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post #1 of 14 (permalink) Old 12-24-2010, 05:30 PM Thread Starter
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Seized 2-stroke

Hey all, I'm about to pull the motor from the RD250 frame and I took the heads off to see what was stopping the motor from turning. Well, the pistons are definitely locked to the cylinders. It looks like it could be just from rust. I'm hoping that if I can remove the pistons and jugs that the bottom end will be salvageable. Anyone have a trick for getting the jugs free? So far I've been soaking it with WD 40 and letting it sit. I'm going to try knocking them loose with some wood and a hammer, but am open for any suggestions.
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post #2 of 14 (permalink) Old 12-24-2010, 11:01 PM
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PB Blaster is the best I've found for loosening rusted stuff.

2008 XL1200R

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post #3 of 14 (permalink) Old 12-25-2010, 01:35 PM Thread Starter
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Cool, I'll have to pick some up.
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post #4 of 14 (permalink) Old 01-02-2011, 08:18 PM
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Strong Arm would be great for that. Miracle sutff, I tell ya. If you find your self in Lake Wales, I'll give you enough to do that.

Cheers,

Mike


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post #5 of 14 (permalink) Old 01-12-2011, 01:30 AM
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I would recommend soaking it with pb blaster for a day or two.
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post #6 of 14 (permalink) Old 01-12-2011, 05:15 PM
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Yep PB Blaster works wonders.


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post #7 of 14 (permalink) Old 02-02-2011, 11:50 AM
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As strange as this sounds if it is a rust seizure, pour a regular red label coke into each cylinder. There is enough phosphoric acid in the drink to loosen and eliminate rust but not enough to score the piston or cylinder. I have freed up a couple of engines using this method. You may have to let it soak a couple of days but it will free it up. Then GENTLY tap the pistons with a plastic dead blow hammer or a piece of wood. If it wasn't heat seized, this should work. I know I am way late entering this thread but this is good info for anyone facing this problem.
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post #8 of 14 (permalink) Old 02-10-2011, 11:05 PM
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try using diesel fuel it works for me
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post #9 of 14 (permalink) Old 02-11-2011, 12:45 PM
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PB BLASTER. or berryman's b12.
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post #10 of 14 (permalink) Old 02-12-2011, 08:48 PM
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I saw a chart of the amount of force it takes to loosen a rusty bolt with different types of products.
wd 40 was the worst followed by pb, liquid wrench was 3rd some expensive brand i never heard of was 2nd and atf mixed with acetone was the best
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post #11 of 14 (permalink) Old 02-12-2011, 09:00 PM
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strong arm
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post #12 of 14 (permalink) Old 02-12-2011, 09:56 PM
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I have used ATF/Acetone mix, works good.

Suz GT750K Hon CB750C Suz GZ250
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post #13 of 14 (permalink) Old 02-14-2011, 10:58 PM
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atf and wd <40 and lots of patience.
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post #14 of 14 (permalink) Old 02-14-2011, 10:59 PM
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lightly tapping the cylinders with a rubber mallet always helped me
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