20 Most Recent 2000 KTM EXC 125 Questions & Answers

dirty pilot jet, remove it and clean it.

all the discs and plates should be the same size did you by a new clutch?

the kick start mechanism sound like its jamming or the spring has come out take the cover off and inspect the spring if spring looks ok just replace the mechanism get back to me buddy

ya man get a yz125 i have an 07 and have put 80 serious race hours on it and i have had no problem with it. i havnt even had to tear the engine apart yet.

im not sure, but i know that a lot of bike with aluminum pistons will knock when its cold because the aluminum piston hasn't heated up and expanded in the cylinder yet... but if it doesn't go away when its warn then all i can figure is maybe the lower end needed to be rebuilt too.

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.

http://freemotorcyclemanuals.blogspot.com/search/label/free%20motorcycle%20repair%20manual  

 

this is a free maual  ..just click on this and download manual

Make sure it turns over freely. Clean spark plug. Check air filter is clean and sound. Strip and clean the carb. Change the oil or at the very least, check the level is correct. Flush to tank (with new fuel) to get rid of any old fuel. and make sure the fuel tap flows fuel correctly.

That would be like riding a fixed wheel bike.Think about how you will stop and start. Only hydraulic fluid will leak. Bad idea!

Question edited for clarity. That sounds like it is just a bad connection somewhere or possibly a bad switch. Remove the battery leads and clean the lead contacts and battery posts with a wire brush. Smear with Vaseline and reconnect. Remove the starter leads and do the same. Then it could be the Starter Relay https://www.google.com/search?q=ktm+450+sx-f+starter+relay+location Or Starter Button https://www.google.com/search?q=ktm+450+sx-f+starter+button+replacement ..

personnaly I would replace cylinder with new OEM

All dirt bikes have a VIN. It is on the steering neck. https://www.google.com/search?q=vin+on+my+ktm+300 ..

Have you checked battery connections. Run switch in the correct position? Checked spark plug for debris? Just thinking out loud..

Drain oil. Use degreaser to clean area. Use JB Weld & allow to set up properly before adding oil.

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Hi, try to see this link and looking for the manual that you need. https://www.pdfmotomanual.com/manuales/ktm/eng I hope to give you an help. Luca

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Hi, most likely your cdi unit or ignition coil needs replacing.

took me a min or two of WTF-ing to see pic and realize you meant a 2-stroke motorcycle..

try replace spark plugs

It's a bad seal of the head gasket. You need a new head gasket and to scrape every particle of debris from the cylinder head and cylinder surfaces that mate with the head gasket. Use the factory specified gasket sealing compound and do a clean job - no blobs or pools of the stuff. The head gasket should lay flat on the surface of the top of the cylinder, and you have to make this surface free of grit, leftover sealant and any other foreign matter before you put the head in place and torque it down. Start with the head bolts just finger tight and then go by the manufacturer's specs for the pattern and amount of torque to be applied. Usually it is recommended that you get to the specified torque amount in stages, going around several times and repeating the torque pattern until you get that maximum rated amount. This will prevent the seal from shifting or warping and should make the gasket seal perfectly. This is the old school method of doing this job. and I have never seen this fail to produce good results. Take your time, be clean, and you will have the results you want.