20 Most Recent 2009 KTM 250 SX Questions & Answers


Take the engine apart and you will find out.
Quite possibly will need new piston kit and a thorough cleaning and you'll be fine.
If you're unlucky, main bearings, and cylinder coating repair.

KTM 250 SX... | Answered on Jun 27, 2014


Mervin, I'm not a motorcycle mechanic, but just knowing engines as I do, I would say drain the fuel tank and replace with new fuel and either a water remover additive or a more complete fuel treatment (Lucas makes some great products for that); pull the plug(s) and check them for any corrosion or buildup, replace if necessary; change the oil and filter; check the air cleaner; and check tensioning on any belts. I'd also suggest either replacing the battery straight away or just putting it on a charger for a while so you know it has a full charge when you go to start it - if you need to replace it, that will eventually become evident, but you should at least be able to get the engine started and see what else -if anything- needs doing.

KTM 250 SX... | Answered on Dec 03, 2013


The starter pinion attached to the kick pedal has an ratchet pin that engages in the engine shaft - the role of the pin is to allow the engine to turn freely once started. This pin is pressed on the shaft with a simple spring that in your case either broke or went out of position.
You will need to open that side of the transmission, access the starter mechanism and refit or replace the pin and its spring - it's a delicate job, work very carefully or you can do a lot of damage if you try to start the engine with the parts misplaced.

KTM 250 SX... | Answered on Sep 25, 2011


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

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KTM Motorcycles | Answered on Mar 14, 2020

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