Section A14B - Royal Enfield 350 BULLET 1956 Workshop Maintenance Manual

ROYAL ENFIELD WORKSHOP MANUAL
Cubic Capacity ... ...
Stroke ... .. ...
Bore ... ... Nominal ..
Actual .. 3.30725/3.30675 in.
(Rebore to .020 in. when wear exceeds .008 in. and again to
.040 in. after a further .008 in. wear.)
Compression Ratio ................................ .. . .. 6.5 to 1
Compression Ratio, 1959 onwards ............. 7.25 to 1
Piston Diameter.
Bottom of Skirt.Fore and Aft ... 3.3047/3.3042 in.
Top Lands
Piston Rings
Width.Plain Rings (Two)
Scraper Ring (One)
Radial Thickness ........................... ..
Clearance in Grooves.Plain Rings
Scraper Ring
(Renew Piston Rings when gap exceeds 1/16 in.)
Oversize Pistons and Rings available... .020 in. and .040 in.
Piston Boss Internal Diameter
Gudgeon Pin Diarreter ............ ... ......... ...
Con. Rod Small End Diameter
Con. Rod Big End Diameter ... ......... ... ..1.62625/ 1.62575 in.
Crank Pin Diameter
Con. Rod Floating Bush.
Outside Diameter ............. ... ......... ... ..1.6235/1.6230 in.
Inside Diameter ................ ... ......... ... .. 1.2502/12498 in.
Width ...................... ... ........ ... ......... ...
Driving Side Main Ball and Roller Bearings
SKF.CRL.8 and SKF.RLS.8.
Outside Diameter .......................... ... .... 2.25 in.
Inside Diameter ................ ... ......... ... ....
Width ...................... ... ........ ... ......... ...
Timing Side Main Roller Bearing..
Outside Diameter ............ ... ......... ... 1 .876/ 1 .875 in.
Inside Diameter ... ........ ... ......... ...1.5002/1 4998 in.
Width ...................... ... ........ ... ......... ...
Size of Rollers.
Nominal Size ........... ...1/4 in. dia. x 21/64 in. long
Diameter ................ ... ........ ... ......... ..
Length ................................ ..
Rocker Bearing Inside Diameter
Rocker Spindle Diameter .................... ...
Rocker Spindle Dia., 1959 onwards
Rocker Bush Diameter, 1959 onward
Inlet Valve Stem Diameter
Exhaust Valve Stem Diameter
Valve Guide Internal Diameter
Valve Guide External Diameter
Guide Hole in Cylinder Head
Tappet Stem Diameter ................ ........ ...
Tappet Guide Internal Diameter

SECTION A14b

Technical Data
" 500 Bullet Engine " 1956 onwards
... ... 499 c.c.
... 90 mm.
84 mm.
... ..... 3.284/3.281 in.
... .063/ .062in.
... .156/.155 in.
.115/.108 in.
.0035/.0015 in.
.0035/.0015 in.
... .7500/.7497 in.
.7500/.7497 in.
.. ... .7507/.7505 in.
... ......... ... .. 1.24900/1.24875 in.
.983/.980 in.
1 in.
.625 in.
.750 in.
.2500/.2490 in.
.328/.327 in.
.626/.625 in.
.6240/.6235 in.
.5617 .5615 in.
.5627/.5622 in.
.3430/.3425 in.
.3410/.3405 in.
.3447/.3437 in.
.6275/.6270 in.
.626/.625 in.
.375/.374 in.
... .3760/.3752 in.
Tappet Guide External Diameter
Guide Hole in Crankcase ..................... ......
Tappet Clearance with cold engine
Inlet ...
Exhaust ................. ............ ... ...........................
Valve Spring Free Length
Inner (Earlier Type)
Outer (Earlier Type)
Inner (1959 onwards)
Outer (1959 onwards)
(Renew when reduced by 3/16 in.)
Valve Timing with 012 in. clearance.
Exhaust Opens ............ ... ......... ... . 75° before B.D.C.
Exhaust Closes ............ ... ......... ...
Inlet Opens ............ ... ......... ... . 40° before T.D.C
Inlet Closes ............ ... ......... ...
Cam Spindle External Diameter
Cam Bush Internal Diameter ............... ..
Cam Lift .................................................... ... ....
Valve Lift (approximately) .................... ... ....
Contact Breaker (Coil Ignition)-
Speed ... ........ ............ ... ......... ... .. 1/2 Engine Speed
Points ... ........ ............ ... ......... ...
Timing ........... ............ ... ......... 5/16 in. before T.D.C.
Magneto
Speed ... ........ ............ ... ......... ... .. 1/2 Engine Speed
Points ... ........ ............ ... ......... ..
Timing ... ........ ............ ... ......... 5/16 in. before T.D.C.
Engine Sprocket ............ ............ ... ......... ... ........... 25 Teeth
Clutch Sprocket ............ ... ........................ 56 Teeth
Final Drive Sprocket.
Solo ........... ... ........ ............ ... ......... ... ........... 21 Teeth
Sidecar .................. ............ ... ......... ... ........... 18 Teeth
Primary Chain..
Type .......... ... ........ ............ ... ......... ... Duplex No. 114038
.................... ........... ............ ............ .............. Endless
Length ... ........ ............ ... ......... ... .......... 90 Pitches
Width ... ........ ............ ... ......... ...
Pitch ... ........ ............ ... ......... ...
Feed Oil Pump
Speed ............................... ............ ... ......... ... 1 /12 Engine Speed
Piston Diameter ............ ... ......... ... .24975/.24950 in.
Stroke .............................. ............ ... ......... ...
Return Oil Pump
Speed ............................... ............ ... ......... ... . 1/12 Engine Speed
Piston Diameter ............ ...
Stroke ................... ............ ... ......... ...
Sparking Plug
Type ........... ... ........ ............ .. ..... Lodge HLN, KLG FE80
Champion NA8 (not 1959) Long Reach
Diameter ... ........ ............ ... .......................... 14 mm.
.7510/.7505 in.
.750/.749 in.
Nil
Nil
... ......... ... ......... 2 .032 in.
... ......... ............ 2.095 in.
... ......... ... ......... 1.5 in.
............ ... ........ 1.11/16 in.
35° after T.D.C.
70° after B.D.C.
... .6240/.6230 in.
.6255/.6250 in.
.3125 in.
.3125 in.
.014/.016 in.
.012/.015 in.
.628 in.
.375 in.
.5 in.
.37475/.37450 in.
.5 in.