Amazon has a decent waterproof cover for $15 | Honda CBR 300 Forum
Amazon.com: Lorababer Motorcycle Tail Part Rear Solo Seat Cowl Cover Passenger Pillion Fairing Cowl for Honda CBR300R CBR300F CBR 300 R CBR 300 F 2014-2017 2015 2016 14 15 16 17 (Blue) : Automotive
Amazon.com: KAJIMOTOR Slip on Exhaust Motorcycle Muffler Silencer Tail Link Exhaust Midpipe System with Removable DB Killer for Honda CBR300R CB300F CBR300 CB300R CBR 300 2008-2018 : Automotive
Amazon.com: Coffman's Shorty Exhaust Slip On Muffler for Honda CB300F CBR300R CBR 300 (2015-2022) Sportbike with Red Tip : Automotive
Amazon.com: Motorcycle Accessories Rear Passenger Pillion Solo Seat Cowl Hard ABS Motor Fairing Tail Cover for H.onda CBR300R CBR 300 F 2014 2015 2016 2017 Parts (Red) : Automotive
AUTOKAY Voltage Regulator Rectifier For Honda 300 TRX300 TRX300FW Fourtrax 4x4 93-00
Amazon.com: KAJIMOTOR Slip on Exhaust Motorcycle Muffler Silencer Tail Link Exhaust Midpipe System with Removable DB Killer for Honda CBR300R CB300F CBR300 CB300R CBR 300 2008-2018 : Automotive
Amazon.com: DNA High Performance Air Filter Compatible for Honda CBR 300 (15-22) PN: P-H2S11-01 : Automotive