20 Most Recent 2006 KTM 125 SX Questions & Answers


Yes, what engine are u looking to put in

2006 KTM 125 SX | Answered on Jun 21, 2014


It sounds like he is running out of fuel in the bowl,poss accelarator pump ?

2006 KTM 125 SX | Answered on Jan 16, 2014


Hi adam, you should check out your clutch rings in your gearbox they might be wearing out and struggling to accelerate the bike

2006 KTM 125 SX | Answered on Sep 05, 2013


This is a easy fix. All you have to do is let the bike warm up a few minutes before you take off. I would like you to try it your way first. Then let it warm up for 5 mins then see what happens, you can warm it up faster by reving the engine but let it run for 1 min before you rev it up. Enjoy your riding.

2006 KTM 125 SX | Answered on Mar 28, 2012


Standard bore is 54mm. It is a Nikasil(coated) cylinder that cannot be overbored to correct for wear.

2006 KTM 125 SX | Answered on Jun 10, 2011


did you recently overheat the engine? it may be locked up. put the bike on a milk crate so the back wheel is off the ground. put the tranny in 3rd gear, and spin the back wheel. if the wheel wont turn, you burned up your motor, (seized your piston to the cylinder by overheating or running out of oil) or fried your transmission. if it turns the motor, you probably broke a tooth on the kicker gear anddthe broken piece is stuck in the gear..

2006 KTM 125 SX | Answered on Dec 22, 2010


try changing the oil,
had the same prob seem to work, dont know why,
may be due to water.

2006 KTM 125 SX | Answered on Oct 03, 2010


should say 0.9l on the side of the engine case.

2006 KTM 125 SX | Answered on Sep 11, 2010


Most likely you have bad main bearings and/or lower rod bearings. In the process, this usually takes out the piston and cylinder, too. Repair will require a total rebuild.

2006 KTM 125 SX | Answered on Jun 12, 2010


dealer parts only. if you go with a aftermarket or something from the hardware store you might have issue's. your better off getting them from the dealer. but you can if you like to use bolts from a hard ware store. just make sure they are 8.8 hardened bolts. good luck

2006 KTM 125 SX | Answered on Mar 26, 2010


blockage in fuel line, clogged main jet, incorrect fuel bowl level, dirt in bowl vent hoses, do it all the time or after runnning awhile,

2006 KTM 125 SX | Answered on Mar 14, 2010


either blown rings or main crank seals have gone are you sure its petrol / water to check for ring you need a compression tester and the simply screw in the place of the spark plug and you kick the bike over and get back to me what psi it reaches on the guage this pic will demonstrate bud 17e93a4.jpg

2006 KTM 125 SX | Answered on Oct 04, 2009


Look into your power valve. If it doesn't operate freely, you won't get peak performance. They can get gummed up.

2006 KTM 125 SX | Answered on Jul 27, 2009


Open the case and check to see if the gears are stripped and to see if they are assembled right.

2006 KTM 125 SX | Answered on Jun 06, 2009


?????? Why did you even bother posting?

2006 KTM 125 SX | Answered on Apr 30, 2009


yeh its like stacking your dishes lol

2006 KTM 125 SX | Answered on Jan 15, 2009

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