Motorcycle - Race and Road
British, European and American


  •  Race bike tuning & preparation
  •  Custom engine builds
  •  Engine rebuilds
  •  Methanol engines a specialty
  •  Custom designed extra strong, extra stiff race cranks
    •  Line boring and inserts for main bearing upgrades
    •  Modern durable needle roller big end bearings
    •  Carrillo conrod agent- custom rods
  •  Manx Norton works style 4 leading shoe brakes
  •  Custom engine modifications
  •  Custom engine parts designed and manufactured
  •  Ignition Systems:
    •  Magneto remagnetising and testing
    •  Magneto rebuilds for race bikes
    •  Programmable electronic ignitions
    •  Rev limiters
    •  Data logging

J.A.P. Racing and Sports Engine Specialist


  •  New engines built to order
  •  Old engine rebuilds
  •  Extra rigid racing cranks give:
    •  Improved durability
    •  Improved vibration
    •  Improved performance
    •  Longer time between rebuilds
  •  J.A.P. race cams and timing gears
  •  Oil return systems

Speedway Engines:
1000cc J.A.P. model 8/80 for sidecars
500cc singles for solos

Cooper racing car engines:
1000cc J.A.P. model 8/80
1100cc J.A.P. Mk2

Morgan 3 wheeler car engines
If you don't see it listed, ask us!

Improved Works Norton Manx-Style 4 Leading Shoe Brakes
The best drum brake option



Download a current price list (PDF format) for the brakes with this link.


Extra-stiff extra-durable custom crank assemblies available
    No more "flappy moth" power-sapping cranks!

 Improved performance
 Decreased vibration levels
 Improved main bearing life
 Improved big end bearing life
 Modern interference construction
 Quality caged needle roller bearings
 Lower risk of crankpin fatigue failure
Main bearing improvement and updates
 Large unstepped and unshouldered crankpins
 Larger diameter mainshaft options available
 Catering for Historic pre-1960 road and race engines
 Norton, BSA, Matchless, AJS, NSU, Jawa, ESO, Ariel and others
 Cooper J.A.P. V twin race car engines and other J.A.P. V twins a speciality




J.A.P Engines

New J.A.P. model 8/75 and 8/80 engines
Original J.A.P. engine rebuilds, upgrades and tuning



J.A.P. 1934 model 8/75s as used in Broughs and Morgans under construction and available soon

This 1000cc J.A.P. with our replica model 8/80 J.A.P. engine has been very successful on the tracks, summer and winter, since 2010

J.A.P engines, old and new!

You can watch and hear the outfit in action at Gillman Speedway  here.

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For more information email Greg by using

All products are  made to order.
A 50% deposit per item is required and the deposit is non-refundable.
The balance and all shipping/handling fees are due when finished. 
Your items will ship when full payment is received.

Note: All items are intended for competition use.

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2010-2015 Michael Moore, last update for this page 25 April 2015