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So as the title says, I'm trying to replace my honda gx390 on my beavertail with a predator 420cc engine. I have the mounting bolts off, but ran into a problem. The crankshaft seems to be seized to the ujoint for the driveshaft. I've tried using a pry bar and also tried to use a 4 or 5 foot piece of pipe and hitting it with a 3 lb hammer to try and break it free with no luck. I've also had it soaking in pb blaster. Is there a certain way to get these parts separated or how would I do this?
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Make sure there isn't a double set screw in the hole you took one out of. They sometimes do that to prevent shaft slippage. Then I would try applying heat to the coupling while tapping it off.
 
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