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

                PANTHER
        Model: 248cc, 65.
  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:
        Inlet, nil.
        Exhaust, nil.

Ignition Advance:
        36 degrees full advance.

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

Cylinder Bore in Inches:
        2.3622 ins. +.0005 in.
                    -.0000 in.
        Rebore to plus .010 in. when bore exceeds 2.3672 ins.

Piston Clearances:
        Top land, .010 in. to .011 in.
        Top skirt, .0035 in. to .0041 in.
        Bottom skirt, .003 in. to .0034in.

Piston Rings:
        End gap, .010 in. to .015 in.
        Vertical play, .0017 in. and .002 in. on scraper.

Main Bearings:
        Driving side: 1 in. diameter plain.
        Timing side: 1 in. diameter plain.

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.

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.

Gearbox:
        Bearings, types and sizes: 35mm by 15mm by 11mm.
                                   2 1/4 by 30mm by 7/16 in. (ball races).
        Bushes, reamed to: .752 in.+.001 in.; .500 in.+.001 in.; .6275 in.+.001 in.; .7025 in.+.001 in.; .687 in.+.001 in.; .812 in.+.001 in.;.5915 in.+.002 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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