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KX5 died.... any input for the authopsy??

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Sagid:
Well I just got my self a KX5 last week, it is a 90 model that was sitting in some barn for a century, or so I was told. it actually does look really good for a 90 model.

So there I was as proud as I could be with my new monster toy.. I have been riding a vintage ?83 CR480 for the las 5 years or so... got tired of digging for parts.

Well the thing is that I went out to test the KX5... It felt really powerfull on the first trials... I noticed some not stable running at low RPM?s  and it was going off when idle.... didn?t really bother me ?couse it is ment to be hard ridden anyways.
So the next morning I took off the carb for cleanning, thinking the problem was due to lack of use and dust accumulation.
So I did my thing... not really a tune up.. it was pretty much removing dust on the outside with gasoline and a brush... I opened the carb and did the same thing on the inside.. made sure not to move the jet needle or the floaters valve.. put it all together again... installed a new air filter... I did turn the idle control screw about one third of a turn... So when evereything was in place I started kicking... on the third kick the bike starts and it when on full throttle like it was posessed!!!! I pushed the kill switch a hudred times and it didn?t worked... it only stopped untill it burned out the gas left in the carb. after that the compresion was... well.. was not there anymore... I openned the cylinder and found a blown piston ring. Not so big deal to fix.. but I?m more concern about knowing what the hell went wrong??? Thinking that this could happens when I?m riding the bike gives me the creep.

Any Ideas out there?? it?s a shame this is my first posting.

Kawasakinut:
read my thread ( runaway two stroke ) as far as i know it could be a couple issues. they call it a runaway 2 stroke because even though you pull the plug this machine keeps on running or you push the stop start switch and nothing happens. could be the throttle cable but i doubt that because you hit the stop switch and it kept running. most probable is an air leak (carb boot) where air is entering the engine and you would not be able to regulate it. anyway check my post above for more and welcome to the site.     

KXcam22:
Sagid,
  I wouldn't worry, that is unusual.  It is possible your carb slide was stuck after the rebild but it sounds more like a lean runaway.  On those the kill button doesn't work since the extra-lean mixture is self igniting and stopping the ignition doesn't do anything. Have to put it in gear with the rear brake on.  For a start I would pull apart the carb and verify everything and set the jetting exactly like the jetting chart (search the site). That should get you close.  The KX500 runs very good and idles nice when it is jetted right.  Hope this helps. Cam.

hughes:
Also make sure your fuel petcock is working correctly. Remove fuel line from carb place container under fuel line and turn on fuel cock. Should have a nice flow of fuel coming out.

Hillclimb#42:
When you look in the carb the slide should close all the way. The cable should have just a little bit of play that you can feel in the throttle tube. My guess is slide is open or cable bound holding it open. I think it would do the same thing if the base gasket blew, but you could probably see that.
 Everyone is right and thats a good lesson that I learned. Brakes and hit second gear=saves motor. Don't start a bike on a stand either.
 That sucks man, you were supposed to post about the sweet k5 that you picked up in mint condition....and tell us about ripping off the nobbs doing 4th gear wheelies. Repost after fixing piston

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