Complex sentence: These Runners were all SP versions and featured a Dell'Orto 17,5 mm carburetor which was limited but easy to undo and were fabric fitted with a 50 cc Fast Cylinder.
Split into simpler sentences: These Runners were all SP versions and featured a Dell'Orto 17,5 mm carb which was limited but easy to undo. And were fabric fitted with a 50 cc Fast Cylinder.