Piston kit, 64.00mm A, 39mm crown, Race-Tour for Lambretta reed 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 - 64.00mm grade A
  • Engine size - 186/190
  • Induction type - Reed type
  • 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 small block cylinders;

  • Cast iron 150/175/190 (reed conversion)
  • Race-Tour 190 (reed conversion)
  • SR/KA 175-190 (reed conversion)
  • Mugello 190 (reed conversion)
  • Casa 190 (reed conversion)
  • Imola 190 (single boost port kit ONLY)

Piston kit, 64.00mm A, 39mm crown, Race-Tour for Lambretta reed cylinders, MB

£ 157.96
Price: £ 131.63 Ex Vat

Temporarily out of stock

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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:

  • Imola 190 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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Questions? ( 3 )

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Ian on 03 Nov 2011 asked "A B C D, what is the difference? Regard "

MB Scooters Ltd replied: These pistons come graded to suit the cylinder bore size, on the cylinder there should be a letter A, B, C or D. Usually if the bore is not worn you match a piston to bore. A = A etc, if not sure sure let us measure the bore for you.

Massimo on 05 May 2009 asked "I have a question about "Race-Tour piston kit to suit reed valve type cylinders, 64.00mm A, MRB" Goodmoorning, my english is not very well. can i help me now i restorations small-block whit new kit " IMOLA", i prefer cange the piston because is not very good ..... How many kilograms weighs the piston ???"

MB Scooters Ltd replied: These weigh approximately 240 grams

Linda M on 24 Jun 2008 asked "My son has asked me to find out if this is the piston you have developed to overcome the problem with cracking experienced with the Imola piston. He needs a piston for his Lambretta LI, which had an Imola 185 cc piston which has cracked. It is for a Grade 'A' cylinder "

MB Scooters Ltd replied: Your correct, we have developed our piston to suit every Lambretta style engine and the main advantage is they do not crack.

To date I have never seen one of our pistons cracked and we have sold hundreds and have fitted them to engines twice as powerful as the Imola.

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