Question about 2004 KTM SX 125

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The year of the bike

How can you tell the exact year of your new ktm 125sx its year is between 2000-2005?

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Give the serial # to a local dealer they should be able to tell you

Posted on Nov 10, 2008

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Hi ave got a ktm 125sx 02 its just had a bottom and top end rebuild bike starts and runs great but there is still a rattle from the engine could anybody help thanks


Lots of engines make characteristic noises and air-cooled 2-strokes have lots of characteristic noises even when new and even when there is nothing wrong.

If you have just spent a parcel of money on it your first port of call should be to the person or dealer who carried out the work. Having a top and bottom overhaul means a world of different things to different people. If you don't know what has been done and what needed to be done you will be somewhat in the dark and at a disadvantage with perhaps unrealistic expectations.

Perhaps the engine hasn't had as much of an overhaul as you thought. A full bottom end overhaul is a good deal of cash and lots of work that would make it as good as a new engine again. Maybe the dealer decided for reasons of economy to refit some of the old parts instead of replacing everything.
I suggest you read your invoice and then go and ask some leading questions.

Apr 02, 2016 | KTM Motorcycles

1 Answer

I've got a KTM 125sx 2002 I've done a top end rebuild piston etc and put a new coil and plug on it and the bike won't start with the kicker, only with a bump start took the plug out and its got a weak


Hi, Ian and the usual suspects are:
1. Fouled spark plugs.
2. Discharged battery, check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Loose connection at ignition coil or plug between ignition sensor and module.
4. Spark plug cables in bad condition, shorting / leaking, spark plug cable connections loose.
5. Faulty ignition coil or ignition / electronic module
6. Failed CKP, CMP, or BAS sensor.
7. Faulty ignition switch.
8. Security alarm failing to disarm needs reset
For more information about your issue and valuable free downloads that you will need please visit the websites below. Good luck and have a nice day.
125sx won kick start please help me KTM 2 Stroke
ktm 85 sx no spark
1999 2003 KTM 125 200 SX MXC EXC Service Manual Moto Data Project

Feb 23, 2016 | KTM Motorcycles

1 Answer

Ave got a ktm 125sx 02 bike wont start with a kick but will start with a bump easy and ave chanced the coil plug and ht cap and when running has plenty of power and got compresson any ideas


unfortunately the most cmmn cause for a bike not starting ff the kick start but starting with a bump is being too low on compression,although to you foot it may feel like enough it does need to be nearly 100% as high as it should be to kickstart.the easiest way to check the condition of the piston is to take the exhaust off and look up the port in the barrel ,it is usually the exhaust side of the piston that gets damaged as it gets hotter.good luck.Adam

Oct 24, 2015 | KTM Motorcycles

1 Answer

My sons 2004 ktm sx65 jumps out of neutral and makes a slight grinding noise?


I have the same problem with my 2006 Ktm 125sx! I am in the process of taking it apart did you find out what the problem was?

Apr 28, 2012 | 2004 KTM SX 125

1 Answer

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,
TF

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

1 Answer

Need manual would like to download it ktm 125 2009


www.ktm.com
Choose your model and there is a tab for "Downloads", most I looked at show back to 2008, so your 2009 should be there. The 2009 125SX manual is now listed under the 2011 150SX, I assume this is what you have.

Feb 28, 2011 | KTM EXC 125 Motorcycles

1 Answer

2005 ktm 125 engine is froze up


Sounds like a major broken bike!
What i do, is remove the gear that runs between the crank, and clutch to see what end is frozen, the transmission, or the engine.
You can also take off the exhaust pipe and look in the hole for damage.

Nov 04, 2009 | 2005 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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