highrider Posted September 23, 2007 Share Posted September 23, 2007 hello i have a yz 125 2 stroke dirtbike and i have never rebuild an engine before but i did this summer put a new stater and flywheel in all new seels gaskets piston ... it worked out great had a really nice ride for about 3 hours last week then the sparkplug was burnt out it was black on the bottem but not to bad this weekend i put a new plug cap on because the old one was a little cracked but i went for another 3 hour ride and it happend again i was told at my local yamaha dealer that it might be the carb jets does anyone know how i could find out how to set them the right way or if thats even the problem??? Link to comment Share on other sites More sharing options...
yoda Posted September 23, 2007 Share Posted September 23, 2007 Apart from a whole host of other fuel/air ratio problems, you might be running a too hotter spark plug. Go for a cooler grade and then find out what colour it is. The higher the number, the hotter the tip. Link to comment Share on other sites More sharing options...
highrider Posted September 29, 2007 Author Share Posted September 29, 2007 ya i just go into the store and tell them the make and model of the bike and take what they give me i tried the 10 $ plug and the 4 $ one both didn't work i'll have to find out tho thanks Link to comment Share on other sites More sharing options...
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