TECHNICAL DATA (350cc Bullet)
Cubic Capacity 346cc Aluminium cylinder head:
Stroke 90mm Valve guide external diameter 0.6275/0.6270”
Bore 69.876mm (2.751”) Valve guide hole (in cylinder
(Rebore to 0.020” when wear exceeds 0.065” head) diameter 0.626/0.625”
and again to 0.040” after further 0.065” wear)
Cam follower spindle diameter 0.5005/0.4995
Compression ratio: 7.5 to 1 Cam follower internal diameter 0.5020/0.5010”
Idler pinion spindle diameter 0.05005/0.4995”
Big end internal bore of bush 1.62625/1.62575” Idler pinion internal diameter 0.5025/0.5015”
Big end floating bush o/d 1.6235/1.6230”
I/d 1.2502/1.2498” Contact breaker and oil pump
Crankpin 1.249/1.24875” spindle diameter 0.4370/0.4365”
Contact breaker and oil pump
Outrigger bearing bearing diameter
Bearing journal 1.8105/1.8100” (after reaming) 0.4377/0.4375”
Plain bearing bush 1.8132/1.8125”
Piston Diameter Valve clearance with cold engine:
Bottom of skirt (fore and aft) 2.7485/2.7475” Alloy head
2
nd
and 3
rd
lands 2.729/2.726” Inlet zero
Top land 2.725/2.722” Exhaust 0.002”
Piston Rings
Width, Plain rings 0.0635/0.0625”
Scraper ring 0.156/0.155” Valve spring free length:
Radial thickness 0.1215/0.1135” Inner (with alloy top collars) 1.
1
/
2
”
Gap when in unworn cylinder 0.011/0.015” Outer (with alloy top collars) 1.
11
/
16
”
(Renew piston rings when gap exceeds
1
/
16
”) Renew when reduced by
1
/
8
”
Clearance in grooves
Compression ring 0.005/0.003” Valve timing with 0.015” clearance
Scraper ring 0.004/0.002”
Piston boss internal diameter 0.7501/0.7499” Exhaust opens 57 degrees before B.D.C.
Gudgeon pin diameter 0.750/0.7498” Exhaust closes 31 degrees after T.D.C
Con rod small end diameter 0.7507/0.7505” Inlet opens 27 degrees before T.D.C.
Inlet closes 55 degrees after B.D.C.
Rocker bearing inner diameter,new 0.6880/0.6875”
Rocker spindle diameter, new 0.6871/0.6868”
Camshaft bush external diameter 0.562/0.561”
Inlet valve stem diameter 0.3430/0.3425” Camshaft bush internal diameter 0.5627/0.5625”
Exhaust valve stem diameter 0.3410/0.3405” (After reaming)
Valve guide internal diameter Timing sprocket 14 teeth
(After reaming) 0.3447/0.3437” Camshaft sprocket 28 teeth
Engine sprocket 23 teeth
Clutch sprocket 49 teeth
Final drive sprocket (std) 19 teeth
Oil pump:
Contact breaker points gap 0.015” Feed plunger diameter 0.12475/0.12450”
Ignition timing, advanced
5
/
16
”-
3
/
8
” before T.D.C. Return plunger diameter 0.31225/0.31200”
Speed ½ engine speed
Spark plug: Champion L7 or L10S stroke 0.375”
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