20 Most Recent 2007 KTM 250 SX Questions & Answers

I assume you're talking about 250SXF?
Check the carbie jets are not blocked, air filter clean, exhaust not blocked and valves are in specified clearance.
At night the manifold will glow red, this is normal.
You just can't see it during the day.

2007 KTM 250 SX | Answered on Jan 10, 2013

Has major air leak (running seriously lean). If it is hard to start I would check carburation and crank seals.

2007 KTM 250 SX | Answered on Dec 14, 2012

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.

If you’ve found this helpful, please click the green “helpful” icon. If you have 20 seconds please leave a few words as a review or recommendation! Also, follow me for more answers to everyday issues, I’m all for saving you money and making the most of your time! Thanks and have a great day!

KTM Motorcycles | Answered on Mar 14, 2020

Not finding what you are looking for?
2007 KTM 250 SX Logo

9 questions posted

Ask a Question

Usually answered in minutes!

Popular Products

2006 KTM 250 SX
2006 KTM 250 SX

12 Questions

2008 KTM 250 SX
2008 KTM 250 SX

8 Questions

2005 KTM 250 SX
2005 KTM 250 SX

5 Questions

2010 KTM 250 SX
2010 KTM 250 SX

2 Questions

2009 KTM 250 SX
2009 KTM 250 SX

1 Questions

Top KTM Experts


Level 3 Expert

85239 Answers

Gino Cussen
Gino Cussen

Level 2 Expert

217 Answers

Arnie Burke
Arnie Burke

Level 3 Expert

6480 Answers

Are you a KTM Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

View Most Popular

250 SX KTM

  • 250 SX KTM

Most Popular Question

engine stops when throttle opened also

  • Motorcycles