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Try a good air impact wrench. Be patient, many times they are installed with locktite.
 

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Assuming you're referring primary since you mentioned the crank it is a tapered fit, definitely not threaded on but most likely the keyway is rusted to the crankshaft. Can you get some heat to the shaft? Careful, lots of expensive aluminum around you don't want to damage. Do you have the proper puller?

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I think.... therefore I sled
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Two '94 Indy XLT SKS
 

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You know, I really ought to read the post and not just the topic [LOL] Sorry about that skrplyr. If you have puller and heat, then you might want to try and give the puller a smack with a 2-3 lb sledge. Softly though as you know about crank bearings. then get back on that puller. They are just tapered fit so it's rusted on there good. When it goes back together don't forget the never seize.

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I think.... therefore I sled
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Two '94 Indy XLT SKS
 

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Yea like bman said, use the puller till it doesn't seem like its not doin anything, then hit the end puller with a hammer then go back to the puller, then repeat the prosess until she comes off.

Ride Polaris!
 

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If you are going to be hitting your puller or whatever with a hammer, be damn careful you don't wreck your crank bearings.



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