In Reply to: injection pump posted by kelly on August 17, 2002 at 08:58:12:

We got a set of those torx bits at NAPA. If I remember right, the 2188 pump is about maxed out from the factory. The 2388's have a bigger pump and can be turned up way past what they should be running for H.P. The governor can be perked up a bit with a long 4mm allen wrench but you have to know what you are looking for in the bottom of the pump and you have to know what you are doing after you find it. If you turn up the pump make sure you have an experienced operator in the seat or you will be replacing rotor belts and PTO's.