Question about 2008 KTM RC8

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Have taken a datatool red alarm off my bike, i can see where the shop has connected it in under the fuse box , i have reconnected the cut wires but have a few open ends left right at the end that appear to be cut from a big connector block, upon starting the bike it ran for about 3 seconds then stopped. it will turn over and not fire up, need help and im hoping it will be something that ive just overlooked

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Posted on Jan 02, 2017

  • 5 Answers

SOURCE: My ktm 105 isn't getting no fire .

you need a new ignition coil

Posted on Jan 10, 2009

  • 4 Answers

SOURCE: 07 ktm 450sxf wont start

take your carb out, clean the entire thing, that means every nook in that *****. do this and if still a problem write back because in most cases were n idiot is involved, this is the most over looked problem

Posted on Feb 17, 2009

  • 112 Answers

SOURCE: 06 ktm 50 pro senior bogs after warming up

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

Posted on Apr 02, 2009

Woods Goat
  • 85 Answers

SOURCE: I bought this bike this winter, it had sat for 3

Your lower rpms are controled by the mixture screw, pilot jet, accelerator pump and the slide needle. So your problem is probably in one of these-though racing 4 strokes are known to have a little stumble at the bottom, but not what you're describing. I'll have to assume the shop has the pilot jet clean and the mixture screw adjusted properly.(roughly 1.5 turns out)

First, check your accelerator pump. Remove the carb enough to be able to look inside the throat, but leave the cables hooked up. Work the throttle a few times and make sure that there is a small squirt of fuel in the throat of the carb each time you twist the throttle. If not, your accelerator pump is clogged or damaged.

If everything is fine there, the next likely problem is the needle adjustment. It's mounted in the slide. Once you remove the needle, you'll see a small clip around it. Try moving this clip up one notch. This will lower the needle and slightly delay the fuel feed from the main. If this fuel comes in too soon, it will cause a way rich condition and cause a bog off idle.

Outside of carb issues, valve adjustment(too tight) can make for a rough idle and hard starting.

Posted on Jun 11, 2010

  • 167 Answers

SOURCE: ktm 450 sx wont start when hot.

Had this very same problem with a KX 85 last week! Turned out funnily enough to be the spark plug. So try this first mate. If that dosn't fix it then you have the age old mechanics question "did I do somthing wrong or is it just a coincidence". Start back at your beginning next & re-check your valves.Most of these late model bikes(12000-16000rpm screamers) have titanium COATED valves. Once the coating wears off they close up valves REALLY QUICKLY!!!!! If the clearances are ok your work was good & at least it will rule out insuficient valve clearance as the cause to your problem.If it still plays up - well then I would use the process of elimination to solve the problem i.e is it electrical,fuel, or mechanical. With valves checked already a compression or leakage test would pritty well rule out the mechanical system.To test electrics on motorcycles without test equiptment & a lotof know how can be difficult & EXTREMELY DANGEROUS( shock hazard 40,000 v+). So I'll try keep it simple. On the web you can purchase ignition spark testers that will connect to any plug lead & cause the ignition system to jump a gap of 6 to 8mm.These are cheap & will test the system as a whole for its performance. Great for a quick check of any ignition system. If the spark seems fine then your left with the fuel system. check for blocked fuel tap,water in tank or carby bowl,blocked fuel filler cap vent,blocked carby vent hoses,accellerator pump function.
I hope this has been somewhat helpfull.
I am happy to help with further questions
Regards Andrew

Posted on Jul 15, 2010

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