20 Most Recent 2001 KTM SX 125 Questions & Answers

ITS THE CARB!!! -- take it to a qualified professional and have them clean and set the carburetor!! If you put the power valve in wrong, they can fix it too!!

A left crankcase half would probably be a problem even if you found one. The L and R center case on all bikes are matched sets. Slight differences in production can easily create a mis-match. It would be a bummer to purchase a Left case then find that a gear shaft binds up whenever the case screws are tightened. I have seen it many times. Your best bet is to find a used gearbox and either try to use it after checking the shifter prior to mounting in the frame. If it looks like the shifter has problems, put the guts of your old ****** into the new case. I would suggest that you use the output shaft from the new ****** since yours took a beating bad enough to crack the case. Selling for parts is a bad idea. Selling as a project bike is a much better idea. How about using it as a trade-in?

Thank you for contacting FixYa with your inquiry.
The following link will take you to a good source for your parts requirement:
http://cyclehuttktm.com/FicheFinderNew/FicheFinder.aspx
#1 52330000044 Superceeded Engine Case Cpl.w.tran.bear Look for Part Numbers 31007107001 50330000050.50330022000.503330 Another source: http://www.bikebandit.com/sem/ktm-parts?WT.mc_id=2676712&WT.srch=1
Or Motorcycle superstore: http://www.motorcycle-superstore.com/2/10/213/19924/PDEPT/Dirt-Bike-Motocross-Engine-Parts-2001-KTM-125-SX-Parts.aspx
Sometimes these people will be parting out a 125 SX: http://www.powersportswarehouse.com/fiche_select1.asp?cat=Motorcycles&mfg=KTM&gclid=CPb2ka7s0aoCFYjsKgodZQoh0Q
Hopes this helps you locate a case half. It's a pretty common bike and popular bike. There are a bunch of them out there, mostly in service.
Kind regards,
TF

a good weld shop can fix that with a price mind you. The best thing would be to replace it. you'll have to split the case to have it welded so why not just replace it. don't forget the seals and check the bearings.

dont put transmission oil in the motor! transmission oil goes in the transmission.. isnt there a dipstick?

buddy this is fine brilliant compression there ment to be from 100-185psi tops if below 100si bye to rings buddy

Is the igintion switch tight to spin 'on' with the key?
If so, use some graphite powder and a little WD40 to tht switch..

Google " service manuals ktm "
or try your local library. Often guys will donate manuals to the library. Also try www.repairmanuals.com See if the dealer can get you one.

here is a website link for yours owners manual
http://www.repairmanual.com/motorcycles/2002/36/0/12714/13416

Put it up on your stand lossen the axel and remove the bolt on the bottom of the shock. Then tighten your chain and lift your swingarm up until its horizontal with the ground, then the chain should have almost no play. Not completely tight, but almost no play. Tighten the axel, and the bolt on the shock, and your set,,,

Give a better description and/or some pics so I can understand what you are experiencing bud.

is there a spark at the ht lead cap , remove cap and test again ? plug or cap can fail !

release water undo hoses remove holding bolts

You will need to slightly loosen the line where it goes into the master cylinder,...then squeeze the lever and hold it in...fluid should come out. While holding lever in,re-tighten bolt. You should get a lil bit of lever feel now. Making sure there is fluid in the resrvoir,...squeeze lever multiple times,and hold it in,....loosen the banjo bolt again,...slowly,..untill fluid rushes out. Then,..while holding lever in,retighten banjo bolt again. Check fluid,...then pump the lever multiple times again,and you should be getting some good lever feel now. After this,you may need to bleed the air out at the bleeder a couple times till alll the air is out.

Get new engine oil and ad a little bit more 2Stroke oil with petrol and make sure your water is full ?

Thank you for contacting FixYa with your inquiry. I have been going
over some of the older help requests that have been archieved and
trying to provide solutions for those that didn't get answered. Hope
this information helps.

You might have bent shifting forks or the dogs on the gears are worn. That would be a case split and Removal and Repair of bad parts.

TRY THIS FIRST:
Work on your shifting technique. When you want to shift from 1st to second apply up pressure with your toe and roll the throttle off and let it pop into gear. Don't use the clutch other than for starting or a few suituations where you need to idle while in gear. You might not be allowing the transmision to pull 2nd gear all the way in and it drops back to neutral.

Hope this helps.

Thank you for contacting FixYa with your inquiry. I have been going
over some of the older help requests that have been archieved and
trying to provide solutions for those that didn't get answered. Hope
this information helps.

Start in the middle. Check you spark plug it should be a nice cocoa brown color. If its stumbling and not running correctly then lower it 1 notch (This Raises the Needle alowing more fuel) if the plug is fouled and wet then your over fueling in the middle to high end so raise the circlip (Lowering the needle - reducing fuel) adjust accordingly using your spark plug color as the guage.

The Main Jet determines fuel mix at top speed and the needle fits into it's oriface regulating speed depending on throttle position. You may have to to up or down a size depending on you altitude.

TF