Question about 2007 KTM SX 105

1 Answer

KTM 105 SX spark plug fails every ride???

Hello guys I have a 2007 KTM 105 SX that I just bought. Its a 2 stroke, of course, and I took it out to the desert 3 times so far. The 2nd time I went riding, the bike just died after about an hour and didn't want to start again. I changed the spark plug, pulled out a screwdriver and played with the carb a lilbit. It fired up and ran fine after that, but it was the end of the day so didn't really get a chance to ride it anymore that day. Last weekend we went out to the desert again. The bike ran strong for about an hour and 1/2, and then the same thing happened again - it just died in the middle of nowhere! I tried to adjust the carb again but it didn't help. Changed the spark plug - and it fired up and ran strong again. I feel like there is something with the carb maybe, but I don't get what's the deal with a new spark plug every 1 hour of riding!!! Anybody??

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

  • KTM Master
  • 40,630 Answers

Hi, Sagi nice novella and the usual suspects are:
1. Fuel mixture too rich or enrichner left out too long.
2. Faulty spark plug.
3. Incorrect spark plug for the engine type or service.
4. Piston rings badly worn or broken.
5. Valve guides are badly worn and/or seals worn, crushed or have come off the valve guide and are pumping oil through it.
6. Spark plug cable weak or leaking check for spark jump in the dark.
7. Faulty ignition coil.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
http://www.ktmforums.com/forums/two-strokes/1966-solution-fouling-spark-plugs.html
Why Does My Dirt Bike Keep Fouling Spark Plugs
KTM 85sx 105sx service manual repair 2004 2009 85 sx 105 sx Download... $8 cheap
http://www.partsfish.com/page/oem-parts-for-ktm
KTM 85 105 SX Owner Manual

Posted on Mar 11, 2017

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

pakis
  • 86 Answers

SOURCE: 2005 ktm 450 sx die while riding.

yes, you are correct, those are the two pieces that could solve your problem, but i would go first for your cdi, you may choose to have it tested first also, before you jump out to buy a new one.

Posted on Nov 24, 2008

Benimur
  • 6966 Answers

SOURCE: new spark plugs last 10-15 minutes of riding

Hi and welcome to FixYa,

Offhand, the only factor to be checked that could foul a sparkplug for your bike would be the 2T oil injector/pump. There is too much 2T oil going to the combustion chamber. Either the injector would require restricting or for some reason, there is also 2T oil in the fuel tank (pre-mix).

Good luck and Thank you for using FixYa. Happy Holidays.

Posted on Dec 07, 2008

dmsr63
  • 2050 Answers

SOURCE: 2006 KTM 125 sx high revving out problem

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

Posted on Jul 27, 2009

  • 4088 Answers

SOURCE: jerking at a 25 to 30 mile an hour speed

Look at the slide needle--'c' clip unbroken and retainer pushed down tight. Has the 'c' clip position been changed? Try a new spark plug.

Posted on Aug 04, 2009

  • 636 Answers

SOURCE: how do i check the tranny oil level on my ktm sx 125

I would think the it is all one unit, motor oil lubricates that as well.

Posted on Sep 05, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I've got a KTM 125sx 2002 I've done a top end rebuild piston etc and put a new coil and plug on it and the bike won't start with the kicker, only with a bump start took the plug out and its got a weak


Hi, Ian and the usual suspects are:
1. Fouled spark plugs.
2. Discharged battery, check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Loose connection at ignition coil or plug between ignition sensor and module.
4. Spark plug cables in bad condition, shorting / leaking, spark plug cable connections loose.
5. Faulty ignition coil or ignition / electronic module
6. Failed CKP, CMP, or BAS sensor.
7. Faulty ignition switch.
8. Security alarm failing to disarm needs reset
For more information about your issue and valuable free downloads that you will need please visit the websites below. Good luck and have a nice day.
125sx won kick start please help me KTM 2 Stroke
ktm 85 sx no spark
1999 2003 KTM 125 200 SX MXC EXC Service Manual Moto Data Project

Feb 23, 2016 | KTM Motorcycles

1 Answer

I have a ktm 250 sx 2-stroke. It has a new piston and new cylinder. bike ran great before it needed the repairs. Cranks on first kick. Run good but it leaks the pre-mix everytime i ride it and it won'


Where is it leaking from? If its leaking, that's more than likely why it doesn't run right, the fuel/air mixture is off. Also, I wouldn't continue to run it until the leak is fixed as it may damage the motor from not lubricating properly.

Aug 14, 2013 | Motorcycles

1 Answer

I have a 2008 KTM 105 SX and I don't know how much


Use 50:1 ratio or 2% oil in the mixture.
That means 20ml oil for every 1000ml (1lit) of gas.

Oct 22, 2012 | Motorcycles

1 Answer

What is the difference between the ktm 250 sx and the sx-f???


The KTM SX is a 2 stroke,the SX-F is 4 stroke.

Feb 21, 2011 | 2008 KTM 250 SX

1 Answer

My 2006 ktm 250 sx-f smokes blue when i pull away


Is this a 4 or 2-stroke?
4-stroke = bad valve seals of piston rings
2-stroke = oil/gas ratio too 'oily' OR air filter clogged.

Dec 14, 2009 | 2006 KTM 250 SX-F

2 Answers

I want to get back into motocross and have been told that the 2006 KTM sx 250 is the bike to buy. Is this true


My honest opinion? (40 years of riding, three years of motocross, and 15 years of hare scrambles)
All bikes are good, KTM...Honda...Kawasaki...Yamaha...Suzuki
It really up to maintenance, rider ability, and of course a newer the bike doesn't hurt either.
Go with what you can get parts for, and you'll be able to work with.

Sep 11, 2009 | 2006 KTM 250 SX

1 Answer

It wont start


well it could be because the bike sat for a while. with the 2 stroke gas being mixed with oil sometimes when it sits the oil sinks to the bottom and it will clog the valves fuel lines carb every thing. you should check.

Mar 28, 2009 | 2006 KTM 525 SX

2 Answers

Tyre pressures and oil grade.


gearbox oil-20w/40 0.73 qts. cooling system-1.26 qts. 50/50 mix 2-stroke oil-shell racing x/40 fuel grade-98 spark plug-ngk r 6918-b8 spark plug gap--.024" main jet-190 idle jet-48 needle position-3 pilot screw # of turns out-1.5 rear tire pressure-14 lbs front tire pressure-14 lbs keep air filter element well cleaned & oiled w/ air filter oil.there are service manuals available for this model.

Feb 18, 2009 | 2003 KTM SX 125

1 Answer

LOSE OF SPARK


Pull the plug back out of the cylinder and ground it against one of the head bolts, kick the engine over to see if you are getting a spark.

Nov 12, 2008 | 2008 KTM 105 XC

Not finding what you are looking for?
2007 KTM SX 105 Logo

Related Topics:

136 people viewed this question

Ask a Question

Usually answered in minutes!

Top KTM Experts

yadayada
yadayada

Level 3 Expert

75797 Answers

Arnie Burke
Arnie Burke

Level 3 Expert

4514 Answers

Brian Anderson

Level 3 Expert

356 Answers

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

Answer questions

Manuals & User Guides

Loading...