SOURCE: Derbi Terra 125 problem with the front brake:
Hello, Never dealt with motorcycles, still if you are sure that there is no air in the brake liquid, check whether the braking disk/pads are not hooked or (irregularly) worn-out. If this is not the case, replace the braking mechanism (the cylinder which pushes the pads), if too expensive, clean the old one and reassemble with new rubber parts. Please let me know whether I was able to assist.
SOURCE: I have a 2008 Derbi
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
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