i have a derbi senda and two weeks ago the bike would start and run for about 2 days and then wont start. i take the spark plug out and its black and soaking wet. ive brought a new plug but the same happens and now it want even bump start and stinks of petrol when u try and bump it ..the spark plug is also soaking in petrol and black ....can anyone help me plz???

mark foxall, June 2009

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