Piston kit, 70.00mm, 39mm crown, Race-Tour for Lambretta piston port 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 - 70.00mm
  • Engine size - 225
  • Induction type - Piston port
  • Piston crown height - 39.00mm
  • Piston dome - 7mm
  • Skirt - 70.50mm
  • Con rod length - 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
  • SIL 200
  • Rapido Road/Race 200/225
  • Mugello 200 (replate oversize) 225
  • Race-Tour 200 (replate oversize) 225

It is not designed for reed valve type cylinders but is strong enough to be modified for one.

Piston kit, 70.00mm, 39mm crown, Race-Tour for Lambretta piston port cylinders, MB

£ 155.12
Price: £ 129.27 Ex Vat

Temporarily out of stock

Notify Me

Related Items (6)


  • 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.
  • 15 sizes from 64mm to 71mm.

    Piston port pistons suit:
  • SR/KA 200, 225 alloy iron lined cylinders.
  • Mugello 200, 225 alloy cylinders.
  • Standard 200 and Factory Stage 4 cylinder kits.
  • Rapido 225 cylinders.
  • Any old type tuned cast cylinders kit.
  • Our new Race-Tour 220 alloy cylinder kit.


  • Made from the latest modern alloy material for 2-stroke engines.
  • The strongest purpose made forged Lambretta piston available to date.

Development History

  • Fed up of poor piston quality and supplies in the past, MRB 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 and 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.


there are no customer reviews at present
want to be the first to offer a review?
to place a review click here

Questions? ( 1 )

Do you have a Question?

If you would like to ask us a question about this product, please feel free to click here to ask a Question Now!

Nick n on 05 Sep 2011 asked "Hi there I have a rapido 225 and am interested in a piston for this, what should the absolute maximum and minimum piston to bore clearance be for this piston with a rapido 225. What does a,b and c size differences "

MB Scooters Ltd replied: Min 0.002'' Max 0.005'' a, b, c and d are slight over sizes but we do not do these for piston ported cylinders.

If you feel something is not correct with this product description or image then please contact us using the same link