Maintenance & Technical > KX450F / KX250F
Can't get it started
fredunderwood:
Took the plug out, sparks, press kill button in and it doesn't.
sandblaster:
Assuming that your bike is mechanically sound and correctly jetted here is what I do.
Turn on the pet cock valve.
Lean the bike over until a little fuel drips out the over flow.
Straighten the bike up.
Turn on the choke.
Slowly rotate the engine until it is just past TDC.
Quickly jump up and kick a full swing on the kicker with all my weight.
Usually takes 2-3 tries before it will fire.
Anything less then my best effort kicking it over and it won't start.
Foxx4Beaver:
you had said in a previous thread right before X-mas that you had it running/idling, but as soon as you gave it throttle, it would die out, and then it would just kick back when you tried to start it again after that.
http://www.kxriders.com/forums/index.php/topic,12317.0.html
That "could" be a sheared flywheel key causing the kickbacks.
I just went through the same thing after installing a bigger brand new carb....I had to fatten up the pilot to get it to go above idle...once that was done it ran great, but fell flat on it's face in the upper revs....so I had to fatten up the main...now it has power all throughout....but, I still have a lot of fine tuning to do, and the weather is not ideal here for testing...15 degrees for high temps and we're expecting a ft of snow tomorrow and Friday, so I don't know when I'll get back to it.
I should also point out that mine was a COMPLETE rebuild....I'm actually embarrassed to say how much I spent this time.....and mine was a bitch to get started the 1st time, most likely from all the oil that was in the cylinder from assembly....it took 10-12 hard kicks.
fredunderwood:
I'm gonna pull the flywheel today....but, I have read in a climber manual, if spark is "weak" versus a fat blue spark, that could be the problem....so subjectively, yes there is spark, but fat and blue???? Uh we'll? I'm also going to check for connections versus the wiring diagram to see what I can find, but I have no answer to tell if my spark is weak versus fat????
Foxx4Beaver:
Take a browse through this thread when you get time....very helpful, useful info.
A lot of it you may already be aware of, but still good reading.
http://www.kxriders.com/forums/index.php/topic,10928.0.html
Keep us informed.
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