Tech Stuff

 STANDARD SPEC's

FRAME, ENGINE MOUNTINGS AND REAR SUSPENSION UNITS

Steering Head Bearing Type: Double Sealed Ball (2 off single row sealed ball) 6205-2RS, Measures 25 x 52 x 15mm 

Front Engine mounting:
Spacer Length: 2.573 - 2.553 in. (65.3 - 64.8 mm)
Bonded Bush Thickness: 5/8 in. tappering to 0.510 in. (15.87 mm tappering to 12.95 mm)
Bonded Bush Quanity: 2
Buffer Thickness: 1/2 in. (12.70 mm)
Outside Buffer Diameter: 1-11/16 in. (42.08 mm)
Buffer Quanity: 2
Bolt Size: 7.13 in. 1/2 in. X 20 UNF
Ideal Free Play: 0.010 in. (.254 mm)
Shim Thickness Available: .005 in, .010 in., .020 in., .030 in. (.127, .254, .508, .762 mm)

 

Rear Engine Mounting:
Spacer Length: 1.560 - 1.550 in. (39.6 -39.37 mm)
Bonded Bush Thickness: 1/2 in. tappering to 0.410 in. (12.70 mm tappering to 10.40 mm)
Bonded Bush Quanity: 3
Buffer Thickness: 1/2 in. (12.70 mm)
Outside Buffer Diameter: 1-5/16 in. (33.3 mm)
Buffer Quanity: 2
Stud Thread Size: 1/2 in. X 20 UNF 2A
Stud Length: 13.00 in. (330.2 mm)
Ideal Free Play: 0.010 in. (.254 mm)
Shim Thickness Available: .005 in, .010 in., .020 in., .030 in. (.127, .254, .508, .762 mm)
Bolt Torque Setting: 300 in./lb. (3.456kg./mtr.)

Rear Suspension Units:
Type -- Girling : Spring/Oil Damped
Total Length 13 Inches Between Centres.
Spring Fitted Length: 8.4 in. (213.36 mm)
Spring Colour Code: Red/Yellow/Red (Chrome Spring)
Spring Rate: 126 lb. per inch
Spring Free Length: 8.75 in. (222.25 mm)

SPEEDOMETER GEARING:

Using Dunlop 4.10 in. X 19 in. Rear Tyre
Rolling Radius: 12.57 in. (319.3 mm)
Revs./Mile: 806
Gearbox Ratio: 15/12 1: 1.25

WHEELS AND BRAKES:

Front Wheel:
Rim Size: WM2 --19
Spokes -- Drum Brake Wheel:

Inside LH -- 90º head. 8 SWG swaged, .375 in. (9.5 mm) head
Outside -- 90º head. 8 SWG swaged, .531 in. (13.45 mm) head
Spokes -- Disc Brake Wheel:

Inner LH -- 90º head. 9 SWG .270 (6.9 mm) head
Outer LH -- 90º head. 9 SWG .270 (6.9 mm) head (80ºbend)
Right Hand -- 90º head. 8SWG .290 (7.35 mm) head

Wheel Bearing L.H.: 17 mm X 40 mm X 12 mm
Wheel Bearing R.H.: NM 17721 (17mm X 40mm X 16mm)
Bearing Housing I.D.: 1.5732 in./1.5740 in. (39.96mm / 39.98 mm)
Spindle (bearing / dia.) : 0.6671 / 0.6670 in. (16.945 / 16.942 mm)
Tyre Size: 4.10 X 19"
Tyre Pressure: 26 lb./psi (1.83 kg/sq. cm.)
Tyre Diameter: (Dunlop) : 26.46 in. (672 mm)
Sectional Width (Dunlop) : 4 in. (101.6 mm)

 

Front Brake (Drum):
Type: Internal Expanding Two Leading Shoe
Drum Dia. : 8 in. (203.2 mm)
Lining Area -- Total 2 Shoes : 18.69 sq. in. / 474.776 sq. mms

 

Front Brake (Disc):
Type: Disc -- Hydraulically Operated
Pad Type: Steel Backed, Moulded and Bonded Friction Material
Pad Friction Area Dia. : 1.65 in. (41.9 mm)
Pad New Thickness (Pad and Backing Together) : .38/.37 in. (9.652 / 9.398 mm)
Pad Minimum Thickness: 10.70 in. (271.7 mm)
Disc Width at Friction Area: 0.260 / 0.250 in. (6.604 / 6.35 mm)
Brake Fluid Type: Lockheed Series 329 Hydraulic Fluid for Disc Brakes.
( Complies with U.S. Safety Standards 116)

 

Rear Wheel:
Rim Size: WM2 -- 19
Spokes: Rear Outer: 6.093 in. long: 8/10 SWG : 90º head : offset length .531 in. (13.45 mm)
Rear Inner: 6.093 in. long: 8/10 SWG : 90º head : offset length .375 in. (9.5 mm)
Wheel Bearings 1971 on: Ball Journal 17 mm X 40 mm X 12 mm
Sprocket Bearing: NM. 17721 : post 1971 (17mm X 40mm X 16mm)
Hub Bearing Housing I.D.: 1.5732 / 1.5740 in. (39.95 mm / 39.97 mm)
Tyre Size: 4.10 X 19 in. (104.14 X 482.60)
Tyre Pressure: 26 lb./psi (1.83 kg/sq. cm.)
Tyre Diameter: (Dunlop) : 26.46 in. (672 mm)
Sectional Width (Dunlop) : 4 in. (101.6 mm)

Rear Brake:
Internal Drum Dia.: 7.007 / 6.997 in. (177.8mm)
Lining Area -- Total 2 Shoes: 13.6 sq. in./345.44 sq. mm.

Front Forks:
Type: Telescopic, hydraulically damped, internal springs.
Main Tube O.D.: 1.3589 / 1.3574 in. (34.518 / 34.440 mm)
Top Bush Fitted I.D.: 1.3595 / 1.3604 in. (34.531 / 34.556 mm)
Bottom Bush O.D.: 1.4979 / 1.4990 in. (38.049 / 38.075 mm)
Fork Slider I.D.: 1.4995 / 1.5010 in. (38.087 / 38.125 mm )
Spring -- No. of Coils.: 75½ approx.
Free Length: 18.687 in. (474.65 mm)
Rate: 36.5 lb./in. (6.52 kg./cm) Red paint marked

Steering Crown Lug and Stem:
Stem Diam. at Bearing Areas: .9839 / .9835 in. (24.993 / 24.983 mm)
Pre 1971- Head Race Adjuster Nut Size: 1.3125 / 1.3005 in. across flats (33.33 / 33.03 mm)
Fork Tube Top Nut Hexagon Size: 1.3125 / 1.3005 in. (33.33 / 33.03 mm)
Head Bearing Spacer Length: 5.06 in. (128.524 mm)
Fork Leg Capacity: 150 cc (5 fl. oz. ) each leg
Total Fork Movement: 6 in. (15.24 cm)

ELECTRICAL:

System Voltage: 12 volt -- Positive earth
Alternator Type: RM 21
Rectifier Type: 2 DS 506
Zener Diode Type: Z D 715
Battery Type: Norton Villers 063244; Yuasa 12N9-4B; PUZ5A Lucas
Battery Rating: 10 AH @ 10 hour rate
Coil Type: 17M6
Ballast Resistor Type: 3BR
Contact Breaker Type: 6CA (10CA on later models)
Warning Light Assimilator Type: 3 AW
Fuse Rating: 35 amp (17½ amp continuous rated)
Indicator Flasher Unit Type: 8 FL

 

Bulbs:
Headlight: Type 370 -- 12 volt -- 45/40 watt
Tail light/Stop light: Type 370 -- 12 volt -- 21/6 watt, transverse offset pin
Parking light: Type 989 -- 12 volt -- 6 watt, coil miniature bayonet cap
Indicator light: Type 281 -- 12 volt -- 2.0 watt, coil, sub-miniature

ENGINE:

 

Crankshaft:
Material: EN16
Big End Journal Diameter: 1.7509 / 1.7504 in. (44.472 / 44.460 mm)
Crankcheek Bolts: EN 16 S
Balance Factor: 52% Dry
Permissible End Float: 0.005--0.015 in. (.1270--.3810 mm)

Main Bearings:	Pre 1972		1972 Onward
Drive Side:	Single Lipped Roller		Special Roller (Single Lipped)
Timing Side:	Single Row Ball		Special Roller (Single Lipped)
	All 30 mm X 72 mm X 19 mm

 

Connecting Rods:
Material: Aluminum Alloy BS.L83 or 2L65 or L77
Length Between Centres: 5.877 / 5.873 in. (129.276 /129.274 mm)
Big End I.D.:(less shell cap bolted on) 1.8950 / 1.8955 in. (48.133 / 48.145mm)
Width at Big End Eye: 1.010 / 1.008 in. (25.65 / 25.60 mm)
Rod Side Clearance: .013 -- .016 (.330 / .406 mm
Rod End Clearance: Less than .001 (.0254 mm)

 

Pistons:
Material: BS.1490 -- LM.. 13WP
Wrist Pin Boss I.D.: .6869 / .6867 in. (17.447 / 17.442 mm)
Diameter -- Bottom of Skirt:2.8713 / 2.8703 in. (72.921 / 72.906 mm) (750) std. bore

3.028 / 3.0271 in. (76.911 / 76.888 mm) (850) std. bore

 

Pistons Rings:
Type: Top Chrome Compression. Second Compression
Taper. "S.E." oil control. Earlier Models
Top Ring Fitted Gap: .010 -- .012 in. (.254 / .305 mm)
Middle Ring (Taper) Fitted Gap: .008 / .012 in. (.203 / .305 mm)

 

Wrist Pins: (Gudgeon Pins)
Length: 2.438 / 2.423 in. (61.925 mm / 61.544 mm) 750
2.559 / 2.544 in. (65 mm / 64.619 mm) 850
Diameter: 0.6869 / 0.6867 in. (17.447 mm / 17.442 mm)

 

Cylinder Block:
Material: Cast Iron

Finished Size:	Grade A: 2.8746 / 2.8750 in.	}750	3.0315 / 3.0320 in.	}850
	Grade B: 2.8750 / 2.8754 in.		3.0320 / 3.0325 in.

Cylinder Head:

Cylinder Head:	Standard	Combat
Material:	RR 53 B	RR 53 B
Valve Seat Angle:	45º	45º
Inlet Port Nominal Dia.:	1 1/8 in. (28.573 mm)	1 1/8 - 1¼ in. (28.575 - 31.75 mm)
Ex. port Nominal Dia.:	1¼ in. (31.76 mm)	1 ¼ in. (31.76 mm)
Ex. ring Thread Size.:	1.997 in. X 14 T.P.I.	1.997 in. X 14 T.P.I.
	(50.93 mm)	(50.93 mm)

Camshaft:

Camshaft:	Standard	Combat
Material:	EN 32 B	EN 32 B
Maximum Lift - inlet:	0.332 in.(8.432 mm)	0.309 in.(9.906 mm)
exhaust:	0.322 in. (8.178 mm)	0.346 in. (8.788 mm)
Base Circle Dia.:	0.855 in. (22.479 mm)	0.906 in. (23.012 mm)
Bearing Journal Dia.:	0.8735 in. (22.187 mm)	0.8735 in. (22.187 mm)

 

Camshaft Bushes:

Camshaft Bushes:	Pre 1972	1972 Onwards
Fitted I.D. (Left Bush):	.8750 in. (22.225 mm)	.8750 in (22.225 mm)
Fitted I.D. (Right Bush):	.8750 in. (22.225 mm)	.8750 in. (22.225 mm)

Tappets:
Material: Cast Iron Grade 14 - Stellite Tipped

 

Push Rods:
Material: Heat Treated Dural Tube "B" or "S"
Inlet -- Assembled Length: 8.166 / 8.130 in. (207.416 / 206.466 mm)
Exhaust -- Assembled Length: 7.321 / 7.285 in. (186.053 / 185.039 mm)

 

Rockers:
Material: EN33
Rocker Ratio -- Inlet: 1.13 : 1
Rocker Ratio -- Exhaust: 1.13 : 1
Bore Diameter: 0.4998 / 0.5003 in. (12.694 / 12.708 mm)
Adjuster Thread Size: 9.39 mm X 26 TPI. Whit Form

 

Rocker Shaft:
Diameter: .4988 / .4985 in. (12.669 / 12.661 mm)

Valve (tappet) Clearances (engine cold):
Inlet : .006 in. (0.15 mm) (Commando 750 - 850) ; .008 in. (0.2mm) (Combat)
Exhaust: .008 in. (0.2 mm) (Commando 750 - 850) ; .0010 in. (0.25 mm) (Combat)

 

Valve Lift:

Valve Lift:	Standard	Combat
	Inlet: 375 in. (9.525 mm)	Inlet: .441 in. (11.21 mm)
	Exhaust: .375 in. (9.525 mm)	Exhaust: .391 in. (9.931 mm)

 

Valve Duration:

Valve Duration: (excluding ramps)	Standard	Combat
	152º	164º

Valves:
Material: Inlet -- EN52 -- Chrome Plated Stem
Exhaust -- KE965 -- Chrome Plated stem
Inlet -- Head Dia. : 1.490 in. (37.846 mm)
Stem Dia. (plated area): 0.3115 / 0.3105 in. (7.912 / 7.886 mm)
Exhaust -- Head Dia. : 1.302 in. (33.0708 mm)
Stem Dia. (plated area): 0.3115 / 0.3105 in. (7.912 / 7.886 mm)

 

Valve Guides:
Inside Dia. : 0.3145 / 0.3135 in. (7.988 / 7.962 mm)
Outside Dia. : 0.515 / 0.50 in. (12.738 / 12.725) 750
0.6265 / 0.6260 in. (15.913 / 15.900 mm) 850
Heat Resisting Washer Material: Tuffnol grade ASP
Heat Resisting Washer Thickness: 0.0662 in. (1.574 mm)

 

Valve Springs:

Valve Springs:	Std Inlet	Combat Inlet	Exhaust
Inner -- Free Length: 1.482 in. (37.642 mm)	1.197 in.	1.259 in.	1.222 in.
Fitted length	(30.40 mm)	(31.98 mm)	(31.04 mm)
Outer -- Free Length: 1.618 in. (41.097 mm)	1.259 in.	1.321 in.	1.284 in.
Fitted length	(31.98 mm)	(33.55 mm)	(32.61 mm)

Valve Timing:

Valve Timing: (measured at .013 in. (.3302 mm) cam lift	Standard 750 and 850	Combat
Inlet opens BTDC	50º	59º
Inlet closes ABDC	74º	89º
Exhaust opens BBDC	82º	88º
Exhaust closes ATDC	42º	60º

 

Intermediate Timing Gear:
Bush Material: Phosphor Bronze
Bush Finished Dia. : 0.5627 / 0.5610 in. (14.292 / 14.274 mm)

 

Intermediate Gear Shaft Dia. : 0.5615 / 0.5610 in. (14.262 / 14.249 mm)

 

Camshaft Chain:
Size: .375 in. X .225 Single Row (Endless)
Nº of chain links: 38
Ideal Adjustment : 3/16 in. (4.8 mm) up and down on top run of chain

 

Ignition Timing:
Fully Advanced position: 28º BTDC

 

Contact Breaker:
Points Gap: .014 / .016 in. (.35 / .4 mm)
Centre Bolt Thread Size: ¼ in. X 26 T.P.I

 

Spark Plug:
Type: Champion N7Y (was N6Y)
Gap: .023 / .028 in. (.59 / .72 mm)

 

Carburetor Standard Commando 750

Type: Twin Concentric Float AMAL 930 30 mm

Main Jet	1970	1971	1972
	220 with early megaphone mufflers 180 with restricted megaphone 210 with modified megaphone	220	220 (210 with mute fitted)
Needle Jet	.107	.106	.106
Needle Position	Middle	Middle	Middle (Top with mute)
Throttle Valve	3	3	3

 

 

 

Carburetor -- Combat:
Type: Twin Concentric Float AMAL 932 32 mm
Main Jet: 230 (220 with mute)
Needle Jet: .106
Needle Position: Middle (Top with mute)
Throttle Valve: 3

 

Carburetor -- 850:
Type: Twin Concentric Float AMAL 932 32 mm
Main Jet: 260
Needle Jet: .106
Needle Position: Top
Throttle Valve: 3½
Needle: 928/104
Choke (spray) Tube: 928/107

 

Air Filter:
Element Type: Pleated Design Impregnated Paper

TORQUE SETTING:

Cylinder head nuts & bolts : (3/8 in.): 360 in./lb. 30 ft./lb. 4.15 kg./m.
Cylinder head bolts: (5/16 in.) 240 in./lb. 20 ft./lb. 2.75 kg./m.
Cylinder base nuts: (3/8 in.) 300 in./lb. 25 ft./lb. 3.45 kg./m.
Cylinder base nuts: (5/16 in.) 240 in./lb. 20 ft./lb. 2.75 kg./m.
Cylinder through bolt: (850 cc) 360 in./lb. 30 ft./lb. 4.15 kg./m.
Connecting rod nuts: 300 in./lb. 25 ft./lb. 3.45 kg./m.
Rocker spindle cover plate bolt: 100 in./lb. 8 ft./lb. 1.11 kg./m.
Crankshaft nuts: 300 in./lb. 25 ft./lb. 3.45 kg./m.
Cam chain tensioner nuts: 180 in./lb. 15 ft./lb. 2.07 kg./m.
Oil pump stud nuts: 180 in./lb. 15 ft./lb. 2.07 kg./m.
Rocker feed banjo bolts: 180 in./lb. 15 ft./lb. 2.07 kg./m.
Engine mount bolts: 300 in./lb. 25 ft./lb. 3.45 kg./m.
Rotor nut: 960 in./lb. 80 ft./lb. 11.06 kg./m. Alternator stud nuts: 180 in./lb. 15 ft./lb. 2.07 kg./m.
Clutch-to-mainshaft nut: 840 in./lb. 70 ft./lb. 9.68 kg./m.
Mainshaft nut: 480 in./lb. 45 ft./lb. 5.50 kg./m.
Countershaft sprocket nut: 960 in./lb. 80 ft./lb. 11.06 kg./m.
Gearbox inner cover nuts: 144 in./lb. 12 ft./lb. 1.66 kg./m.
Top gearbox fixing bolts: 660 in./lb. 55 ft./lb. 7.60 kg./m.
Rear suspension unit nuts: 360 in./lb. 30 ft./lb. 4.15 kg./m.
Main isolastic unit bolts: 300 in./lb. 25 ft./lb. 3.45 kg./m.
Fork tube top (chrome) nuts: 360 in./lb. 30 ft./lb. 4.15 kg./m.
Fork tube lower yoke pinch bolts: 360 in./lb. 30 ft./lb. 4.15 kg./m.
Steering head main nut (1971 - later): 360 in./lb. 30 ft./lb. 4.15 kg./m.
Disc brake caliper-to-fork leg bolts: 360 in./lb. 30 ft./lb. 4.15 kg./m.
Disc brake caliper end plug: 312 in./lb. 26 ft./lb. 3.60 kg./m.
Disc-to-hub nuts: 240 in./lb. 20 ft./lb. 2.75 kg./m.
Drum brake cam fixing nuts: 360 in./lb. 30 ft./lb. 4.15 kg./m.
Sidestand nut (1972 - later): 600 in./lb. 50 ft./lb. 6.91 kg./m.
Zener diode nut: 24 in./lb. 2 ft./lb. 0.28 kg./m.
Coil mounting bracket nuts: 10 in./lb. 1 ft./lb. 0.14 kg./m.
Oil - pressure release valve: 300 in./lb. 25 ft./lb. 3.45 kg./m.

GEARBOX:

Ball Journal Bearings:
Mainshaft (clutch end) : Ball Journal 1¼ in. X 2½ in. X 5/8 in.
Mainshaft (k/start end): Ball Journal 5/8 in. X 1-9/16 in. X 7/16 in.
Layshaft (clutch end ) : Ball Journal 17 mm X 40 mm X 12 mm.

Reductions:

4th (High) : 1: 1
3rd: 1.21 : 1
2nd: 1.70 : 1
1st (Low) : 2.56 : 1

 

Theoretical road speeds using various countershaft (gearbox) sprockets
Table assumes standard sprockets: Engine 26 T
Clutch 57 T
Rear 42 T

Sprocket Teeth		19	20	21	22	23
Overall Gear Ratio		4.84	4.60	4.38	4.18	3.99
Engine RPM	6000	92	97	102	106	112
	6500	99	105	110	115	121
	7000	107	113	119	124	130

 

Overall Ratios	19T GEARBOX	21T GEARBOX	22T GEARBOX
4th (High)	4.84 : 1	4.38 : 1	4.18 : 1
3rd	5.90 : 1	5.30 : 1	5.10 : 1
2nd	8.25 : 1	7.45 : 1	6.84 : 1
1st (Low)	12.40 : 1	11.20 : 1	10.71 : 1

 

Nº. of Teeth on Pinions:
Layshaft: 4th......14t
Layshaft: 3rd......20t
Layshaft: 2nd.....24t
Layshaft: 1st......28t
Mainshaft: 4th......23t
Mainshaft: 3rd......21t
Mainshaft: 2nd.....18t
Mainshaft: 1st.......14t

 

Gearbox:
High Gear Bush O.D.: 0.9060 / 0.9053 in. (23.012 / 22.995 mm)
High Gear Bush I.D.: 0.8145 / 0.8140 in. (20.688 / 20.675 mm)
High Gear Bush Fitted I.D.: 0.8133 / 0.8120 in. (20.657 / 20.625 mm)
Kickstart Spindle Bush Fitted I.D.: 1.126 / 1.124 in. (28.60 / 28.549 mm)
Mainshaft 2nd Gear Bush Fitted I.D.: 0.8125 / 0.8115 in. (20.637 / 20.612 mm)
Layshaft 3rd Gear Bush Fitted I.D.: 0.8125 / 0.81 in. (20.637 / 20.574 mm)
Layshaft 1st Gear Bush Fitted I.D.: 0.6885 / 0.6875 in. (17.488 / 17.462 mm)
Footchange Spindle Bush, Kickstart Case Fitted I.D.: 0.6290 / 0.6285 in. (15.976 / 15.964 mm)
Camplate/Quadrant Bush Fitted I.D.: 0.5005 / 0.4995 in. (12.713 / 12.687 mm)
Layshaft Bush I.D.: 0.675 / 0.673 in. (17.145 / 17.094 mm)

Gearbox Sprocket: 19T or 21T Standard (Alternative sprockets available -- see table above)

 

Camplate Plunger Spring:
Free Length: 1.500 in. (38.1 mm)
Spring Rate: 21 lbs./in. (3.74 kgs./m)

Selector Spindle Diameter: 0.3740 / 0.3735 in. (9.499 / 9.486 mm)
Selector Fork Bore: 0.3755 / 0.3745 in. (8.537 / 9.525 mm)

 

Primary Transmission and Rear Chain:

Engine Sprocket Nº. of Teeth: 26
Primary Chain Details: 92 Pitches: .375 in. X .250 in. Triple Row
Rear Chain Details: 99 Pitches: 0.400 in. X 0.380 in. Simple Type

Clutch Chainwheel Nº. of Teeth: 57
Clutch Pushrod -- Length: 9.813 / 9.803 in. (244.250 / 243.996 mm)
Clutch Pushrod -- Dia.: 0.237 / 0.232 in. (6.019 / 5.892 mm)
Clutch Operating Ball Dia.: ½ in. (12.70 mm)
Clutch Operating Body Lock Ring Thread Size: 41.4 mm X 20TPI
Clutch Type: Multi plate, Diaphragm Spring.
Clutch Friction Plate Nº. off: 4 -- Fibre Clutch; 5 -- Metal Clutch
Clutch Friction Plate Thickness: .148 / .142 in. (3.759 / 3.607 mm)
Clutch Friction Plate Material: DON 112, Fibre Clutch -- Sintered Bronze, Metal Clutch
Clutch Centre Bearing Specification: Deep Groove Ball -- One Dot
OD 62 mm, ID 35 mm, Width 14 mm
Corner Rad. 1.5 mm
Clutch Adjuster Dia. and Thread: ½ in. X 20 UNF 2A
Clutch Adjuster Length: 0.904 in. X 0.894 in. (22.962 / 22.708 mm)

CAPACITIES:

Fastback Fuel Tank Capacity: 3¼ Imp. Galls (15 Litres)
L.R. Fastback Fuel Tank Capacity: 4 Imp. Galls (18 Litres)
Roadster Fuel Tank Capacity: GRP 2¼ Imp. Galls (10 Litres) : Steel 2½ Imp. Galls (11 Litres)
S.S. Hi-Rider Fuel Tank Capacity: 2 Imp. Galls (9 Litres)
Interstate Fuel Tank Capacity: GRP 5¼ Imp. Galls (24 Litres) : Steel 5½ Imp. Galls (25 Litres)
Interpol Fuel Tank Capacity: No Radio/2-way: 4 Imp. Galls (18 Litres)
Radio/2-way Insert: 3½ Imp. Galls (16 Litres)
Oil Tank: 5 Imp./6 U.S. pints, 2.8 Litres
Gearbox: 0.75 Imp./0.9 U.S. pints, 0.42 Litres
Front Forks: 150 cc (5 fl. oz.) Each Leg
Primary Chaincase: 200 cc (7 fl. oz.)

MISCELLANEOUS DATA:

Height : Fastback etc. -- 40.75 in. (103.5 cm)
Hi-Rider only -- 50¼ in. (127.3 cm)
Length : 87.5 in. (222 cm)
Wheelbase : 56.75 in. (144 cm)

Total Weight (with oil & 1 gal. fuel) :
Roadster 422 lbs. (191.440 kgs) (Dry) : 395.4 lbs. (179.3 kgs)
Interstate 436 lbs. (197.749 kgs) (Dry) : 410 lbs. (186.1 kgs)

 

Weight on Front Tyre (dry) : 179.7 lbs. (84.37 kgs) Weights for Roadster and Interstate Model Similar.

Weight on Rear Tyre (dry) : 215.7 lbs. (97.5 kgs)

(Assumes Motorcycle equipped with 4.10 in. X 19 in. Tyres Front & Rear)

Ground Clearance : 6 in. (15 cm)

Width : 26 in. (66cm)

Front Brake Drum Diameter : 7.95 in. (20.32 cm)

Rear Brake Drum Diameter : 7 in. (17.78 cm)

Total Braking Area (Front) : 18.69 sq./in. (120 sq./cm.)

Total Braking Area (Rear) : 13.60 sq./in. (88 sq./cm.) Drum Brake.

Overall Length of Exhaust System (from flange at exhaust port end of pipe to tip of muffler) : 60 in. (152.4 cm)

Exhaust System Maximum Diameter : 3.5 in. (8.92 cm)

 

Maximum Theoretical Road Speed : 112.6 MPH (181.111 KPH) Standard 750 Engine
122 MPH (196.336 KPH) Standard 850 Engine

 

Road Speed @ 1000 r.p.m. in Gears (19t Sprocket)
Bottom : 6.28 mph (10.106 kph)

Second : 9.46 mph (15.220 kph)

Third : 13.18 mph (21.211 kph)

Top : 16.09 mph (25.894 kph)

 

Total Movement of Front Forks : 6 in. (15 cm)

Turning Circle (full circle) : 17 ft. 10 in. (518.16 cm)

Gross Vehicle Rating : 859 lbs. (389.6 kgs)

Centre of Gravity : 19¾ in. (501.65 mm) above ground unladed

Seat Height (nominal) : 33 -- 34 in. (838.2 -- 863.6 mm) Dependant on Model

SPECIAL WORKSHOP TOOLS: (PART NUMBERS)

060941 Engine Sprocket (clutch hub & cam sprocket) puller
060949 Auto advance unit lock washer (for static timing)
060999 Clutch diaphragm spring tool
061015 Clutch lock tool (locks clutch body with plates removed)
064298 Rocker spindle & auto advance slide hammer
ET2003 Crankshaft timing pinion extractor
063964 Valve guide screw type extractor & inserter
063965 Peg spanner (wrench) for wheel bearings & disc caliper
064292 Contact breaker seal & crankshaft-to-timing cover seal drift set
063968 Exhaust lockring "C" spanner
063968 Valve seat cutting tool complete
063970 Roller bearing race extractor
063971 Front isolastic bush insertion tool complete
060942 Steering head adjustment spanner (Pre 1971)
061359 Contact breaker oil seal guide
NM12093 7/8 in. box spanner
064622 Strap wrench