1976/1977 KZ900 ALL MODELS (Most Specs Also Apply to 1973-1975 Z1 As Well but Can't Confirm

1976/1977 KZ900 ALL MODELS (Most specs also apply to 1973-1975 Z1 as well but can't confirm all of them to be accurate)

Specifications

Dimensions

Overall LengthUS86.6 in. 2,200 mm

Euro88.4 in. 2,245 mm

Overall width34.1 in. 865 mm

Overall heigth46.1 in. 1,170 mm

Wheelbase58.7 in. 1,490 mm

Road clearance6.5 in. 165 mm

Dry weight US514 lb. 233 kg

Euro532 lb. 241 kg

Fuel tank capacity4.5 US gal. 17 ltr.

Performance

Climbing ability30 degrees

Braking distance36 ft. @ 31 mph 11 M @ 50 kph

Minimum turning radius98.4 in. 2,500 mm

Engine

TypeDOHC 4 cylinder, transverse in-line

4 stroke air-cooled

Bore and stroke2.6 x 2.6 in. 66 x 66 mm

Displacement55.1 cui.in.903 cc

Compression ratio8.5:1

Max horsepower81 HP @ 8,500 rpm

Max torque52.8 ft-lb @7,500 rpm 7.3 kg-M @7,500 rpm

Valve timing:

INLETOpen30 degrees BTDC

Close70 degree ABDC

EXHAUSTOpen70 degree BBDC

Close30 degree ATDC

CarburetorsMikuni VM26SS x 4

Lubrication SystemForced lubrication

Engine oilSE Class SAE 10W40

Engine oil capactity: Less filter3.2 US pt.3.0 ltr.

Total incl. filter3.9 US qt.3.7 ltr.

Starting systemElectric & kick

Ignition systemBattery & coil

Ignition timingFrom 20 degrees BTDC @ 1,500 rpm to 40 degrees

BTDC @ 2,350 rpm

Spark PlugsNGK B8ES

Transmission

Type5-speed, constant-mesh, return-shift

ClutchWet, multi-disc.

Gear ratio1st3.17 (38/12)

2nd2.19 (35/16)

3rd1.67 (35/21)

4th1.38 (29/21)

5th1.22 (28/23)

Primary reduction ratio1.73 (97/56)

Final reduction ration US4.92 (5th)

Euro4.64 (5th)

Electrical Equipment

GeneratorKokusan AR3703

RegulatorKokusan RS2127

BatteryToyodenso ZC001-14, ZC001-23

StarterMitsuba SM-226-K

Head lamp typeUSSealed-beam

EuroSemi-sealed

Tail/Brake lampUS12V 3/32 c.p. 8/23W

Euro12V 5/21W

Speedometer lamp12V 3.4W

Tachometer lamp12V 3.4W

Neutral indicator lamp12V 3.4W

Turn signal lampsUS12V 23W x 4

Euro12V 21W x 4

Turn signal indicator lamp12V 3.4W

Oil Pressure indicator lamp12V 3.4W

Brake lamp failure indicator lamp12V 3.4W

City lamp (only Euro model)12V 4W

Horn12V 2.5A max.

Frame

TypeTubular, double-cradle

Steering anle41 degrees to either side

Castor64 degrees

Trail3.54 in. 90 mm

Tire sizeFront3.25H-19 4PR

Rear4.00H-18 4PR

SuspensionFrontTelescopic fork

RearSwing arm

Suspension strokeFront5.51 in.140 mm

Rear3.15 in.80 mm

Front fork oil capacity (each fork)5.9 oz. (US)175 cc

Front fork oil typeSAE 10W, non-detergent

Brakes:FrontDisc brake

RearInternal expansion, leading-trailing

Effective disc diameter9.6 in. 245 mm

Rear brake drum inside diameter7.9 x 1.4 in.200 x 35 mm

OTHER ADJUSTMENT / MAINTENANCE SPECS

Throttle valve clearance (for mechanical carb sync).024 - .028 in..6 - .7 mm

Idle speed800 - 1000 rpm

Clutch lever freeplay1/16 - 1/8 in.2 - 3 mm

Spark plug gap.028 - .031 in..7 - .8 mm

Contact breaker points gap.012 - .016 in..3 - .4 mm

Valve lifter clearance (after 500 mi. then every 4,000 mi).002 - .004 in..05 - 1.0 mm

Cam Chain adjust (after 500 mi then every 2,000 mi)

Front brake lever freeplay> 3/16 in.> 5 mm

Drive chain freeplay1 1/4 in.30 - 35 mm

Piston to pin clearance.00026 - .00057 in..0066 - .0145 mm

Piston pin to small end clearance.00012 - .00079 in..003 - .020 mm

Camshaft heightintake1.4276 - 1.4307 in.36.26 - 36.34 mm

intake service limit1.4236 in.36.16 mm

exhaust1.4079 - 1.4110 in.35.76 - 35.84 mm

exhaust service limit1.4039 in.35.66 mm

Camshaft/Bushing clearance.0008 - .0025 in..020 - .064 mm

service limit.0063 in. .16 mm

Cylinder head warp< .002 in. < .05 mm

service limit.010 in..25 mm

Cylinder inside diameter(standard)2.5984 - 2.5992 in.66.000 - 66.019 mm

service limit2.602 in.66.10 mm

Piston diameter(standard)2.5956 - 2.5965 in65.93 - 65.95 mm

service limit2.59 in.65.80 mm

Piston / Cylinder clearance.0025 - .003 in.060 - .079 mm

Piston ring thicknesstop ring (standard).0567 - .0575 in.1.440 - 1.455 mm

service limit.0535 in.1.36 mm

second ring (standard).0579 - .0587 in.1.470 - 1.490 mm

service limit.055 in.1.4 mm

Oil ring.0973 - .098 in.2.470 - 2.490 mm

service limit.0945 in.2.4 mm

Piston groove widthtop groove.059 - .060 in.1.5 - 1.52 mm

service limit.063 in.1.6 mm

second groove.059 - .060 in.1.5 - 1.52 mm

service limit.063 in.1.6 mm

bottom groove.098 - .099 in.2.5 - 2.52 mm

service limite.102 in.2.6 mm

Piston ring end gap.008 - .016 in..2 - .4 mm

service limit.028 in..7 mm

Clutch friction plate thickness.146 - .154 in.3.7 - 3.9 mm

service limite1.34 in.3.4 mm

Oil change / filter(after 500 miles then every 2,000 mi)

Front brake disc thickness.276 in.6.9 - 7.1 mm

service limit.217 in.6 mm

Rear brake lining thickness.1909 - .2146 in.4.85 - 5.45 mm

service limit.079 in.2 mm

Rectifier voltage limit14 - 15 V @ 4,000 rpm w/no lights on

Ignition coilsPrimary Impedence (test points red/yellow wire and black or green wire

depending on coil)3.2 - 4.2 ohms

Secondary Impedence (between two spark plug wires)

30K ohms

Carb Specs

(Z1 1973-1975 models)

VM28SC

Main jet112.5

Air jet1.0

Neele JetP-8

Jet needle5J9-3 (C-clip on 3rd groove)

Pilot jet20

Throttle Valve Cutaway2.5

Air screw1 1/2 turns out

Fuel level1.26 +/- .04 in. 32 +/- 1 mm

(KZ900 1976-1977 models)

VM26SS

Main jet115R

Air jet1.6

Needle Jeto-6

Jet needle5DL31-3 (C-clip on 3rd groove)

Pilot Jet17.5

Throttle valve cutaway1.5

Air screw1 3/8 turns out

Fuel level1.26 +/- .04 in. 32 +/- mm

Service fuel level3 +/- mm

Maintenance Chart - (will skip initial/subsequent frequencies as older bikes have passed this point)

Change engine oil2,000 mi.

Replace oil filter element4,000 mi.

Adjust brakes2,000 mi.

Adjust drive chain2,000 mi.

Check, adjust clutch2,000 mi.

Check, adjust carburetors2,000 mi.

Check spoke tightness and rim runout2,000 mi.

Tighten nuts and bolts2,000 mi.

Clean fuel system2,000 mi.

Clean, set spark plug gaps2,000 mi.

Adjust camshaft chain2,000 mi.

Check steering play2,000 mi.

Check valve lifter clearance4,000 mi.

Adjust points, check timing4,000 mi.

Clean air cleaner element2,000 mi.

Carry out general lubrication2,000 mi.

Check tire wear2,000 mi.

Check drive chain wear2,000 mi.

Lubricate drive chain 500 mi.

Check brake wear4,000 mi.

Check front fork oil level4,000 mi.

Change air cleaner element 6,000 mi.

Change front fork oil6,000 mi.

Change brake fluidYearly or 6,000 mi.

Regrease whell bearings Every 2 years or 12,000 mi.

Regrease speedometer gear boxEvery 2 years or 12,000 mi.

Regrease brake camshaftEvery 2 years or 12,000 mi.

Lubricate steering stem bearingsEvery 2 years or 12,000 mi.