The following Panther info is from "Modern Motorcycle Maintenance" by Bernal Osborne of Motor Cycling, Second Edition.

                PANTHER
        Model: 348cc, 75.
  Makers: Phelon & Moore Ltd., Cleckheaton, Yorks.

Tappet Clearance (cold):
        Inlet, nil.
        Exhaust, nil.

Valve Timing:
        Inlet opens before T.D.C., 10 degrees.
        Inlet closes after B.D.C., 45 degrees.
        Exhaust opens before B.D.C., 65 degrees.
        Exhaust closes after T.D.C., 15 degrees.

Tappet Clearances for Valve Settings (hot):
        Inlet, nil.
        Exhaust, nil.

Ignition Advance:
        35 degrees full advance.

Valve Guides Protrude from Cylinder Head:
        Inlet, .875 in.
        Exhaust, .875 in.

Cylinder Bore in Inches:
        2.7955 ins.
        Rebore to plus .010 in. when bore exceeds 2.8005 ins.

Piston Clearances:
        Top land, .0131 in. to .014 in.
        Top skirt, .005 in.
        Bottom skirt, .0043in.

Piston Rings:
        End gap, .011 in. to .016 in.
        Vertical play, .001 in. and .002 in. on scraper.

Main Bearings:
        Driving side: 1 in. bore plain journals.
        Timing side: 1 in. bore plain journals.

Mainshaft:
        End float, .030 in.

Big-end/Connecting-rod:
        Side play, .016 in. to .034 in.

Big-end Bearing:
        Type: Hardened steel, double roller.
        Recondition when noisy.

Gearbox:
        Bearings, types and sizes: 40mm by 17mm by 12mm.
                                   62mm by 1 9/32 ins. by 16mm. (ball races).
        Bushes, reamed to: .8475 in.+.001 in.; .6215 in.+.001 in.; .312 in.+.001 in.; .811 in.+.001 in.; .670 in.+.001 in.; .499 in.+.001 in.;.914 in.+.001 in.

Fine-limit Diameters:
        Connecting-rod: Little end, .750 in. + .001 in.
                                             -.0000 in.
        Camshaft bushes,        ..  .5625 in.+ .000 in.
                                             -.0005 in.
                                and .625 in. + .000 in.
                                             -.0005 in.
        Idler wheels    ..      ..  .5625 in.+ .001 in.
                                             -.0000 in.
        Tappet guides   ..      ..   .250 in.+ .001 in.
                                             -.0000 in.
        Cam-followers   ..      ..  .5625 in.- .001 in.

Left-hand Threads:
        Nil.

Special Tools Available from Makers for Comprehensive Overhaul:
        Dowty fork key.
        Valve spring remover.
        Engine sprocket remover.
        Main pinion extractor.
        Clutch spanner.
        Crankpin and engine shaft nut spanner.
        Tappet stud extractor.
        Ball race fitting tool.
        Dynamo pinion extractor.
        Exhaust nut spanner.

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