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my 521 rotax looks like that...hehehehe.... 0.20" off the head should make up for the aluminum thats missing haha...

On a more serious note, I would replace it. It would probably run just fine...but probably not as well with one without all the chunks taken out of it..I dont know...Does that create more squash for compression? I've wondered this becase my 521 looks the same on both cylinders..
 
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