After quite a bit of work, I’ve come to the conclusion that the VT1300C throttle body won’t work for the PC800. The issue is that I can’t make a good radiused curve from the VT1300C throttle body to the PC800 engine intakes. The geometry of the VT1300C throttle body is just too wide compared to the intakes on the PC800. The only way I could make it work would be to hack apart the VT1300 injection runner and change the angle between the two outlets so that I could get some smooth curve to run down to the intakes on the engine.
Luckily Plan B was still kicking around in my parts bin. I have a PC800 carb set that I gutted and installed injector bungs on quite some time back. I had run into problems before but with a little ingenuity and using some parts of the VT1300C throttle body, I can make it work.
I will be using the injectors and associated hardware from the VT1300C throttle body and the TPS sensor from a Honda CBR600RR throttle body I had kicking around. I need to go to the parts store to pick up some all thread of appropriate diameter, some more JB weld, a bunch of nuts and washers, and some rubber washers to seal between the injectors and the PC800 throttle body hack. It won’t be pretty in the end but I’m fairly confident this solution will work.
It’s unfortunate that the PC800 can’t accept the VT1300C throttle body. My intent with using the VT1300C throttle body was to find a nearly drop-in replacement so that other people can do the same modifications to their PC800s. Without finding that elusive drop-in replacement, I suspect that my PC800 will be the only fuel-injected bike of its kind to exist.