Here is a list of the 4 cycle parts info and threads related to these items:
- Yamaha 4 Cycle (230 series boats) MR-1 Filter (page 7-KN-303) and Spark Plugs (CR9EB), an alternative filter alternative
- Yamaha 4 Cycle (210 Series boats) Spark plug and filter thread
- Yamaha 4 Cycle (240 series boats) Filter (K&N HP-1002) and Spark Plugs (#6668 LFR6A)