I'm having problems with my Derbi senda 125sm, at first the bike will start fine and tick over without trouble, but after about 15 minutes of riding the bike will cut out and will not start with the electric start and will have to be bump started, and this bike does not have a kick start and then proceeds to cut out every 3-5 miles. need help ASAP thanks.

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: clutch and pistonring

on the internet.

SOURCE: 50cc 1999 derbi senda

Hi
Decarbonise the exhaust system.

Regards
Phillip

SOURCE: I have an 04 RMZ 250 I just re-shimmed the valves

sounds like maybe valves were shimmed too tight,check service manual for clearances...better a little loose than too tight,can cause alot of damage to cam & head,be careful!!

SOURCE: fitting back kick start spring mechanism derbi

Hi I have a derbi senda sm 2005 Just brought a kickstart shaft but carnt rember how to fit it n how the springs go If any1 can help please let me no