Maintenance & Technical > KX500 Original
Bad coil or cdi?
95formula847:
I just did a top end on my bike and added vfroce reeds, fmf powercore and pc pipe. I just got it back from the shop to get it jetted right and it seems to run fine other than not idling very long.
But, after I ride it for awhile and shut it off, its very hard to get runnin again. It takes me a good 10-15 min kicking it to get it to fire. Once its running it seems fine. But if i get stuck anywhere with mid or anything on my boots and it shuts off... im screwed. I cant kick it like crazy as the kickstart has no grip. But even so it wont start with any good kicks I get in.
So, im wondering if there is a way to test the coil or cdi with a meter and make sure im getting good spark? Does it not starting good when warm sound like anything in particular? I have read that once a KX500 is warm it should start in one good kick. That has never been the case for me.
Also, my starting method when cold is:
-turn on gas
-lean bike and wait for fuel drip
-put in 2nd gear
-rock back and forth a few times
-kick through slowly a few times with throttle open
-throttle a third open
-tdc kick the poo out of it
This usually doesnt work unless I keep kicking for 10 min.
Starting method when warm is just to kick it with the throttle open at tdc.
Purpletj:
Start here for the starting issues.
http://www.kxriders.com/forums/index.php/topic,2169.0.html
If you have a clymer it will give you the proper specs to test the CDI and coil. Also Im very curious. Have you done a compression test? what about crank seals?
95formula847:
--- Quote from: Purpletj on April 06, 2010, 02:56:19 PM ---Start here for the starting issues.
http://www.kxriders.com/forums/index.php/topic,2169.0.html
If you have a clymer it will give you the proper specs to test the CDI and coil. Also Im very curious. Have you done a compression test? what about crank seals?
--- End quote ---
Ok, ill try and find my Clymer manual. I thought I looked though it with no luck but I may be wrong. Its got a bran new top end. I believe my last compression test was 3 rides ago and it was 140psi+ warm. It def has good compression as its not easy to kick.
The bottom end is still unchanged since the day I bought the bike. I do not lose any gear oil nor does it loose any coolant. Coult crank seals still be bad?
Goat:
I have had the same kind of issue with previous bikes I have owned. Most of the time it was the coil. If it has a crack in it it will work fine until it gets hot. As I'm sure you know metal expands when it gets hot which causes a gap and the coil doesn't work as it should. Moisture can also get in there and make it short out. I've only had one cdi go bad (No spark at all) but that bike would never start until I replaced the cdi then it was fine.
As far as crank seals go. No coolant would leak as it doesn't go through the cases at all. The gear oil doesn't run through the crankshaft channel either. That is lubed by the fuel/oil mix that the engine runs on. Page 111 in the clymer manual shows the operating principals to help understand a little better. Also page 46 for pressure testing to make sure your seals are still ok or not. Any questions feel free to ask. Hope this helps.
95formula847:
Great! Thanks a lot. Im looking through the manual right now!
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