20 Most Recent 2005 Derbi Senda SM 125 4T Questions & Answers

There are several schools of thought on this. Some say you should change your oil every 3000 miles; others say every 6000 miles is fine. In any case you should change it every 3 months.,

when you start up the bike what is the tacho showing

screw it all way bk in and bk it off 1 and half screw if you no what i mean

Hi, you are correct the overflow pipe on the bottom of the carb allows fuel out of the carb instead of it flowing into the engine, you will have to remove the carb and clean it out, sounds like the float needle valve has become contaminated by old fuel which has been standing in the carb, common on motorcycles which have been stood up for the. Winter etc a varnish or sticky substance may be found, clean this away making sure the carb is scruplesly clean inc jets before rebuilding

Hi
Decarbonise the exhaust system.

Regards
Phillip

I know you said you cleaned the carb, but maybe something got in the carb when trying to start the bike. Because it sure sounds like you have a clogged pilot jet.

Fixya is unable to source parts.

One of these. You buy by make and model, not by size. https://www.google.com/search?q=2008+derbi+terra+flywheel+extractor.

What state is the battery in? Fully charged? Did it work before the overhaul? Check your wires again from top to bottom

Use a airlift or comparable coolant system air removal/refill system.You attach the unit to the coolant system filler and it vacuums all air from the system,then you use the supplied hose to return the coolant into the vacuumed system.This fills the system with just coolant and no air.

cycle oil..30wt..or car