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Just a number of things I have noted with my experience; the Hiflow Filtro HF138 is an aftermarket cartridge filter that I used on my bikes when road racing as well as the Suzuki and the better half's RSV4 (that motor is a nuclear reactor). I'm not wanting to freak anyone out about K&N but I had been told by valid sources that there was an apparent quality control issue at some time with them. That was a few years ago. If not for Hiflow, would I go with a factory filter? Absolutely.
As for tightening, the manual recommends against hand tightening and describes tightening it a certain amount of rotations after the gasket contacts the case. Why do they recommend against it? Speculation tells me that they're afraid that it might spin off which has happened to aquaintances on the street. I have something I do for that. I place a hose clamp around the filter, run safety wire through the worm gear assembly and attach the wire to a bracket that is in the area over the filter and behind the pipes. I place the worm gear in a position in which if the filter decides to try to come loose, the wire prevents it from spinning. I'm sure there's even a torque setting out there somewhere but there isn't enough room to get my torque wrench in between the filter and pipes anyway.
As for tightening, the manual recommends against hand tightening and describes tightening it a certain amount of rotations after the gasket contacts the case. Why do they recommend against it? Speculation tells me that they're afraid that it might spin off which has happened to aquaintances on the street. I have something I do for that. I place a hose clamp around the filter, run safety wire through the worm gear assembly and attach the wire to a bracket that is in the area over the filter and behind the pipes. I place the worm gear in a position in which if the filter decides to try to come loose, the wire prevents it from spinning. I'm sure there's even a torque setting out there somewhere but there isn't enough room to get my torque wrench in between the filter and pipes anyway.