1989 Honda PC800 Pacific Coast – Page 33 – Not Your Average Engineer

April 19, 2015

Getting Closer with the Honda Pacific Coast PC800 Fuel Injection Tuning

I spent some time today on my Honda PC800 fuel injection conversion project. I am getting the tune file together so that I am ready to take the bike to a dyno for final tuning. The biggest things that I still need to address are 1) tidy up the wires, 2) adjust the TPS sensor so that it can sense low throttle positions, 3) finish up the primary tune, 3) figure out the enrichment settings for startup/warmup and acceleration.

I’m going to try setting up a very old NetBook running Ubuntu with TunerStudio so that I can have the ability to modify my tune while I’m out and riding. Also that will allow me to more easily log data. At some point I’ll probably get the BlueTooth wireless adapter to be able to log data with my phone while I ride.

Slowly but surely my bike is coming along! By summer, I think I’ll be out and riding again.

February 24, 2015July 9, 2020

Cat Rack, Rest, and Light

There is a new option for Honda Pacific Coast PC800 rear racks, backrests, and high tail lights. Richard Shavor (Facebook, Ebay) has started producing the Cat system of rear racks, passenger backrests, and high tail lights for the PC800. I have not personally tried one of his rear racks but the look like a good design and are definitely a good option for people wanting a rack for a PC. The backrest and third brake light also look quite good. To purchase this rack, contact Richard directly via Facebook or Ebay. Below are a few photos from Richard’s Ebay auctions for the racks.

Good-looking rack that appears to be made out of sheet metal and either painted or powder coated black. Note the weight-reducing holes on the sides and the slits in the top.

The Cat Light bolts onto the Cat Rack and has wiring to connect into the brake or running light circuitry of the bike.

The Cat Rest backrest attaches to the Cat Rack with four bolts and does not directly attach to the rest of the seat assembly.

The whole kit is available together as well.

December 9, 2014February 24, 2015

Building a Vacuum Reservoir for a Honda Pacific Coast Fuel Injection Conversion Project

This humble pipe will be the vacuum reservoir on my Honda Pacific Coast PC800 fuel injection conversion project. I have been working for some time on converting this carburetted bike to fuel injection. One issue has been a fluttering manifold air pressure reading from the Manifold Air Pressure (MAP) sensor when it is hooked directly to the intake runners. The solution is to have a vacuum chamber to smooth out the pulses from the opening and closing of the engine valves. The pressure readings will still be correct but without the huge flutter problems.

I JB Welded in brass fittings to the two screw ends of the PCV pipes. Once everything is dry, I will bolt it all onto the bike under the plastic.