dont know if many people knows about runners vs 125? but... was working perfect. went to college, went to go home from college and it just wouldnt start. we had a little rain that was about it. i drained carb no water or crap in there, and even tryed easy start into my inlet thinking it would fire it over. every now and again when winding it over it would get a spark and backfire? dont know if there is any common faults or out? i aint looked at it yet. too late and wet. lol
sorted now, sprayed all the electrics with electric cleaner spray. and then fitted new plug, old plug was still sparking so... then decided to do an oil change and noticed i actually had very little oil in my engine, aprox quater of a pint. if that! and then hoyed a car bettery on the jump leads n it fired straight over. no clue what it was.... but hoy ho .
I got this exact same problem right now lol where abouts did u spray the electrics an did u do anything else I changed plug for new one an checked it was sparking drained float bowl an pet seemed fine no junk or anything in there an kept tryna start it an back fired once aswell would love to hear from u I got contact cleaner aswell an news to get the bike running again asap
yeh worked out it was spark plug gap incorrect. simple as that. standard they set the plugs to 0.7 changed it to 0.8 and runs sweet.
