Please share more about your other mods to increase power, sounds interesting!
Start with "Chapter_04_Fuel_System.pdf":
Quote:
Originally Posted by Polaris
NEVER remove or attempt to remove the tamper proof devices from the full-load fuel adjusting screw or the high-speed throttle limit screw on the fuel injection pump and governor assembly. These adjustments have been made at the factory to meet all applicable emissions regulations and then sealed.
• NEVER attempt to make any adjustments to these sealed adjustment screws. If adjustments are required, they can be made only by a qualified fuel injection shop that will ensure the injection pump continues to meet all applicable emissions
regulations, and then replace the tamper-proof seals.
Once you've decided to ignore these warnings, you can adjust the Yanmar fuel injection Pump and injectors, just need somebody with experience on this facet of Yanmar diesel engines.