top of page

MY CART

Norton Engine Data

The table below shows data for Norton singles from 1928 to 1955.

 

A couple of notes:

  • Valve and ignition timing given in inches for all models except the 30 and 40, these are given in degrees.

  • Notation for valve timing as follows:

    • IO - Inlet Opening (Before TDC)

    • EC - Exhaust Closing (After TDC)

  • When tappet clearances are given as ‘zero’ pushrods should be free to rotate with no perceptible up and down movement.

  • Tappet clearances are running clearances and taken when cold. Clearances for setting valve timing may vary from these figures. Consult your manual to confirm.


Blue table with Norton motorcycle specs: models, years, capacity, bore, stroke, compression, valves, timing, and tappet clearance. Rows and columns.

Return to Norton Technical Guides or Technical


 
 
 

Comments

Commenting on this post isn't available anymore. Contact the site owner for more info.
bottom of page