Lambretta Clutch crown wheel (sprocket) 46 tooth (4, 5, 6 plate) MB


We were so disappointed with the standard of available sprockets that we decided to have our own made.

They are made in the UK to a very high standard.

They are designed to be used with the more reliable Li Sx type clutch bearings rather than the GP style bush.

This sprocket can work with 4 or 5 plates or 6 plate internal type clutch conversions and has 46 teeth.

Designed by Mark Broadhurst and MB.

Lambretta Clutch crown wheel (sprocket) 46 tooth (4, 5, 6 plate) MB
  • Lambretta Clutch crown wheel (sprocket) 46 tooth (4, 5, 6 plate) MB
  • Lambretta Clutch crown wheel (sprocket) 46 tooth (4, 5, 6 plate) MB

£ 114.40
Price: £ 95.33 Ex Vat

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  • Light weight with hardened clutch bearing bush so improved needle roller bearings can be used.
  • Machined deeper so 4 or 5 or 6 plates can be fitted and helps prevent clutch drag.


  • Designed by Mark Broadhurst.
  • Made in the UK using modern steels, lightened and precision CNC machined.

Development History

  • Fed up of poor inferior products we designed our own.
  • What ever product was used extra machining and grinding was required.
  • The precision of the crown wheel is very important for chain and clutch life.

Reasons to Buy

  • Lightweight.
  • Strong.
  • Hardened.
  • Precision machined.
  • Adjustable lift.
  • No rock.
  • Easy fit.


  • Always dial gauge the crown wheel with the front drive sprocket to improve chain life.
  • Always check sprocket lift and shim up to suit.
  • Always fit new end plate bearings and clutch needle bearings.
  • Make sure both clutch friction, steel, pressure plate fit and slide up and down freely.
  • Always soak clutch plates in ST90 for 24 hours before fitting.
  • Steel tabs on top and bottom friction plate can be bend 20 degrees to aid the clutch.
  • Always use a clutch holding tool to tighten the clutch nut.

Reviews ( 3 )


5 star 1. Max 01 Oct 2008 

Ho acquistato questa corona da 46 denti; veramente sodisfatto sia nella sua lavorazione e nel materiale utilizzato...( leggerissima ) Max


5 star 2. C C 17 Jul 2020 

This is a very high quality crown wheel and just as I expected from MB, Matched by excellent customer service. I am very happy with my purchase.


5 star 3. Paul P 06 May 2021 

Excellent quality crown wheel 5stars

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Questions? ( 4 )

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!

Kieron on 06 Jun 2018 asked "Do you need a chain case spacer to fit one of this 5/6/7 plate clutch crown wheels and can you use a stand spider with it?"

MB Scooters Ltd replied: No spacer needed, they fit as standard and yes you can use a standard spider

Dave on 10 Oct 2016 asked "Purchased one of these a few years ago from Jet200 Want to replace my plates and steels as I have been having problems with the operation First I noticed the tiny circlip on top of the pressure plate is broken so I will need to order one from you My real problem is creeping when clutch pulled. When I tighten the cable the clutch slips and the bike screams at high RPMS It feels like there is not enough room in there. What combination of plates, steels and top steel can you recommend for a 5 plate clutch?"

MB Scooters Ltd replied: If you open the link and read the 'Tips' section it should help you.,-6-or-7-plate,-mb/mrb0758k.html

Neal on 26 Sep 2015 asked "will this crown wheel fit the sil engine without any additional work apart from the use of the li needle roller bearings?"

MB Scooters Ltd replied: It should be a straight fit

Giancarlo on 20 Oct 2008 asked "I have a question about "46 tooth 4 / 5 plate lightened crownwheel MRB" Hi Mark, could you explain me what are the benefits about using a lightened crownwheel, on a semi-tuned motor? Thank you."

MB Scooters Ltd replied: The theory is reduce weight from the moving parts to increase horse power.

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