| Description | 100E | Pop | Prefect |
| Engine ( Good) from | £450 | £500 | £500 |
| Engine (rebuilt/exchange) | P.O.A. | poa | poa |
| Engine core unit | £100 | £100 | £100 |
| Gear box | £45 | 50 | £50 |
| Clutch complete unit 3pc (new) | £200 | £200 | £200 |
| Clutch complete unit 3pc (second hand) | £30 | £30 | £30 |
| Slave cylinder (new) | £55 | ||
| Slave cylinder (second hand) | £10 | ||
| Clutch flex pipe(new) | £15 | ||
| Engine paint | £15 |
| Description | 100E | Pop | Prefect |
| Cylinder head | £20 | £20 | £20 |
| Cylinder head 8HP | £45 | ||
| Oil filter | £5 | £39 | £39 |
| Oil filter conversion plate | £30 | £30 | |
| Oil pump (second hand) | £10 | £10 | £10 |
| Oil pump (reconditioned) | £80 | £65 | £65 |
| Oil filters pipes (new) | £42 | £42 | |
| Oil filter pipes (second hand) each | £5 | £5 | |
| Valves (new) | £15 | £29 | £29 |
| Valves (second hand) | £2.50 | £5 | £5 |
| Valve springs set (second hand) | £10 | £10 | £10 |
| Valve springs set (new) | £22 | £24 | £24 |
| Tappet assy | £146 | ||
| Tappet set ajustable | £132 | £132 | |
| Piston and rings | P.O.A. | P.O.A. | P.O.A. |
| Timing chain (new) | £18 | £18 | £18 |
| Camshaft bearing | £75 | £75 | £75 |
| Camshaft (new) other profiles available | £130 | £130 | £130 |
| Camshaft (Sports) | £150 | £150 | £150 |
| Core plugs | £3.30 |
| Description | 100E | Pop | Prefect |
| Gasket head set | £25 | £25.50 | £25.50 |
| Gasket head set 8 hp | £26 | ||
| Gasket bottom set | £20 | £20 | £20 |
| Ring gear and flywheel | £20 | £20 | £20 |
| Crankshaft | £20 | £20 | £20 |
| Ring Gear New | £48 | £48 | £48 |
| Crankshaft bearings | £60 | £60 | £60 |
| Con rod (second hand) | £30 | £30 | £30 |
| Con rod (new) | P.O.A | P.O.A | P.O.A |
| Exhaust/inlet manifold | £50 | £40 | £40 |
| Engine mounts pair(new) | £56 | £36 | £36 |
| Engine mounts pair(second hand) | £28 | £18 | £18 |
| Gearbox mount (new) | £30 | £30 | £30 |
| Gearbox mount (second hand) | £10 | £10 | £10 |
| Description | 100E | Pop | Prefect |
| Conversion carburettor | £125 | ||
| Carburettor (reconditioned) | £145 | £145 | £145 |
| Carburettor | £45 | £40 | £40 |
| Air filter | £10 | ||
| New chrome conversion | £25 | £25 | £25 |
| Air filter complete kit (inc.adaptor) | £45 | £45 | |
| Speedo cable (new) | £22 | £22 | £22 |
| Speedo cable (second hand) | £9 | £9 | £9 |
| Fan belt | £6 | £14 | £14 |