Derbi senda 125 repair manual - 2004 Derbi Senda SM 125 4T

SOURCE: Drain and change oil

I can't tell you all the particulars from the limited amount of pictures of your bike. -Remove the oil drain bolt on the bottom of the crankcase (the universal bolt size for bikes use a 17mm wrench). -Drain the oil (remember to recycle). -Re-install the drain bolt with a new sealing washer if necessary. -The oil fill cap should be some where on the top of the crankcase. About 1 or 25mm in diameter with a raised tab for turning. -Fill with recommended oil. -There are 2 ways to check oil level on dirt bikes: 1) Oil level check bolt. On the right side cover. 2) Oil level site glass. A 1 round piece of glass on the side of the crankcase. Usually by the kick start & R brake lever. -Always check the oil level with the bike upright (as if you were sitting on it). -Check bolt - fill with oil slowly until oil comes out of the check bolt and re-install it. -Sight glass - fill with oil to cover 3/4 of the sight glass. -Remember to hold the bike upright when adding oil.,

SOURCE: torque settings for derbi gp 125

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SOURCE: clutch and pistonring

on the internet.

SOURCE: 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.

SOURCE: MY SON HAS DERBI SENDA AND SOMEONE HAS MESS WIRING

The problem is that one of the bulbs has blown or you have a bad earth connection on one of the black wires coming from one of the indicators,clean connections with wet and dry sand paper. Finally check the wattage of the bulbs is correct something like 3-5 watts ,

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