Fork oil capacity

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: what size is a derbi gpr 125 piston seal kit?

GPR125 '05 model engines have a piston of 56mm diameter

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SOURCE: i want to have more horsepower

Hey. Replacing the stock cam with a performance camshaft will help. To gain more horsepower you should also make the airflow to the engine better. Replacing the stock sylinder with a big bore 150cc kit will sure make the engine more willing. The engine on a 08 Derbi senda baja model, is the same engine that you will find on a Yamaha TTR 125. So that is what you should search for. Hope it helps:)

SOURCE: my derbi senda 50 pro

first have the head trued at a machine shop then get new head bolts, clean mating surfaces spotless with a non residue cleaner such as brake clean DO NOT TOUCH ANY SURFACE AS YOUR FINGERS LEAVE DEPOSITS that includes the gasket, torque to manufacturer spec with lightly oiled bolts,