How to mend Derbi Senda 50 Xtreme

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

i have a brand new 2010 derbi senda xrace ?

2003 Derbi Senda R50 6 speed?

My derbi senda 50cc keeps cutting out?

how do i open the valves fully on my dtr 125 02 model?

Derbi Senda Wont Run When Hot?

Derbi Senda Excessive Fuel Consumption?

derbi senda?

my derbi senda sm extreme 2007 ?

i have a derbi senda 50cc, on starting it revs straight up to 900 rpm. ?

My derbi senda has orange spark and won't start ?

derbi senda 54 plate leak?

Which pipe goes to where?

Derbi senda , no fuel coming through the pipes from the tank to the carb?

how to fix my petrol problem?

adam or bb from m?

Derbi Senda 50cc?

please help with my Derbi terra 125?

how can i fix my derbi senda x-treme indicators?

runs fast then cuts out?

derbi senda indicators?

how to reset the service light on my Derbi terra 125?

my sons derbi 50cc bike was going yestewrday then it started to smoke a bit?

is the battery dead?

fixing my dtr 2001 model?

petrol is pushed through the exhaust port on my derbi senda 06?

eletronic fault on my derbi senda extreme 03 plate?

my derbi gp1 open 50cc won't start?

faring?

how can i get my head bolts out they have snapped ? derbi gpr?