December 31, 200619 yr just got a yz125 for playing on. when you ran it up on the spot it would bog a little like it needs cleaning out. so i cleaned the carb airbox new airfilter etc and went out 4 a little play. it was still doing the same thing sometimes it would run real clean for a little bit then bog up again. i slowed down to stop and it really did bog up then and just died and had to push it all the way back i think its fouled the plug but what would be the reason for this. im using motul fully synth 40:1 any ideas??? Cheers james
December 31, 200619 yr Author further inspection it has made the plug refuse to spark anymore so i put a new one in but it still runs the same???? any ideas guys
January 24, 200719 yr It sounds as though the ignition may be weak. Probably the stator, magneto, charging and source coils under the flywheel. They are the most common to go out. Also be sure you are using a resistor spark plug. The digital ignition does not like a lot of RFI. Paul
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