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What Caused my bent Arm (assuming Hydro Lock), and How to Avoid?

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randomguy

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So I've got another post out there asking for advise about which path to take moving forward with my engine (here), but I also obviously want to learn from this experience and avoid it again.

I rode this 94 SXP right up on to the trailer last fall. I had looked up a few sites with instructions on winterizing and did some basic stuff. Ran it a little and revved it on the trailer to try to get as much water out as I could, got some fogging oil and shot it in the plug holes, grounded the plugs and turned over a few times to work it in. Also topped off both fuel and oil tanks, added fuel stabilizer and cleaned out.

I then took the battery out, covered it and tarped it, and took it to my family's farm and stored it in the barn for the winter.

Brought it back a few weeks ago, took the plugs out and looked things over, tried to start and never really got it running. So I started tearing things out and once I pulled the jugs, I find a bent con rod.

So my assumption is hydro lock, but what fluid was above the rings? Unignited fuel, water, oil? Clearly, the "several hundred" dollar question is how did I manage to do this to myself and how to avoid moving forward? Please (continue to) educate me. I've learned a ton from this tear down and from this forum, but I guess this is the most important question.
 
Did you get any antifreeze in the block? If water was in the block and froze it could have expanded enough to bend the rod, only thing is I would think it would have cracked the cylinder first. Are the cylinders O.K.?

Lou
 
No, I didn't run any antifreeze in the block.

Once out, I gave the jugs a quick look over and didn't notice any cracks, but I probably need to look them over better with serious light.
 
So I was thinking, how does a guy normally flush with antifreeze? As in, what do you use for the propulsion to run it through?
 
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