pair of 90 bore cases from a zenith. still have original number in the 11000 range. have had a small amount of welding done in pictures. ask.
JAP Engine 1926 & 1929 Brochures Book V Twin Single Brough Superior Motorcycles
50MM Cylinder Assembly Compatible With GY6 Scooter Engine Replaces 90-4003
50MM Cylinder Non EGR Compatible With GY6 50CC 139QMB Scooter Engine Replaces 90-4002(Without Valve(69mm))
JAP Motorcycle Motorbike Engine Ohv - Sports (1928) Spare Parts Manual
JAP MODEL 80 TYPE 71 2-STROKE ENGINE FACTORY ILLUSTRATED PARTS LIST GB D F TEXT
JAP 5 55 Pepper Pot Exhaust Silencer stationary engine New Old Stock
