Don't do it! I've had cone air filters on other motorcycles - most recently a Yamaha XS1100 Special. And, surprise, when riding in moderately heavy rainfall it almost drowns out due to ingesting water into the carbs. I now have over 40k miles on my stock 2002 VN750. And it will run in a deluge. Maybe it's an ok cheap way out if you are reviving a salvage or mistreated machine that is missing parts. But beware modifying the work of design engineers. And I haven't even mentioned the carb rejetting hassles.