Question about KTM SX 125 Motorcycles

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203 ktm 125sx do i mix oil with gas when i put gas in it?

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Yes you do,buy a good quality synthetic 2 stroke oil and then mix at between 32 to 1 to 40-1 fuel mix ( 40-1 is 40 litres petrol and 1 litre oil)

Posted on Sep 02, 2010


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I have a 2002 ktm 125sx how much oil does it hold

Thank you for contacting FixYa with your inquiry.
KTM recommends .7 Liters Motorex Top Speed 4T15W50 for the 125SX.
Let us know if we can be of further service.

Kind regards,

Jun 20, 2011 | 2002 KTM SX 125

1 Answer

Could you tell me what the ratio is when you mix the oil into petrol on a 125sx 2005 model

The long standing ratio is 32 to 1. Thats 4oz 2 stroke engine oil to 1 gallon of fuel. Some new oils say 50 to 1. Personally, I would stay with 32 to 1. I like to play it safe.

Mar 31, 2011 | KTM SX 125 Motorcycles

3 Answers

My ktm 125sx is leaking fuel from the hose.. its where it holds the fuel after the fuel tank. i dunno what the part is called. it seems like when i turn the fuel on to the carburetor (the on/off fuel...

I would get a new hose and clips and replace it. It should be a fairly straightforward job unless there are things in the way.
The fuel hose is usually 1/4" bore neoprene rubber.

Feb 16, 2011 | 2002 KTM SX 125

1 Answer

Ktm 50cc 2 stroke selfmixer can i jus mix oil gas put in 2 tank instead of the selfmixer

Yes. If you look around, you might be able to get a kit to eliminate the oil injection pump.

Apr 15, 2010 | 2003 KTM SX 250

1 Answer

I dont know how to check the transmission fluid level on my ktm 125sx

most transmission fluids on motorcycles are topped up until it is full if it has a side filling hole (stars to run out of side) with motorcycle level (like on ceneterstand). a top filling hole will have a dipstick. basically you want the gearshafts half submerged in oil.

Jun 14, 2009 | 2004 KTM SX 125

1 Answer

How much oil per gallon of gas

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!

May 05, 2009 | 2004 KTM SX 125

2 Answers

Tyre pressures and oil grade.

gearbox oil-20w/40 0.73 qts. cooling system-1.26 qts. 50/50 mix 2-stroke oil-shell racing x/40 fuel grade-98 spark plug-ngk r 6918-b8 spark plug gap--.024" main jet-190 idle jet-48 needle position-3 pilot screw # of turns out-1.5 rear tire pressure-14 lbs front tire pressure-14 lbs keep air filter element well cleaned & oiled w/ air filter oil.there are service manuals available for this model.

Feb 18, 2009 | 2003 KTM SX 125

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