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85cc Cylinder Kit- Vespa PK/ Smallframe 50cc


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RMS Blue Line 85cc cast-iron cylinder kit for Vespa PK/ Smallframe and Ape 50cc.

50mm bore. 3 transfer ports.

This cylinder is suitable for 43mm stroke crankshafts.

Includes: cylinder, head, piston kit and gasket set.

  • Vespa 50
  • Vespa PK 50
  • Vespa PK 50 XL
  • Q. We were wondering if you are able to suggest the best spark plug and carb jetting for this kit? We have the 16.16 carb.
  • A.

    These use a NGK B-HS short reach spark plug.
    Jetting wise will be trial and error when upgrading the cylinder kit and would also depend on other modifications fitted to the bike. If you are just re jetting it for the cylinder kit I would start with roughly 10% bigger than the current size fitted and work from there.