Section A13 - Royal Enfield METEOR MINOR STANDARD 1958 Workshop Maintenance Manual

Cubic Capacity ... ...... ... ...... ... ......... 496 c.c.
Stroke ................. ... ................. .. ....... 64.5 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.
Top Lands
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 Dia. (
1958/59
Big End Internal Dia. (
late 1959 on
Crank Pin Diameter (
1958/59
Crank Pin Diameter (
late 1959 on
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:
Standard, deluxe and sports under normal running
Inlet
Exhaust
Sports models, continuous high speed running
Inlet
Exhaust
Valve Spring Free Length
Inner 2.1/32 in. (early)
Outer 2.3/32 in. (early) 1.11/16 in. (late)
(Renew when reduced by 3/16 in. early models
or 3/32 in. late models)

SECTION A13

Technical Data
Meteor Minor Engine
70 m.m.
8 to 1
69.811 m.m.
69.40/69.35 m.m.
.0625/.0635 in.
.1550/.1560 in.
.001/ .003 in.
.7499/.7501 in.
) ..... 1.8760/1.8755 in.
) 2.0215/2.0210 in.
) 1.7715/1.7710in.
) 1.8750/1.8745in.
... ...... ... ......... 45 m.m.
.3437/.3447 in.
.6275/.6270 in.
.3755/.3745 in.
Nil
Nil
Nil
.005 in.
1.1/2 in. (late)
Valve Timing with .012 in. clearance-
Standard and de-luxe models:
Exhaust Opens
Exhaust Closes
Inlet Opens ...
Inlet Closes ...
Sports models:
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)
Inlet cam Lift (All models)
Inlet valve Lift (All models)
Exhaust cam Lift (Standard + de-luxe)
Exhaust valve Lift (Standard + de-luxe) .3125 in.
Exhaust cam Lift (Sports models)
Exhaust valve Lift (Sports models)
Timing Sprocket .......... ... ..... ... ...... 12 Teeth
Camshaft Sprocket ...... ... ..... ... ...... 24 Teeth
Distributor Sprocket .... ... ..... ......... 15 Teeth
Timing Chain-Type
Length
Width
Pitch
Roller
Distributor chain-Type Single No. 110500 endless
Length ........ ... ... 40 pitches
Width ... ..... ... ... 8.64 m.m.
Pitch ... ..... ... ... 8 m.m.
Roller ... ..... ... ... 5 m.m.
Distributor Speed ... ...... ... ..... Half Engine Speed
Points ... ...... ... .....
Timing Advanced 3/8 in.-7/16 in. before T.D.C.
Timing Retarded
Engine Sprocket
Clutch Sprocket ........... ......... ... ...
Final Drive Sprocket (Solo) ... ...... ... 19 Teeth
Primary Chain Type Duplex No. 114038 endless
Length
Width .......... ... ...... ... ...... ...
Pitch ............ ... ...... ... ...... ....
Roller .......... ... ...... ... ...... ... ......... .250 in.
Feed Oil Pump-Speed
Piston Diameter .24975/.24950 in.
Stroke ... ...
Return Oil Pump-Speed
Piston Diameter
Stroke ... ...
Spark Plug: Up to engine No. SMCA 7027
(short reach) Champion L10S
Frome engine No. SMCA 7028
(long reach) Champion NA8
... ... 75° before B.D.C.
... 35° after T.D.C.
... ... 30° before T.D.C.
... ... 60° after B.D.C.
... ... 83° before B.D.C.
... 35° after T.D.C.
... ... 30° before T.D.C.
... ... 60° after B.D.C.
.3125 in.
.3125 in.
.3125 in.
.328 in.
.328 in.
Single No. 110038 endless
... ..... ... ... 66 pitches
... ..... ... .225 in.
... ..... ... .375 in.
... ..... ... .250 in.
.015 in.
1/32 in. before T.D.C.
29 Teeth
56 Teeth
92 pitches
.628 in.
.375 in.
.. ....... ... . 1/6 Engine Speed
.5 in.
.. 1/6 Engine Speed.
.375.3755 in.
.5 in.