87 550 motor ? - PWC Forum: The best hang-out for Personal WaterCraft enthusiasts
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Old 09-19-2011, 05:56 PM   #1 (permalink)
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Default 87 550 motor ?

Hello I am wondering what is the most I can bore my 550 over and still have good realiability? Have to replace the pistons anyway so just curious? Thank you for your help
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Old 10-08-2011, 07:44 AM   #2 (permalink)
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the most you can bore a JS550 is 76mm. There isn't a sleeve in the cylinder so after that is bored you have to find another stock cylinder.
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