Technical Specifications - Royal Enfield Bullet Workshop Manual

TECHNICAL SPECIFICATIONS
-
BULLET
-
350 CC
Engine
Single Cylinder
4
Stroke
with Overhead Valve
Cubic Capacity : 3 4 6 c c
Stroke : 9Omrn.
Bore-Nominal : :70rnm
Actual : 69.875 mm/2.751 in.
Compression Ratio : 7.25 : 1
compression Pressure : 110
+
5 PSI (recommended)
Engine outpl
l
t :
18 BHP
/
5625 RPM
Torque
:
2.74kgm/2875RPM
Piston and piston
rfngs:
Ring
dearan
ce
in
grooves : Dimensions for new
components]
Plaln (2) : .001/.003"
Scraper : .002/.004"
Ring
end gap
in
bore
:
.015/.020
Maximum rir-g gap permissible : 0.030"
Gudgeon pin diameter : .7498/.7500'!
Crank pln diameter
:
1.24875/ 1.249"
Connecthg rod small end diameter
:
.7505/.7507"
crankshaft:
Driving side Ball bearLng
: 25
X
62
X
17
mm
(63051
Roller bearing : 2 5 x 6 2 ~ 17
mm
(NU 305 orN 305)
Timing side Roller bearing
: 2 5 x 5 2 ~ 15mm(NU205orN205R)
CamW : .3125
in.
Valve lift : .3125in.
Valve
tizuing
with -012" clearance
Exhaust opens : 75" BTL)C
Exhaust closes : 35"ATDC
Inlet opens : 30" BTDC
Inlet closes : 60" ATDC
Rocker bearing inside diameter : .625/.626" (J3irnensions for new Components]
Rocker spindle diameter : .6235/.624"
Inlet valve stem diameter : .3425/.3430
Exhaust valve stem diameter
:
.3405/.3410
Vdve guide internd diameter
:
.3437/.3447'
Valve guide external diameter : .6270/.6275
Tappet.guide internal diameter : .3752/.3760n
Tappet guide external diameter : .7505/.7510n
~ r i c a t i o n : Dry sump,
OU: t a n k
integral with crank case
Clutch : Wet multiplate,OiI immersed
Engine sprocket : 25 teeth
Clutch Sprocket : 56 teeth
Primary
drive chain
:
3/8" pitch Duplex chain.