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The engine is a amazing step forward. First you notice the XR 750 styled heads and pushrod
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covers. Than the giant 62 mm airhorns of the double throttle bodys.
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The rockerbox- and primary- covers are casted in extra lightweight Magnesium.
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The heads are constructed to accept downdraft feeding with equal lenght and turn.
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The oilpump position and the drive change from radial to axial, requires a new camecover and
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the ignition is now mounted on the cranksprocket of the primary, what allows propper triggertiming.
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All mountings and the uniplanar construction with tiebars is like on the stock XB models.
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Notice the huge carbon airhoses going from the Naca airinlet to the airbox to feed the 1.350cc V Twin.
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The cylinders with a wider bolt pattern accept maximum bore (103,6mm) what Buell mixed with
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the short stroke of the stock XB9 (79,4mm). That to run the high engine speed a Sporttwin need.
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The velocity stacks are mounted in a small airbox connected to the carbon hoses. The injectors are
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located as near as possible to the intake valves. Position of the butterflies comes by TPS sensors.
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Notice how much bigger the “double R” inlet valve is comparing to the stock XB.
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They are also longer to accept more lift and they are special flow optimized.
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Behind the frontfairing the catchcans for the engine breathers and the fueltank are
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located. On the left a 11 line aluminium oilcooler is mounted to reduce the oiltemperature.
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The wave analyzed Header- and Exhaussystem use equal lenght of the header to optimize filling
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of the cylinders. The header- pieces are mounted my springs to compensate extension.
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All engine components are lightweight construction to minimize the rotating masses.The
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RR Pistons are carrying a asymetric dome fitting in the Hemi bathtub combustion chamber.
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Today engine management components and data collecting are the key of succes. Buell use a small oqo handheld computer
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to administrate the fuell/ignition system. A great option is to fix the oqo for testrides on the bike to run datarecording of all sensors.
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