Very good valve - I've seen it not recommended for cars over 300cc. no issues or problems so i bought it for my KZ550 as the stock vacuum tap leaked at times and used that as insurance (better safe than sorry and such). The problem is that the main valve body is steel not brass and the walls of the serrated joints are quite thick so even with a 5/16 (8mm) fuel line there is still a limitation as the inside diameter is reduced. a lot of. I haven't had any fuel issues yet, but I haven't ridden the bike much either. The valve works very smoothly.
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