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2006 Derbi Senda SM 125 4T Questions & Answers
Engine not running
Your carb should have another jet. What you cleaned was the main jet in the center of the carb. There should be another jet called a pilot jet. Often it has a metal plug covering it up so the setting can not be changed at that point. Instead, they want you to change the setting with the pilot air screw. In each case, if you remove the screw, count the number of turns for removal and put the screw back the same number of turns.
The pilot jet controls the idle. It picks up gas from the float bowl then the gas gets metered by the jet and the air screw then passes through a circuit (drilled passageway), in the carb casing and comes out in the center of the carb close to the needle jet. You will need to get the jet and circuit cleaned.
Chain
Put it up on your stand lossen the axel and remove the bolt on the bottom of the shock.
Then tighten your chain and lift your swingarm up until its horizontal with the ground, then the chain should have almost no play. Not completely tight, but almost no play.
Tighten the axel, and the bolt on the shock, and your set,,,
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
My Derbi City Cross will not start
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.
10/21/2022 3:56:02 PM •
Derbi...
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Answered
on Oct 21, 2022
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