I have just finished converting the Rappy from dual 35mm FCR's to EFI with the help of KMS in Phoenix and thought I would give anyone who cared an update on the project (nutshell).

Components. 48mm throttle body w/dual 63lb injectors, Edelbrock intake adaptor, electric fuel pump, EFI computer, upgraded stator (for fuel pump), map sensor, IAT sensor (o2 and other sensors available), wiring harness, air intake and a few other goodies.

Applications (at present): Honda 400ex, Yamaha Raptor, Bombardier DS650, Yamaha Banshee (with battery system). YFZ and others forthcoming.

Cost. $1499 (compared to $1100 for dual FCR's, filters and billet adaptor man.)

Capabilities: Full 3D and 8x8 fuel mapping with data logging (no ignition control at this time, uses factory CDI or Dynatek) and a host of other standard features found in engine management systems. RS232 PC based software. Third part GUI's and Palm Pilot programs are available free on the NET.

Why EFI? Flexibility in tuning for various fuels (I already have gas, methanol and methanol +20% nitromethane maps), altitude adjustment correction and a host of monitoring parameters make this an outstanding choice. Not to mention if you want to go turbo this is a must. Fuel economy also is greatly improved for those using methanol as opposed to those running Powerjets and no main jet carb set-ups. Did I mention data-logging?

Ride Review: We tuned the bike on a load-based Dynojet as to simulate loads while duning or hill-shooting, which was especially critical for the methanol/20% nitromethane maps as they were off a bit with standard inertia dyno tuning. Took the 727 Raptor and a 483 EX to the Hill this past Saturday for some actual tuning on the hill and general ride-ability. Significant increase in throttle response and low-end torque (as if it needs more) resulted in the best the bike has run since it went 727 two years ago. Smooth transitions between gears, no issues with tires spinning when getting air through the bumps. No fuel surging over whoops and it pulled incredibly strong through the top of the Hill. While not a complete report by no means, I have my FCR's up for sale and am thoroughly convinced this is a great alternative for those that like being on the edge. I have no idea of long term reliability of the computer or components at this time, but I sure like the idea of hooking up the laptop at the hill and adding a little fuel on the big end. The obvious downside is all the new components and having to understand a bit about tuning a computer.

I think the kits will be available or are available now through billetbikeworks.com.