toetoe Posted July 3, 2014 Report Share Posted July 3, 2014 Hi, I have had some trouble with my spark plug going black after just a few hours of riding,And the bike sound fine when I start to rev it but after it gets so far it sounds like a bag of nails, I can only explain it by saying it sounds like the choke as been left on or as if the exhaust is blocked, if that makes sense, this has been like this for a few months now but it's slowly got worse so what I thought I could do is ask you guys for any information that you know that can cause it to happen, I went to kevs practice day a few weeks ago and he suggested that it could be time to replace the piston and rings but I didn’t ask him why he thought that, I’m not disagreeing with him as my knowledge is very limited compared to someone like kev so could someone explain why it could be the piston and rings causing it, I thought that the more answers and ideas I get the better, this way I can just tick each one off the list if it doesn’t work. Today I decided to see what youtube could offer me and although a lot of the stuff on youtube is incorrect there is some very useful info, I clean my carb very regular but by watching youtube today I haven’t been cleaning it very good at all and after putting my bike back together after cleaning the carb, air filter and putting a different plug in, it did run really nice but that’s just in the back garden on tick over were as I need to ride it up a bank to know if it as done any good or not, also while putting it back together I noticed that the carb to airbox Rubber inlet manifold was a bit perished, it didn't look like their was an hole in it but i'v ordered one, it should be with me bye monday, so any help would be greatly appreciated. kind regards Tony Quote Link to comment Share on other sites More sharing options...
lineaway Posted July 4, 2014 Report Share Posted July 4, 2014 Remove and clean the head. Have you ever jetted the bike. Also fuel and oil play into this, as well as an over oiled air filter. Quote Link to comment Share on other sites More sharing options...
0007 Posted July 4, 2014 Report Share Posted July 4, 2014 I would do a compression test first before doing anything Also check your spark plug cap resistance or failing that just replace it Quote Link to comment Share on other sites More sharing options...
toetoe Posted July 4, 2014 Author Report Share Posted July 4, 2014 Remove and clean the head. Have you ever jetted the bike. Also fuel and oil play into this, as well as an over oiled air filter. great, this all sounds like work i can do myself, the over oiled air filter is a strong possibility, i didn't know that i could over oil the filter. Quote Link to comment Share on other sites More sharing options...
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