my derbi senda's spark plug turns black after one run? plz help?

tbh mate it is doing this probably because you have put to much oil in it when to much oil goes into a bike it will come out black and wet thats what i think but also i could be you are workin it at a high speed so the spark plug will turn black!

gavin
June 2009

hi mark, have you been driving your bike off road? coz it sounds like your problem could either be a blocked or dirty air filter which will need replacing or cleaning depending on which type it is. while you have the air filter out look into the carb, open & close the throttle to make sure the piston inside the carb is going up n down & not stuck open. finally check the choke mechanism is not sticking in which case you will need to take it out, clean it & make sure it opens & closes properly. try those things for starters & see if they work. hope that helps.........happy motoring.

steo
June 2009