Triumph Pre-Unit Inner Chain Case Cover (1) - 57-477 Alloy Norton & More during the

Norton & More during the late 1940's to 1950's with Magnetos & Dynamos

No need to use original Lucas rotor or stator with this unit

T120R & T120TT) from 1964-1966 equipped with dual Amal Monoblocs

Stator and rotor are beautifully machined from billet alloy making this kit "top of the line"

new magnetic filters and copper washers (all sold each)

Triumph Pre-Unit Inner Chain Case Cover (1) - 57-477 Alloy Norton & More during theNew for late 2025, we are now stocking Triumph pre unit inner chain case covers. Each cover has been casted and machined in England. Very high quality ready to be installed. Fits Triumph pre unit twins that feature a "dynamo". Please make sure our part number matches your parts book and bike application Please note that inner chain case covers are sold each as pictured **Features** Made in England Replaces Triumph part numbers 57 477 & t477