Maintenance & Technical > KX500 Original

Seized

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hughes:

--- Quote from: gowen ---Thanks Cam!!! I have installed a PVL system, which is the entire ignition. Coil, CDI, stator, flywheel, ect.  So, I'm stumped on where to look. I have crisped the Jetting, but failed to rethink that the PVL system allows the system to rev about 20% over stock where it shifts the power, and never richened the top-end. Even though it ran great, maybe the semi-lean mixture (for running 20% over stock) and mixed with the engine not warm has caused a nasty seize? I'm out of options it looks like, let me know what you guys think, I'm going to send the cylinder off to the guys that built it and let them see what they say. Anyhow, thanks guys, please keep the oppinions coming, cause I will start to tear into the lower-end now, and need suggestions to just change everything or what.
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Gowen, That makes sence if you are on 20% more over rev the engine will need more fuel. You have no carbon on the piston dome not even a little. This could be cause of a air leak leaning out the engine or a lean jetting. The lean jetting could be border line and has taken some time to fail the piston. I'm puitting my top end back together next week and what happen to you is my worst fear. Good luck.

gowen:

--- Quote from: hughes --- Gowen, That makes sence if you are on 20% more over rev the engine will need more fuel. You have no carbon on the piston dome not even a little. This could be cause of a air leak leaning out the engine or a lean jetting. The lean jetting could be border line and has taken some time to fail the piston. I'm puitting my top end back together next week and what happen to you is my worst fear. Good luck.
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Shiite. I'm now realizing what I more than likely did.. I use a 55 gallon barrell of C12 for the big 5, and use the little 5 gallon barrels they provide to store my "premix" in, which I use MC1@50:1. I realize that I went and filled my empty gas tank before getting to the park, which means it was not shaken up, which also means it was sitting for a few weeks.. which also means.... dammit. Anyhow, I sent it off to Eric Gorr. At most, it has to be replated which isn't so bad, I already purchased a few piston kits when I had the engine done.

Now, it is looking like I fried the crank bearings. When I rotate the crankshaft, I hear a metalic squeeking or scraping, which it is not coming from the rod (thank God). But soundsl ike the bearing(s), not sure.

gowen:

--- Quote from: Arigato ---You'll have to see what it looks like after you get that aluminum off.  I'm betting you're gonna have to re-plate.  You should probably go through the whole motor if it has 100hrs on it.  Those 520's make a lot of power and are hard on everything.  Mine twisted and bent the crank.
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Double s**t man, my rod bearing is busted. The metalic noise is the lower end bearing. That sucks majorly.

gowen:
Well, it looks like the rod bearing might be ok. I filled the crank with 2t oil and rotated it a few times, and the noise went away, there is NO up/down play at all, it has some side to side play, but that is it. I think this is ok, guys let me know if I'm off my nut.

The cylinder is out and hopefully will be fixed soon. It took me awhile to send it, cause I had to get permission from the higher power (my love :-) ) to send the extra $$$ on this bike, since I don't ride it often anymore.

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