Question about 2001 KTM SX 125

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Need compression range for 2001 KTM 125

Need compression range. Put compression gauge on bike getting 145psi.

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  • vtrktrmn May 11, 2010

    Over 120 psi is good. What is the rest of your problem?



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

Posted on Sep 08, 2009


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Hi please reply soon my ktm sx 125 2001 left side crankcase has split 10 centimeters down the middle just behind the sproket, it cant get welded because the sprocket will be pulling at the weld so hard it...

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?

Aug 17, 2011 | 2001 KTM SX 125

1 Answer

Where can i buy a left side crankcase for a ktm 125 sx 2001 mine is to cracked to be welded it needs replaced but i cant find one anywhere please help

Thank you for contacting FixYa with your inquiry.
The following link will take you to a good source for your parts requirement:
#1 52330000044 Superceeded Engine Case Cpl.w.tran.bear Look for Part Numbers 31007107001 50330000050.50330022000.503330 Another source:
Or Motorcycle superstore:
Sometimes these people will be parting out a 125 SX:
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,

Aug 13, 2011 | 2001 KTM SX 125

1 Answer

Power issues

if compression is below minimum you should put in a set of rings but i would first check to be sure the valves were adjusted correctly as this may cause loss of compression

Jan 20, 2010 | 2002 Yamaha TT-R 250

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Hey ppl ive bought this bike a ktm 125 sx 2002 from a guy .he sold it me prety cheap as it`s had pre mixed oil mx5 syth.put in the gear /transmition/part of the bike . the bike is spiting oil out of the...

In other words, you want to flush the theold out?
Drain the old, fill to proper level with20 weight oil and run it for five minutes then drain. Watch your oil pressure. Anything of the old still in there won't hurt a thing and will get dumped on next change. Oil cming out the exhsust is a two cycle thing and will exist if the mix is to much on the oil side.

Nov 11, 2009 | 2002 KTM SX 125

2 Answers


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

Apr 30, 2009 | 2001 KTM SX 125

1 Answer

No power band

fuel starvation problem possibly in the fuel line or filter and cap breather as well.not ignition likely

Dec 08, 2008 | 2001 KTM EXC 125

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Compression test

minimum 125 psi (time for a top end then) ... proper pressure after 5 kicks should be in the 175-190 psi range on fresh top end for that bike.make sure to either push the kill button or ground the plug to the engine while kicking it over or you could damage your CDI unit.,

Nov 10, 2008 | 2003 KTM MXC 300

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and i have 106 psi and the servicebook says it should be around 140-190.. thx for quick answers!If your checking the compression right I suggest pulling your top end , checck your rings maybe replace them, also put a micrometer to your cylinder refer to your service manual for the specs. If all that checks out order a high compression top end gasket kit,I use a kit made by Moose Racing, you don't neeed to modify your engine with this kit. Iput one one my 2000 KX250 2stroker, and could notice a better pull in the engine.,,,

Nov 10, 2008 | 2004 KTM EXC 125

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