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I am looking for an adjustable fuel pressure regulator to put on a 1997 Arctic Cat ZR 580 EFI. Has anyone done this?
 

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Yes several times.
Both of my 580's have them.
I have found that as the Cat EFI ages it seems to put out more pressure resulting in flooding.
I made an adjustable to be able to fine tune the efi for pipes, big bores, porting and other mods!
 
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