Like a number of other people here, I've got a bike I like, but with carburetors I hate. The bike is a 1982 Yamaha SECA 750 (I4 aircooled). The carburetors are 32mm Hitachis, for which parts are prettty much unavailable.
I bought one of the first 10 or so Microsquirts to be made available, and have finally started working on the rest of the project. I am trying to do this largely as a salvage yard project, so a lot of the parts are whatever I was able to find at the local scrapyard.
My plan is to use a fuel rail and injectors from a Hyundai Accent, as the injectors line up nearly perfectly with my intake ports. I also plan to use a single throttle body and a custom manifold, rather than ganged throttle bodies (how much downside am I likely to see from this in terms of high RPM power loss?).
Here's a picture of the (not yet completed - yes, it's copper) manifold and the fuel rail. I still need to make and install the throttle body mounting flange and injector ports on the manifold.
Originally I was planning to use Ford parts for the thottle body, IAV, etc, since I started this before Microsquirt was available and I was going to do the whole thing from scrap, but I have since decided that a Chevy Cavalier throttle body would be easier, as it has the IAV integrated. I'm going out this morning to try to find one.
I've got a Walbro P532 fuel pump that a friend gave me. It may be overkill, but it's nice and small, so I hope it will work out OK.
For ignition I was planning to use the two VR pickups off the crank and drive the wasted spark coils directly from the MicroSquirt. The MicroSquirt case is actually a near-perfect fit in place of the original CDI unit, so mounting is taken care of.
I would appreciate any advise or warnings. I am especially interested in ideas/tips about installation of the CLT sensor and O2 sensor.
Thanks,
Paul
