How to mend Derbi Senda 50cc

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

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

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

please help with my Derbi terra 125?

is the battery dead?

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

derbi senda 54 plate leak?

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

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

fixing my dtr 2001 model?

Derbi Senda Wont Run When Hot?

derbi senda?

adam or bb from m?

my derbi gp1 open 50cc won't start?

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

i have a brand new 2010 derbi senda xrace ?

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

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

derbi senda indicators?

Derbi Senda Excessive Fuel Consumption?

runs fast then cuts out?

eletronic fault on my derbi senda extreme 03 plate?

how to fix my petrol problem?

2003 Derbi Senda R50 6 speed?

faring?

Which pipe goes to where?

My derbi senda 50cc keeps cutting out?

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

my derbi senda sm extreme 2007 ?

Derbi Senda 50cc?