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Head surface cleanup 01 WR

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What is the best way to clean the head mating surfaces? On my Waverunners I have always used fresh razor blades.... need suggestions.

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How do you keep crud from falling down into the bore?  Tape it off?  I will probably just use scotch-brite and do it by hand.  Where do you buy scotch-brite? (honest question)

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This is what I use:

https://www.harborfreight.com/2-in-3-in-fiber-disc-sanding-kit-61561.html

Chuck it into drill or 1/4" die grinder and go to town.  Scotchbrite pad will work by hand but you'll be there a while with it.  Grinder or drill works A LOT faster, couple of minutes vs hours, and does not damage parts; its soft.  You don't have to worry about taping it off.  Just run the piston to TDC and hold it there.  Head you should have in your hands.

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