Crankshaft, 58x110mm, Gp, full circle race with small end bearing, MRB


The MRB Race-Tour crankshaft is probably the best crankshaft ever made for a Lambretta, there is over 20 years of testing and development to produce these top quality crankshafts.

Our crankshafts use Japanese Road-Race type con rods and full race spec big end bearings with a slightly longer con rod length of 110mm.

The longer con rod gives an advantage to set up your Lambretta engine using our variable thickness cylinder base packing plates allowing adjustment to cylinder port timings and cylinder head clearances making for a better more efficient powerful engine.

The advantages of the MRB Race-Tour crankshafts are:

  1. A full circle, high compression balanced crankshaft giving a smoother more powerful engine.
     
  2. Con rod and bearing well within any power outputs of a Lambretta, Road or Race.
     
  3. Tighter assembly clearances to help prevent crankshaft twist.
     
  4. This crank has a standard stroke of 58mm and comes with the best small end bearing available.
 Crankshaft, 58x110mm, Gp, full circle race with small end bearing, MRB
MRB0601K
£ 443.09
Price: £ 369.24 Ex Vat
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Features

  • Hardened.
  • Lightened.
  • Balanced.
  • Precision made with increased crank pin tolerances.
  • Uses Japanese Yamaha 110mm con rods
  • Uses Japanese racing big end bearings.
  • Uses wider crank webs.
 
 

Technical

  • Designed by Mark Broadhurst and manufactured in the UK by Alpha bearings made from solid modern steels.
  • CNC machined.
  • Precision ground.
  • Assembled to exact tolerances.
 
 

Development History

  • Mark Broadhurst has been at the forefront of uprated crankshaft development from 1985.
  • He has invented and made every known con rod conversion.
  • These modified crankshafts include Innocenti, MDP, MEC, Omega, Mazzucelli, SIL, Evergreen and AF.
  • This long period of development found problems with every one of these crankshafts to where we needed a more reliable product.
  • It wasn't until SIL and Italian manufacturers moved from 22.9mm crank pins to 22mm crank pins that other dealers copied our ideas.
  • The amount of work load and never ending crank web failures forced us to design our own Race-Tour crankshafts.
 
 

Reasons to Buy

  • Balanced.
  • Lighter.
  • Precision made.
  • Using Japanese con rods and racing bearings.
  • Longer con rods mean more versatility when setting port timings and squish clearances.
 
 

Tips

  • Always use new drive and flywheel bearings when fitting a crankshaft.
  • Always use new seals when fitting a crankshaft.
  • Fit a crankshaft using a drive side pulling sleeve.
  • Oil the big end bearing, shims and seal surfaces before fitting.
  • Spin the crankshaft as you pull it into the drive side bearing.
  • Once fitted turn the crank to make sure it spins free.
  • Make sure there is more than .025" clearance between crank webs and casings.
  • We sell 0.5 and 1.0mm mag gaskets to obtain clearance.
 
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Alessandro on 10 Sep 2008 asked "I have a question about "Crankshaft 58x110mm Gp full circle race with small end MRB":Hi Mark,how does it work with a small block mugello 186?Regars,Alex"

MB Group, Serious Outdoors Ltd replied: It should work perfect, you will need a cylinder packing plate as the con rod is 110mm longer that standard but works perfect.

 


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