Royal Enfield 500 TWIN 1949 Workshop Maintenance Manual page 4

ROYAL ENFIELD WORKSHOP MANUAL
Cubic Capacity ... ...... ... ...... ... ......... 692 c.c.
Stroke ................. ... ................. .. ........ 90 m.m.
Bore ......... ... ...... ... .. Nominal
Actual 69.874 m.m./2.751 in.
(Rebore to .020 in. when wear exceeds .0065 in.
and again to .040 in. after further .0065 in. wear).
Compression Ratio ... ... ...
Piston Diameter-
Bottom of Skirt-Fore and Aft. 69.811 m.m.
Top Lands .. 69.32/69.27 m.m.
Skirt is tapered and oval-turned.
Piston Rings
Width-Plain Rings ................ ...
Scraper Ring ......................... ...
Radial Thickness .................. 2.883/3.085 m.m.
Gap when in unworn Cylinder .011 / .015 in.
Clearance in grooves
Renew Piston Rings when gap exceeds 1/16 in.
Various oversize Pistons and Rings available.
Piston Boss Internal Diameter ....... .7499/.7501 in.
Gudgeon Pin Diameter
ConRod Small End Internal Diameter .7507/.7505 in.
Big End Internal Diameter ........... 1.8535/1.8530 in.
Bearing Shell Internal Diameter 1.7515/1.7505in.
Crank Pin Diameter ............... ... 1.7500/1.7495 in.
Driving Side Main Ball Bearing
Type ............ ... ..... ... ...... ... ....... S.K.F.6209
Outside Diameter ... ...... ... ......... 85 m.m.
Inside Diameter
Width ........... ... ..... ... ...... ... ......... 19 m.m.
Timing Side Main Roller Bearing-
Type ............ ... ..... ... ...... ... ...... S.K.F. N209
Outside Diameter .. ... ...... ... ......... 85 m.m.
Inside Diameter .... ... ...... ... ......... 45 m.m.
Width ........... ... ..... ... ...... ... ......... 19 m.m.
Rocker Inside Diameter ... ...... ... .5627/.5622 in.
Rocker Bearing Inside Diameter .5622/.5617 in.
Rocker Spindle Diameter ...... ... .5617/.5615 in.
Inlet Valve Stem Diameter .... ... .3430/.3425 in.
Exhaust Valve Stem Diameter ... .3410/.3405 in.
Valve Guide Internal Diameter
Valve Guide External Diameter
Valve Guide Hole in Cylinder Head Dia. .625/.626 in.
Tappet Stem Diameter ........... ... .3743/.3740 in.
Tappet Guide Internal Diameter
Tappet Guide External Diameter 1.0125/1.0130 in.
Tappet Guide Hole in Crankcase Dia 1.011/1.010 in.
Tappet Clearance with cold engine:
Inlet .............. ... ..... ... ...... ... ............. Nil
Exhaust ................. ... ....................... Nil
SECTION Ala
Technical Data
"Meteor 700 " Engine
70 m.m.
6.1/2 to 1
.0625/.0635 in.
.1550/.1560 in.
.001/ .003 in.
.7499/.7501 in.
... ...... ... ......... 45 m.m.
.3437/.3447 in.
.6275/.6270 in.
.3755/.3745 in.
Valve Spring Free Length
Inner ............ ... ...... ... ............... 2.1/32 in.
Outer ......................................... 2.3/32 in.
(Renew when reduced by 3/16 in.)
Valve Timing with .012 in. clearance--
Exhaust Opens
Exhaust Closes
Inlet Opens ...
Inlet Closes ...
Camshaft Bearing External Diameter .9095/.9085 in.
Camshaft Bearing Internal Diameter .7505/.7495 in.
(Bored in position in crankcase)
Cam Lift ............ ... ...... ... ..... ...
Valve Lift (approx.)
Timing Sprocket .......... ... ..... ... ...... 12 Teeth
Camshaft Sprocket ...... ... ..... ... ...... 24 Teeth
Magneto Sprocket ........ ... ..... ......... 19 Teeth
Timing Chain-Type
Length
Width
Pitch
Roller
Magneto Chain-Type
Length ........ ... ... 44 pitches
Width ... ..... ... ... 8.64 m.m.
Pitch ... ..... ... ... 8 m.m.
Roller ... ..... ... ... 5 m.m.
Magneto Speed ... ...... ... ..... Half Engine Speed
Points ... ...... ... .....
Timing Advanced
T.D.C.
For Coil Ignition see Section C1.page 2.
Engine Sprocket ........... ... ...... ... ...
Clutch Sprocket ........... ......... ... ...
Final Drive Sprocket (Solo) ... ...... ... 18 Teeth
Final Drive Sprocket (Sidecar)
Primary Chain Type
Length ......... ... ...... ... ...... ... ..
Width .......... ... ...... ... ...... ...
Pitch ............ ... ...... ... ...... ....
Roller .......... ... ...... ... ...... ... ......... .250 in.
Feed Oil Pump-Speed
Piston Diameter
Stroke
Return Oil Pump-Speed
Piston Diameter
Stroke ... ...
Sparking Plug. Type
Diameter
... ... 75° before B.D.C.
... 35° after T.D.C.
... ... 30° before T.D.C.
... ... 60° after B.D.C.
.3125 in.
... ..... ... .3125 in.
Single No. 110038 endless
... ..... ... ... 66 pitches
... ..... ... .225 in.
... ..... ... .375 in.
... ..... ... .250 in.
Duplex No. 114500 endless
.012/.015 in.
3/8 in.-7/16 in. before
32 Teeth
56 Teeth
16 Teeth
Duplex No. 114038 endless
94 pitches
.628 in.
375 in.
.. ....... ... . 1/6 Engine Speed
.25 in. (nominal)
... ... .5 in.
.. 1/6 Engine Speed.
.375 in. (nominal)
.5 in.
...Lodge CS14 K.L.G. F.50
Champion L10
14 m.m.