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Old February 1st, 2015, 11:43 PM   #1
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Low oil--->Killed engine--->What happened?

Previous owner took a 2006 kawasaki ninja ex250 on a long road trip and it died along the way. Just stopped working. One cup of oil was left I when they drained it.

I'm not too familiar with motorcycles but I managed to take apart some of the engine and I have a couple ideas what happened. This screw looks like it popped out and got wedged beneath the piston. I can't get anything to spin. I really want to fix it. What do you think I can do?
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Old February 1st, 2015, 11:45 PM   #2
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This is what I found when i took the top end off.
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Old February 1st, 2015, 11:46 PM   #3
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Anddd this
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Old February 2nd, 2015, 12:06 AM   #4
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Old February 2nd, 2015, 12:20 AM   #5
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Chuck it in the trash can and hope the trash guy doesn't question you when it sounds like a bomb went off in the truck.

Then get a replacement engine.
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Old February 2nd, 2015, 12:50 AM   #6
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Just by another used engine. I think the 250's go for $500 or less on ebay or cycle salvage.
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Old February 2nd, 2015, 03:39 AM   #7
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Thanks for the advice. Still have a question though.
What happened to it and how do you fix it?
From the responses, it's obviously not worth to keep it but I'm still curious what happened and how people fix this problem.
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Old February 2nd, 2015, 06:27 AM   #8
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OK, at a guess:

Connecting rod bolt falls out (how that happens in the first place is anyone's guess)

Bolt starts getting kicked around the the crankshaft, doing major damage to the inside of the crankcase

At some point bolt gets wedged somewhere it doesn't belong.

Irresistible force meets immovable object. Stuff breaks (liners and piston). More shrapnel.

How do you fix it? Well, that depends on what damage got done. The block itself may be damaged beyond repair. Ditto the crank, rods, bearings... you name it.

The cylinder sleeve itself is destroyed. I don't even know if it's possible to replace that.

This engine is toast, IMHO.
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Old February 2nd, 2015, 08:46 AM   #9
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Nicely done, now that's a blown engine, and your in the market for a used engine for sure.
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Old February 2nd, 2015, 08:59 AM   #10
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WOW

that thing is smoked. yeah you'd probably end up replacing more parts in that than the parts you keep... a new engine is in order.

Still, don't throw it out, part whats left out, people on the forums are always looking for odds and ends screws, ya never know. You can probably get enough money out of selling the head, carbs and generator/flywheel to pay for a whole new engine.
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Old February 2nd, 2015, 11:00 AM   #11
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How many miles were on the engine? That is crazy. Ninja 250's are cheap as hell in working order, never mind a replacement engine. Just cut your losses and buy a used engine and throw that sucker in.
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Old February 2nd, 2015, 11:05 AM   #12
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Originally Posted by recognize View Post
Thanks for the advice. Still have a question though.
What happened to it and how do you fix it?
From the responses, it's obviously not worth to keep it but I'm still curious what happened and how people fix this problem.
you don't fix that. you salvage whatever parts are left undestroyed and start fresh.

what happened? a bolt came out and destroyed everything. what caused the bolt to come out? this is a big question that none of us will probably ever know the answer to. maybe a bad service, maybe a manufacturing flaw. who knows. it dun broke and most of the rotating assembly is probably compromised.
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Old February 2nd, 2015, 01:43 PM   #13
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I've seen and heard it happen in a couple of cars. Someone likely had been in the bottom end in the past (but why?).

Sound-wise, it starts with a metallic rapping at high RPMs. Then it gets worse and occurs at lower RPMs, too. Then, BANG. Instant lock-up.

Toast.
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Old February 2nd, 2015, 01:50 PM   #14
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if the bottom end starved for oil so did the cam and cam journals so those are likely toast as well. Do a WTB thread here, a member will surely hook you up with a good runner.
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Old February 2nd, 2015, 05:31 PM   #15
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Most likely a connecting rod bolt snapped and caused hell on the bottom end of the engine.
Something like this happens when you let the oil levels get too low and starve the engine of lubrication, something had to give and it ended up being a connecting rod bolt.
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Old February 2nd, 2015, 06:10 PM   #16
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Louis,

If you were going to fix it, that engine is basically trash,as has been said, you'll need a complete tear-down.

Check all bearings (low oil, they probably are bad), if the crank looks ok, have it checked for true then checked for hidden cracks, check the bearing journals, they probably are toast with no oil.
While it's apart, check out all the transmission gears, sliders, and bearings. You'll probably find a gear or two with teeth missing since that shrapnel went to the trans too.

Check the block for cracks, especially around where you found broken bits.

If all is ok in there. You might be able to get away with rods, rod bearings, crank bearings, pistons, rings, cylinders, new timing chain, new guides(might as well since you are in that deep). If the cams, journals, lobes, and followers all are ok, check the head for warp. If flat, reinstall.

Just the parts you know you'll have to get will probably cost as much or more than a running bike.

I could be fixed...it's just not economically sensible to attemp to do it. If the block is good everything in it can be replaced if needed. It'd just cost more than the new price of the bike to build the engine from spare parts.

Like everyone else said, find a different engine. It will be easier and less expensive in the long run.
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Old February 2nd, 2015, 06:52 PM   #17
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My guess is that it seized up from no oil, and put enough stress on the rod to pull out a bolt. When it did go, it snapped the piston up and cracked the sleeve.
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Old February 3rd, 2015, 02:50 AM   #18
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That engine is kaput - source a second hand one
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Old February 6th, 2015, 12:23 PM   #19
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Interesting how the liner got eaten but the pistons look good other than the one that is missing a big chunk of the skirt. Start fishing in the bottom end for the pieces and lay them out. I'm interested in what you find. Usually, it would look a lot worst than that, like a 12ga was pumped into each piston, especially for an engine that cruises at like 7k RPMs. How do the rods look?
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