Review on NGK 3672 Spark Plug by Kai Steinbach

Perfect for 2017 Yamaha 250 V6 OffShore. Bought a new boat, choice was Merc or Yam, went Yam (no longer Merc) and apart from having to change spark plugs every year it was a great outboard. .If you have a Yamaha outboard, buy them to solve idle problems. It started for me at 50 hours and Yamaha replaced the spark plugs for free as the warranty is under warranty so I now change them once a year. Problems that could be solved with newer 250 v6 offshore models