Hi Jack
The engine has bore of 1 7/8" (haven't worked out the stroke)
The backing plate for the magneto has SPEC No FW and can't read the other no's then under that serial 167498. The flywheel has SPEC No FW 1 39. Both have Wi
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co Electric Co on several places. Carburettor has AMAL LTD.
As you may be able to see the cowl has baffle in it to direct air flow I think you may be right that the motor is one of Royal Enfield's own.
Regards
Regards
