How to mend Derbi Senda Xtreme

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

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

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

i have a brand new 2010 derbi senda xrace ?

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

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

runs fast then cuts out?

my derbi gp1 open 50cc won't start?

is the battery dead?

Derbi Senda 50cc?

My derbi senda 50cc keeps cutting out?

eletronic fault on my derbi senda extreme 03 plate?

2003 Derbi Senda R50 6 speed?

Which pipe goes to where?

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

how to fix my petrol problem?

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

please help with my Derbi terra 125?

derbi senda 54 plate leak?

Derbi Senda Excessive Fuel Consumption?

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

derbi senda?

faring?

my derbi senda sm extreme 2007 ?

Derbi Senda Wont Run When Hot?

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

adam or bb from m?

derbi senda indicators?

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

fixing my dtr 2001 model?