ones, than "clean" the old ones. So the center electrode looks like it's pretty good, they should be a nice biscuit brown, (think McVities Rich Tea) the soot you have on the threaded section, suggests to me that you are running rich, but your plug is about the right temp, so drop in a couple of new plugs, drop in a new air filter, (run that tank of fuel out before you change the plugs and filter), change the oil and filter, fill up with "Quality" fuel, go for a ride, and in about 500 miles, pull a plug and see if the front and rear plug look about the same or better. YOU may have an air leak if the bike is "surging or stumbling" at idle, (which would cause the fuel system to add fuel to combat the lean condition), but start with the simple stuff, (filters, fuels and plugs) set a known baseline, when you end up back at the start, time to get into the expensive parts. Good luck.
    1 point
  2. Those plugs look like they are running in a fuel rich environment. But, then again, you said you have been doing a lot of stop and go city riding, which could also make them do that. Since you have put the stock mufflers back on, I would try a new set of plugs at the same time. If the problem then goes away, that would indicate a couple of possibilities. One possibility is the plugs were at fault, and it was just time for new plugs. . The other is that the aftermarket mufflers are causing your bike to run rich. If the bike runs fine with new plugs and the stock mufflers, you can then switch back to the aftermarket mufflers. If the problem returns fairly quickly, that would indicate that the bike needs to be tuned to the aftermarket mufflers. Ronnie
    1 point
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