OIL CAPACITY ON KTM 125 SX 2006 - 2006 KTM 125 SX

300ml gearbox oil

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Capacity - Transmission Oil Gear Oil (All 125/150 Models) 0.70 Liters (0.74 qt) Engin Oil 15W/50)
Guideline Use High quality 2-stroke engine oil of a well-known brand. KTM recommends Motorex products Su[plier Motorex - Cross Power 2T
This service manual information link might be helpful: should be same for all years. http://www.ktm.com/uploads/tx_ktmproduct/techdocs/6101L0_34254324.pdf.

Standard bore is 54mm. It is a Nikasil(coated) cylinder that cannot be overbored to correct for wear.

try changing the oil,
had the same prob seem to work, dont know why,
may be due to water.

.7 liter

5 litres of petrol 90ml of 2 stroke oil
the best for engine and high performance

Consult your owner's manual or visit a dealer. They won't charge you for these info.

I would think the it is all one unit, motor oil lubricates that as well.

Look into your power valve. If it doesn't operate freely, you won't get peak performance. They can get gummed up.

A fuel mix of 32 to 1 is the standard. That means 4 ounces of oil to one gallon of gas. Be sure to use two stroke engine oil in the gas. DO NOT use motor oil. 10w40 motor oil is for the gearbox.

A top rating would be nice. Thanks!