Mike, What you do is order the pressure nipple for the fuel injected 1.60 from Tower. It replaces the top left back plate bolt. Look closely at your engine and you will see a boss cast into the case right in front of the end if the back plate bolt (top left with cylinder up). Carefully drill the bottom of the bolt hole into the case, holding the engine vertically so the shavings fall out. Put the fitting in and you're done. A hand micro drill or 1/16" at most will do.