KTM 640 - engine randomly dies

Congrats.

Not too shabby for a 14 year-old motorcycle..




Obligatory parade lap around the 'hood

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Spades,
Congrads, very impressive.
I give you all the credit.
The engine sounds great.
bill

Dolphin13, it seems to run about the same as before. Mine's still corked up since I ride through a bunch of residential areas to//from work. My front light is smidge brighter, but after checking out the squadron I realize how wimpy it is (55w bulb).

I recognize the hyperlights, but which LED 1157 bulb did you use?

http://www.youtube.com/watch?v=vNZRj1r9IpY

http://www.ledlight.com/36_led_ultra_bright_low_profile_s25.aspx

Thanks...

Hoping you're still subscribed to this. So what eventually was found to be the culprit? Did you try the old CDI once you'd gotten it to run 100% of the time? Was it the coil? You're leaving me hanging here. :)

It was the CDI

Glad you got this going Spades. Do you know if it was the pulse/ ignition coil, plug/plug cap or both?

BK

Interesting thread.

So You are 100% sure it was the CDI all along?

I have a similiar "buzzing" problem- only difference was that apart from the annoing "bzzz"- everything seemed to work fine.

described here:
https://advrider.com/f/threads/ktm-660-rallye-questions-thread.915778/page-4

This kept me really uncomortable with the bike- as the "buzzing" just didn't sound right althrough everything withthe bike run fine. Checking with a couple fellows that run the bikes with kokusan CDI- some of them told: "mine was buzzing since I got it- but also ran fine I even contacted the guy that repairs them- just to hear that "buzzing" is quite normal and there shouldn't be much to worry about

Since the original CDI is discontinued- it's not that easy to just get the new black box ordered- and still- if the bike is running- is it worh spending a lot of $ just to get rid of the buzz (read: is buzzing sound always the symptom of the unit going bad ? or am I just fooling myself )

The buzzing doesn't sound good to me, however one of my two LC4s do it and both runs very well. At least I can't hear it when the engine is running.

Strange indeed...

...what You say somehow confirms what the engine electronics gurus I asked about this have to say- that buzzing is the sound of Voltage Inverter in the CDI that boosts the voltage from 12 to fev hundered Volts for the CDI output to the Coil- that it somentimes gets loose from the insulation and may "resonate accusticaly" upon work. Still I would preffer the unit that doesn't "buzz"