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I am looking for late 80's early 90's polaris indy 500 or 600 or 650 big bore kits or parts or engines. If anyone has any info or leads to some it would be greatly appreciated.

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You might want to send the_hog a PM for some 650 bigbore stuff.
 

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I've never heard of a 500 fuji twin Big Bored kit, as they never made a 600 fuji twin motor...... the only Big Boring you can do is porting, bore cylinder bigger, bigger pistons, weld and blueprint crank for closer tolerances, carb boring, re-clutching/re-gearing, jetting, y-pipe/pipe/can combo, or twin pipes.
 
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