YOSHIMURA PIM2 & DATA KIT ( 4) Installation. The PIM2 plugs into the stock wiring and isn’t much trouble to install. It routes to the airbox and mounts to a bracket behind the air filter. The Data Box requires drilling a hole and welding a supplied bung into the head pipe (or purchasing a modified header from Yoshimura). ( 5) Accessibility. Connecting to the PIM2 is as easy as removing the seat and plugging in the USB cable. However, the Data Box needs to be mounted out of the way. Unlike with the stock Honda EFI mapping tool, no battery is needed. You can unplug the PIM2 and alter the settings away from the bike or on a desktop computer if need be. The PIM2 and Data Box mount left enough room in our Honda’s airbox to change the filter without trouble. ( 6) Performance. Making changes manually at the track is an exercise in patience, and we spent most of our time setting up the Data Box. We set our target air/fuel ratio to 12. 8 and fine-tuned the first Data Box setting with two additional runs. Every MXA test rider noted a smoother, crisper power delivery that ran better from the midrange on up.
WHAT’S THE SQUAWK? There were three trouble- some features: (1) The soft- ware isn’t as intuitive as other programs and we got confused during the first few changes. ( 2) Ignition timing can’t be adjusted with this equipment. ( 3) The titanium O2 bung costs $45.00 extra.
WHAT IS IT? The Yoshimura PIM2 (Peripheral Interface Module) is a fuel-injection fuel map adjustment tool (with its own PC software). The Yoshimura Data Box allows you to target a specific air/fuel ratio and gives you map- ping changes to reach it.
WHAT’S IT COST? $429.00 (Data Box); $339.95 (PIM- 2).
CONTACT? www.yoshimura-rd.com or (800) 634-9166.
WHAT STANDS OUT? Here’s a list of things that stand out with Yoshimura’s PIM2 and Data Box fuel mapping equipment. (1) PIM2. The PIM2 allows fuel mapping changes as small as one percent at given rpm and throttle positions. The intervals at which you can make changes are every 500 rpm up to redline, and at five percent, ten percent and every following ten-percent interval up to wide open. With the PIM2 alone, you can manually adjust specific areas you want richer or leaner. ( 2) Data Box. The Data Box uses an oxygen sensor in the head pipe to compute the necessary fuel changes needed to reach your selected air/fuel ratio (based on the average of the data collected during a specific moto or dyno run). Doing multiple test runs results in a much more finely tuned setting. Doing two or three runs is ideal. ( 3) Presets. The PIM2 holds two maps at a time, com- ing preset with maps for Yosh’s slip-on and full exhaust systems. These presets can be replaced with your per- sonal maps, and switching back and forth can be done quickly without a computer. This is handy for testing new settings. The PIM2 and Data Box kit bring impres- sive new technology to motocross and yield benefits in the feel and crispness of the engine (although perhaps not in overall horsepower). MXA RATING