Quote:
Originally posted by breakout
996r (yr 2001) has a deep sump sandcast testastretta engine ,the 998/998s engines had the same bore 100mm as the 996r. The 998r has a shorter stroke (108mm bore) than the 996r longer stroke ,smaller (100mm) bore
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breakout - the 998R has a 104mm bore and 58.8mm stroke the same as the current 999R engine.
Read all about it
here.