Question about 2003 Yamaha YZ 125

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So i was wondering i changed the spark plug on my bike including all oils, also included a costume yamaha fuel filter bike started fine rode it. Than second time i started it i forgot to turn gas line on..(my mistake) but i noticed as bike was turning off i turned valve on quicky as possible and bike bogged out would not start. i took sparkplug off agian and it was really oily black so i changed it agian..why did my spark plug give out like tht so quick and does it have to do with my new costume fuel filter and my human error..?

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Hi, the problem is that your bike is running to rich( to much fuel from carb to engine) so its the un-burned fuel mix that your seeing on your plug and thats fouling it out......now this is caused by either to rich of fuel mixture(you should be mixing 32:1) or you need to rejet carb so it delivers less fuel to engine... your carb has a jet in it and the # is stamped on it ( if you take the carb off and remove the bowl( 4 screws) you will see it,it will have an octagon shaped head.) for example if the # on it is 55 then you need to go with a 53 or 54...... also a good sign you need to rejet with a smaller jet is your bike will spooge(leak) a black oily residue from exhaust pipe and muffler( same residue thats fouling the spark plug.)

Posted on Sep 27, 2010

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