HMF Optimizer Instructions

For Models: Rancher 420 (2009-2022), Foreman (2014-2021)

Installation

1. Install the supplied resistor into the O2 sensor harness connector. (See Figure #1)

HMF Optimizer Instructions - Figure 1

2. Unplug the fuel injector connector harness from the fuel injector. (See Figure #2)

HMF Optimizer Instructions - Figure 2

3. Plug the male Optimizer connector into the fuel injector, and the female Optimizer connector into the vehicle injector harness connector. (See Figure #3)

HMF Optimizer Instructions - Figure 3

4. Run the black ground wire from the Optimizer to a good chassis ground or the negative battery post.(See Figure #4)

HMF Optimizer Instructions - Figure 4

5. Use the supplied zip ties to attach the Optimizer wiring harness away from any hot or moving parts.

6. Use the supplied Velcro to attach the Optimizer to the vehicle. We mounted ours under the seat on top of the air box lid.

Discussion

Tuning

Typically, fuel tuning is not required when installing an HMF Exhaust on this machine. However, other modifications to the machine may require the need for fuel tuning to ensure the machine runs properly, and there is no damage to the exhaust system. See the tuning settings below for possible tuning solutions or Contact Us for more information.

Figure #1

Figure #2

Figure #3

Figure #4