Piston kit, 70.50mm, 39mm crown, Race-Tour for Lambretta reed type cylinders, MB


This is one of our MB forged Race-Tour piston kits these are the strongest most versatile piston ever made for a Lambretta scooter. It provides better than Japanese quality without the additional expense of having to change your con-rod.

Piston dimensions;

  • Piston size - 70.50mm
  • Engine size - 225
  • Induction type - Reed type
  • Piston crown height - 39mm
  • Piston dome - 7mm
  • Skirt - 70.50mm
  • Con rod length standard - 107 110mm
  • Gudgeon pin - 16mm
  • Small end bearing width - 20mm
The piston kit includes;

  • Piston
  • Piston rings
  • Circlips
  • Gudgeon pin

Suitable for large block cylinders;

  • Cast iron 200/225 (reed conversion)
  • Race-Tour 200/225 (reed conversion)
  • SR/KA 200/225 (reed conversion)
  • Mugello 200/225 (reed conversion)
  • Monza 200/225 (replate oversize)
  • TS1 200/225 (replate oversize)
  • RB 225 (replate oversize)

Piston kit, 70.50mm, 39mm crown, Race-Tour for Lambretta reed type cylinders, MB

£ 140.96
Price: £ 117.47 Ex Vat

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  • Stronger and lighter.
  • Uses 2 wire non breakable piston rings.
  • Uses wire no tag piston circlips.
  • Uses the same gudgeon pin through out the piston range.
  • Special sizes vary from 64mm to 71mm.

    These Reed valve type pistons suit:

  • Monza 200, 225 cylinder kits.
  • TS1 200, 225 alloy cylinder kits.
  • RB 225 alloy cylinder kits
  • Any old Retro cast reed valve conversion cylinders.


  • Made from the latest modern alloy materials for 2-stroke engines.
  • Forged for strength and are the strongest purpose made Lambretta piston available to date.
  • The most versatile purpose made piston for a Lambretta engine.

Development History

  • Fed up with poor piston quality and supplies in the past.
  • MRB have invested heavily in these pistons.
  • Designed by Mark Broadhurst and piston supplier Cegway who has a history of Formula one piston design.
  • Tooling was made in the UK, shipped to America where the forgings are done, and machined once back in the UK.

Reasons to Buy

  • The strongest most versatile piston ever made for a standard or tuned Lambretta.
  • A full range of sizes in 0.5mm increments from 64mm to 71mm.
  • Piston kits weight between 244g and 286g.
  • To date over 500 pistons have been made with not one broken piston.


  • Recommended piston to bore clearance for Cast iron cylinders is .003'' - .0035''.
  • Recommended piston to bore clearance for alloy cylinders with iron liners is .002'' -.0025''
  • Recommended piston to bore clearance for Nicasil or Ceramic plated cylinders is .0015 - .002''
  • Use only unleaded fuels, avoid the super unleaded type fuels.
  • Use fully sinthetic oils
  • For long lasting reliability, once run in check your ring gap at 1000 - 1500 miles, replace rings if the ring gap has increased beyond acceptable limits.


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