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Does anyone know if the 996 motor from a ST4s will fit into an 851 or 888 frame. I thought the old Monster frames were supposed to be the same or virtually the same as the 851, and 888. How do the ST frames compare to the old superbikes? I am thinking winter project.
 

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it should go in just fine. points i can think of:

engine bolts are 12mm, not 10mm and have nuts on both.
alternator is 3 phase.
single pickup, with conversion to dual a bit of a hassle - you need bits from a '99 or '00 sps. you can fairly easily rewire the ecu connector to work with a 1.6m and use a 996 eprom in conjunction with the 888/916/996/s4/st4/st4s green side feed injector throttle bodies. i'd get some connectors and run the 3 wire pick up into the two original 2 wire pick up connectors.
 
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