![]() The Vision's 4-stroke V-twin spins at 5300 RPM at 60 mph in 5th gear. Here are some initial calculations that prove it is quite possible to beat the Durango. Here are some great Yamaha Vision XZ550 websites:Īir and Fuel Consumption Near Standard Temperature and Pressure Air Volume Per Intake Stroke (cc) 275 After further discussions, they bet that it might work, but it would not beat the gas mileage of a Dodge Durango 5.9L V8 about 15 MPG. Their initial reaction was “why bother?” and they bet that it would never work. I came up with a rough implementation plan and bounced it off a few of my engineer coworkers. I researched electronic fuel injection (EFI), pulse width modulation, microcontrollers, fuel injectors, fuel pumps, and carburetors. Then I realized that the obvious solution was to build my own fuel injection system. I also had a desire to learn to use microcontrollers for work-related projects. I had my eye on some newer bikes with fuel injection for a while. I like carburetors when they work, but I find them technologically inferior when they do not. In retrospect, there were probably some vacuum seal problems in the dry-rotting rubber intake manifolds and in the YICS chamber and tubing. The other great thing about this rare bike is the total lack of carburetor rebuild kits. The local Yamaha dealer wanted almost $400 to rebuild the carbs, which would have been the easy way out until they needed cleaning again. After two dis-assemblies and cleanings, the best I could manage was a putter or two while trying to start. It turns out that I am not a master carburetor cleaner. I bought the Haynes manual, 5 bottles of carburetor cleaner, and I tried my hand at cleaning the carburetor. It ran on starter fluid or sprayed gasoline, but not on its own. I bought a very used Vision in the fall of 2003 for somewhere between $100 and $200. Yes, this is a lot of effort for minimal return, but I find it interesting. I snagged this pic from riders of vision because mine is currently disassembled. The photo above is what I want my bike to look like, but I have a lot of work to get it there. This is what I want my Vision to look like. Projects Publications Resume Contact About Youtube Donate 1982 Yamaha Vision (XZ550) Fuel Injection Conversion
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