WWW.TIGERCUBANDTERRIER.COM
  • Welcome
  • Introduction
  • The Story begins...
  • An Interview with Mr Turner
  • Model information
    • Terrier T15
    • Tiger Cub T20 >
      • 1954/55
      • 1956
      • 1957
      • 1958
      • 1959
      • 1960
      • 1961/62
      • 1963-on
    • Competition Cub T20C
    • Sports Cub T20S
    • Woods Cub T20W
    • Sports Lights Cub T20SL
    • Trials Cub T20T
    • Street Scrambler T20SS
    • Scrambler T20SR/T20SC
    • Trials & Scrambler TR20/TS20
    • Sports Home Cub T20SH
    • Mountain Cub T20SM/T20M
    • War Department (T20WD/T20M WD
    • Bantam Cub T20B
    • T20B Super Cub
  • Police Machines
    • The RUC Cubs
  • Buyer's Guide
  • Resources
  • Technical
    • Machine Numbers
    • Gear Clusters
    • Front Forks
    • Front Fork Oil Change
    • Condensers
    • Finding T.D.C.
    • External Oil Filter
    • Lucas Energy Transfer
    • 12V Conversion
    • Fitting Indicators to a Tiger Cub
    • Fitting a Craven Luggage Rack
    • Spark Plugs and Sparks
    • Know your Alternator
    • Oil Pumps and Lubrication
    • PRS8 Switch Repair
    • T20 Oil Filter Kit
  • Your Stories
    • My Wee Cub
    • Denny's Terrier
    • A T20C Story
    • TR20 Cub Sorted
    • Saving Sylvia
    • My 1959 Tiger Cub
    • My First Restoration
    • Found in a Scrap Yard
    • My First Bike
    • Brand new out of the Box
    • On the Road after 40 years
    • First bike I ever Rode
    • The' Tarbuk' Conversion
    • A Tiger Cub in a Box
    • Aunt Tiny
    • Well-travelled Terrier
    • Mashooq's Tiger Cub
    • 48 Years with my Cub
    • Ready for the Arbuthnot
    • My Collection of Cubs
    • Mountain Cub and Cafe tales
    • My favourite Cub of all
    • A Cub in Norway
    • Beginning of a Terrier Restoration
    • An Ambush of Cubs
    • A T20C Cub (probably!)
    • A Moment Frozen in Time
    • Finally after 56 years!
    • Still riding Cubs after 60 years
    • A Lakeland Venture
    • Back to my Teens!
    • Terrier Tribulations!
    • Brian's Cub Special
    • Sold, Bought, Restored
    • It started with a Cub
    • A Family Connection
    • Cubs & Terriers in the Family
    • Benny's Tiger Cub
    • Tiger Cub Trials!
    • Getting my '59 Cub in '58
  • The Princeton Cubs
    • Class of 2009 - 2010
    • Class of 2010 - 2011
    • Class of 2011 - 2012
    • Class of 2012 - 2013
    • Class of 2013 - 2014
    • Class of 2014 -2015
    • Class of 2015 - 2016
    • Class of 2016 - 2017
    • Class of 2017 - 2018
    • Class of 2018 - 2019
    • Class of 2019 - 2020
  • Sporting Tales
    • Bonneville Speed Record
    • ISDT Success
    • Success in the Scottish
    • My 1961 International Six Days
  • TC&T Mysteries
    • The Terror
    • Who is this?
    • Mountain Cub Mystery
  • The Bermuda Connection
  • Welcome
  • Introduction
  • The Story begins...
  • An Interview with Mr Turner
  • Model information
    • Terrier T15
    • Tiger Cub T20 >
      • 1954/55
      • 1956
      • 1957
      • 1958
      • 1959
      • 1960
      • 1961/62
      • 1963-on
    • Competition Cub T20C
    • Sports Cub T20S
    • Woods Cub T20W
    • Sports Lights Cub T20SL
    • Trials Cub T20T
    • Street Scrambler T20SS
    • Scrambler T20SR/T20SC
    • Trials & Scrambler TR20/TS20
    • Sports Home Cub T20SH
    • Mountain Cub T20SM/T20M
    • War Department (T20WD/T20M WD
    • Bantam Cub T20B
    • T20B Super Cub
  • Police Machines
    • The RUC Cubs
  • Buyer's Guide
  • Resources
  • Technical
    • Machine Numbers
    • Gear Clusters
    • Front Forks
    • Front Fork Oil Change
    • Condensers
    • Finding T.D.C.
    • External Oil Filter
    • Lucas Energy Transfer
    • 12V Conversion
    • Fitting Indicators to a Tiger Cub
    • Fitting a Craven Luggage Rack
    • Spark Plugs and Sparks
    • Know your Alternator
    • Oil Pumps and Lubrication
    • PRS8 Switch Repair
    • T20 Oil Filter Kit
  • Your Stories
    • My Wee Cub
    • Denny's Terrier
    • A T20C Story
    • TR20 Cub Sorted
    • Saving Sylvia
    • My 1959 Tiger Cub
    • My First Restoration
    • Found in a Scrap Yard
    • My First Bike
    • Brand new out of the Box
    • On the Road after 40 years
    • First bike I ever Rode
    • The' Tarbuk' Conversion
    • A Tiger Cub in a Box
    • Aunt Tiny
    • Well-travelled Terrier
    • Mashooq's Tiger Cub
    • 48 Years with my Cub
    • Ready for the Arbuthnot
    • My Collection of Cubs
    • Mountain Cub and Cafe tales
    • My favourite Cub of all
    • A Cub in Norway
    • Beginning of a Terrier Restoration
    • An Ambush of Cubs
    • A T20C Cub (probably!)
    • A Moment Frozen in Time
    • Finally after 56 years!
    • Still riding Cubs after 60 years
    • A Lakeland Venture
    • Back to my Teens!
    • Terrier Tribulations!
    • Brian's Cub Special
    • Sold, Bought, Restored
    • It started with a Cub
    • A Family Connection
    • Cubs & Terriers in the Family
    • Benny's Tiger Cub
    • Tiger Cub Trials!
    • Getting my '59 Cub in '58
  • The Princeton Cubs
    • Class of 2009 - 2010
    • Class of 2010 - 2011
    • Class of 2011 - 2012
    • Class of 2012 - 2013
    • Class of 2013 - 2014
    • Class of 2014 -2015
    • Class of 2015 - 2016
    • Class of 2016 - 2017
    • Class of 2017 - 2018
    • Class of 2018 - 2019
    • Class of 2019 - 2020
  • Sporting Tales
    • Bonneville Speed Record
    • ISDT Success
    • Success in the Scottish
    • My 1961 International Six Days
  • TC&T Mysteries
    • The Terror
    • Who is this?
    • Mountain Cub Mystery
  • The Bermuda Connection
WWW.TIGERCUBANDTERRIER.COM
Know your Alternator
​All Tiger Cub and Terrier models used a 6-volt electrical system from either Lucas or Wipac. The rotor being mounted on the left hand side of the crankshaft running in a stator located inside and fastened to the primary chaincase.
Picture
​Irrespective of manufacturer, both makes of alternator are physically and electrically interchangeable. The Wipac stator is of very similar dimensions to the Lucas 74mm item*, although it has slightly different coloured wires to the Lucas ones.
If replaced with a Lucas stator there may well be a slight increase in the air gap between stator and Wipac rotor, but this should not noticeably affect output.
 
* The early Lucas RM12-15 series alternators used a small 70mm diameter rotor. Later RM-18 to 19 units used a larger 74 mm rotor and were fully encapsulated to protect the windings and help prevent the coils coming loose.
 
The RM19 being the most powerful 6-volt unit and much thicker then previous versions. Having said that, all the round frame RM alternators use the same mounting pattern and are interchangeable.
Picture
​On a number of competition models an Energy Transfer system was used, which enabled the machine to be run without a battery. These models utilised a specially wound alternator stator  and coil, and a short open-period contact breaker.
The wiring colours for this system are Brown/Blue, Black/White and Red.
 
Running clearance
There must be a minimum 0.2 mm (0.008”) clearance between the rotor and stator all the way round. Difficult to check on a Tiger Cub or Terrier due to the separate positioning of items, but if a problem is suspected, remove the primary chaincase and check the rotor and stator faces for signs of rubbing or contact.
 
If signs are evident and whilst the primary chaincase is removed, clearance can usually be achieved by slightly loosening the stator mounting bolts and carefully tapping the metal surround of the stator nearest to the point of contact with a soft faced hammer before retightening.
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